By Terrill Yang (Github: https://github.com/yttty)
上一次我们写了一个简陋的勉强能运行的爬虫alpha. alpha版有很多问题. 比如一个网站上不了, 爬虫却一直在等待连接返回response, 不知道超时跳过; 或者有的网站专门拦截爬虫程序, 我们的爬虫也不会伪装自己成为浏览器正规部队; 并且抓取的内容没有保存到本地, 没有什么作用. 这次我们一个个解决这些小问题.
此外, 如果你对http的get和post以及response这些名词一无所知, 请先参考 <<计算机网络--自顶向下方法>> 这本书的第二章的大部分内容.
在看的过程中, 安装一个叫做 Fiddler 的软件, 边学边实践, 观察浏览器是如何访问一个网站的, 如何发出请求, 如何处理响应, 如何进行跳转, 甚至如何通过登录认证. 有句话说得好, 越会用Fiddler, 就对理论理解更深刻; 越对理论理解深刻, Fiddler就用得越顺手. 最后我们在用爬虫去做各种各样的事情的时候, Fiddler总是最得力的助手之一.
下面就是我们上一次写的爬虫alpha版本。
In [ ]:
import re
import urllib.request
import urllib
from collections import deque
queue = deque()
visited = set()
url = 'http://news.dbanotes.net' # 入口页面, 可以换成别的
queue.append(url)
cnt = 0
while queue:
url = queue.popleft() # 队首元素出队
visited |= {url} # 标记为已访问
print('已经抓取: ' + str(cnt) + ' 正在抓取 <--- ' + url)
cnt += 1
urlop = urllib.request.urlopen(url)
if 'html' not in urlop.getheader('Content-Type'):
continue
# 避免程序异常中止, 用try..catch处理异常
try:
data = urlop.read().decode('utf-8')
except:
continue
# 正则表达式提取页面中所有队列, 并判断是否已经访问过, 然后加入待爬队列
linkre = re.compile('href="(.+?)"')
for x in linkre.findall(data):
if 'http' in x and x not in visited:
queue.append(x)
print('加入队列 ---> ' + x)
在爬 http://baidu.com 的时候, 爬回来一个没有什么内容的东西, 这个东西告诉我们应该跳转到 http://www.baidu.com . 但是我们的爬虫并不支持自动跳转, 现在我们来加上这个功能, 让爬虫在爬 baidu.com 的时候能够抓取 www.baidu.com 的内容.
首先我们要知道爬 http://baidu.com 的时候他返回的页面是怎么样的, 这个我们既可以用 Fiddler 看, 也可以写一个小爬虫来抓取. 这里我抓到的内容如下, 你也应该尝试一下写几行 python 来抓一抓.
<html>
<meta http-equiv="refresh" content="0;url=http://www.baidu.com/">
</html>
看代码我们知道这是一个利用 html 的 meta 来刷新与重定向的代码, 其中的0是等待0秒后跳转, 也就是立即跳转. 这样我们再像上一次说的那样用一个正则表达式把这个url提取出来就可以爬到正确的地方去了. 其实我们上一次写的爬虫已经可以具有这个功能, 这里只是单独拿出来说明一下 http 的 meta 跳转.
现在我们详细研究一下如何让网站们把我们的Python爬虫当成正规的浏览器来访. 因为如果不这么伪装自己, 有的网站就爬不回来了. 如果看过理论方面的知识, 就知道我们是要在 GET 的时候将 User-Agent 添加到header里.
如果没有看过理论知识, 按照以下关键字搜索学习吧 :D
我用 IE 浏览器访问百度首页的时候, 浏览器发出去的请求报文如下:
GET http://www.baidu.com/ HTTP/1.1
Accept: text/html, application/xhtml+xml, */*
Accept-Language: en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
Accept-Encoding: gzip, deflate
Host: www.baidu.com
DNT: 1
Connection: Keep-Alive
Cookie: BAIDUID=57F4D171573A6B88A68789EF5DDFE87:FG=1; uc_login_unique=ccba6e8d978872d57c7654130e714abd; BD_UPN=11263145; BD然后百度收到这个消息后, 返回给我的的响应报文如下(有删节):
HTTP/1.1 200 OK
Date: Mon, 29 Sep 2014 13:07:01 GMT
Content-Type: text/html; charset=utf-8
Connection: Keep-Alive
Vary: Accept-Encoding
Cache-Control: private
Cxy_all: baidu+8b13ba5a7289a37fb380e0324ad688e7
Expires: Mon, 29 Sep 2014 13:06:21 GMT
X-Powered-By: HPHP
Server: BWS/1.1
BDPAGETYPE: 1
BDQID: 0x8d15bb610001fe79
BDUSERID: 0
Set-Cookie: BDSVRTM=0; path=/
Set-Cookie: BD_HOME=0; path=/
Content-Length: 80137
<!DOCTYPE html><!--STATUS OK--><html><head><meta http-equiv="content-type" content="text/html;charset=utf-8"><meta http-equiv="X-UA-Compatible" content="IE=Edge"><link rel="dns-prefetch" href="//s1.bdstatic.com"/><link rel="dns-prefetch" href="//t1.baidu.com"/><link rel="dns-prefetch" href="//t2.baidu.com"/><link rel="dns-prefetch" href="//t3.baidu.com"/><link rel="dns-prefetch" href="//t10.baidu.com"/><link rel="dns-prefetch" href="//t11.baidu.com"/><link rel="dns-prefetch" href="//t12.baidu.com"/><link rel="dns-prefetch" href="//b1.bdstatic.com"/><title>百度一下，你就知道</title><style index="index" > ..........这里省略两万字................ </script></body></html>如果能够看懂这段话的第一句就OK了, 别的可以以后再配合 Fiddler 慢慢研究. 所以我们要做的就是在 Python 爬虫向百度发起请求的时候, 顺便在请求里面写上 User-Agent, 表明自己是浏览器君.
在 GET 的时候添加 header 有很多方法, 下面介绍两种方法.
第一种方法比较简便直接, 但是不好扩展功能, 代码如下:
In [1]:
import urllib.request
url = 'http://www.baidu.com/'
req = urllib.request.Request(url, headers = {
'Connection': 'Keep-Alive',
'Accept': 'text/html, application/xhtml+xml, */*',
'Accept-Language': 'en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3',
'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko'
})
oper = urllib.request.urlopen(req)
data = oper.read()
print(data.decode())
<!DOCTYPE html>
<!--STATUS OK-->
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
<meta content="always" name="referrer">
<meta name="theme-color" content="#2932e1">
<link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
<link rel="search" type="application/opensearchdescription+xml" href="/content-search.xml" title="百度搜索" />
<link rel="icon" sizes="any" mask href="//www.baidu.com/img/baidu.svg">
<link rel="dns-prefetch" href="//s1.bdstatic.com"/>
<link rel="dns-prefetch" href="//t1.baidu.com"/>
<link rel="dns-prefetch" href="//t2.baidu.com"/>
<link rel="dns-prefetch" href="//t3.baidu.com"/>
<link rel="dns-prefetch" href="//t10.baidu.com"/>
<link rel="dns-prefetch" href="//t11.baidu.com"/>
<link rel="dns-prefetch" href="//t12.baidu.com"/>
<link rel="dns-prefetch" href="//b1.bdstatic.com"/>
<title>百度一下，你就知道</title>
<style id="css_index" index="index" type="text/css">html,body{height:100%}
html{overflow-y:auto}
body{font:12px arial;text-align:;background:#fff}
body,p,form,ul,li{margin:0;padding:0;list-style:none}
body,form,#fm{position:relative}
td{text-align:left}
img{border:0}
a{color:#00c}
a:active{color:#f60}
input{border:0;padding:0}
#wrapper{position:relative;_position:;min-height:100%}
#head{padding-bottom:100px;text-align:center;*z-index:1}
#ftCon{height:50px;position:absolute;bottom:47px;text-align:left;width:100%;margin:0 auto;z-index:0;overflow:hidden}
.ftCon-Wrapper{overflow:hidden;margin:0 auto;text-align:center;*width:640px}
.qrcodeCon{text-align:center;position:absolute;bottom:140px;height:60px;width:100%}
#qrcode{display:inline-block;*float:left;*margin-top:4px}
#qrcode .qrcode-item{float:left}
#qrcode .qrcode-item-2{margin-left:33px}
#qrcode .qrcode-img{width:60px;height:60px}
#qrcode .qrcode-item-1 .qrcode-img{background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/qrcode/zbios_efde696.png) 0 0 no-repeat}
#qrcode .qrcode-item-2 .qrcode-img{background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/qrcode/nuomi_365eabd.png) 0 0 no-repeat}
@media only screen and (-webkit-min-device-pixel-ratio:2){#qrcode .qrcode-item-1 .qrcode-img{background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/qrcode/zbios_x2_9d645d9.png);background-size:60px 60px}
#qrcode .qrcode-item-2 .qrcode-img{background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/qrcode/nuomi_x2_55dc5b7.png);background-size:60px 60px}}
#qrcode .qrcode-text{color:#999;line-height:23px;margin:3px 0 0 5px}
#qrcode .qrcode-text a{color:#999;text-decoration:none}
#qrcode .qrcode-text p{text-align:left}
#qrcode .qrcode-text b{color:#666;font-weight:700}
#qrcode .qrcode-text span{letter-spacing:1px}
#ftConw{display:inline-block;text-align:left;margin-left:33px;line-height:22px;position:relative;top:-2px;*float:right;*margin-left:0;*position:static}
#ftConw,#ftConw a{color:#999}
#ftConw{text-align:center;margin-left:0}
.bg{background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/icons_5859e57.png);background-repeat:no-repeat;_background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/icons_d5b04cc.gif)}
.c-icon{display:inline-block;width:14px;height:14px;vertical-align:text-bottom;font-style:normal;overflow:hidden;background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/icons_5859e57.png) no-repeat 0 0;_background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/icons_d5b04cc.gif)}
.c-icon-triangle-down-blue{background-position:-480px -168px}
.c-icon-chevron-unfold2{background-position:-504px -168px}
#m{width:720px;margin:0 auto}
#nv a,#nv b,.btn,#lk{font-size:14px}
#nv{height:19px;font-size:16px;margin:0 0 4px;text-align:left;text-indent:137px}
.s_btn{width:95px;height:32px;padding-top:2px\9;font-size:14px;background-color:#ddd;background-position:0 -48px;cursor:pointer}
.s_btn_h{background-position:-240px -48px}
.s_btn_wr{width:97px;height:34px;display:inline-block;background-position:-120px -48px;*position:relative;z-index:0;vertical-align:top}
#jgwab{margin-left:19px}
#cp .c-icon-icrlogo,.c-icon-jgwablogo{width:14px;height:17px;display:inline-block;overflow:hidden;background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/icons_5859e57.png) no-repeat;_background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/icons_d5b04cc.gif)}
#cp .c-icon-icrlogo{background-position:-600px -96px;position:relative;top:3px}
.c-icon-jgwablogo{background-position:-623px -96px;position:relative;top:3px}
#shouji{margin-right:14px}
#u{display:none}
#c-tips-container{display:none}
#wrapper{min-width:810px;height:100%;min-height:600px}
#head{position:relative;padding-bottom:0;height:100%;min-height:600px}
#head .head_wrapper{height:100%}
#m{position:relative}
#fm{padding-left:40px;top:-37px}
#lh a{margin-left:62px}
#lh #seth,#lh #setf{margin-left:0}
#lk{position:absolute;display:none;top:0;right:0;margin:33px 0}
#lk span{font:14px "宋体"}
#nv{position:absolute;display:none;top:0;right:0}
#lm{color:#666;width:100%;height:60px;margin-top:60px;line-height:15px;font-size:13px;position:absolute;top:0;left:0}
#lm a{color:#666}
#pad-version{line-height:40px}
.s_ipt_wr.bg,.s_btn_wr.bg,#su.bg{background-image:none}
.s_btn_wr{width:auto;height:auto;border-bottom:1px solid transparent;*border-bottom:0}
.s_btn{width:100px;height:36px;color:#fff;font-size:15px;letter-spacing:1px;background:#3385ff;border-bottom:1px solid #2d78f4;outline:medium;*border-bottom:0;-webkit-appearance:none;-webkit-border-radius:0}
.s_btn.btnhover{background:#317ef3;border-bottom:1px solid #2868c8;*border-bottom:0;box-shadow:1px 1px 1px #ccc}
.s_btn_h{background:#3075dc;box-shadow:inset 1px 1px 5px #2964bb;-webkit-box-shadow:inset 1px 1px 5px #2964bb;-moz-box-shadow:inset 1px 1px 5px #2964bb;-o-box-shadow:inset 1px 1px 5px #2964bb}
#result_logo{display:none}
#index_logo img{display:inline-block;width:270px;height:129px}
#s_tab{display:none}
.s_form{position:relative;top:38.2%}
.s_form_wrapper{position:relative;top:-191px}
.s_ipt_wr{height:34px}
#head .c-icon-bear-round{display:none}
#form{margin:22px auto 0;width:641px;text-align:left;z-index:100}
#form .bdsug,#fm .bdsug{top:35px}
.bdsug{display:none;position:absolute;width:538px;background:#fff;border:1px solid #ccc;_overflow:hidden;box-shadow:1px 1px 3px #ededed;-webkit-box-shadow:1px 1px 3px #ededed;-moz-box-shadow:1px 1px 3px #ededed;-o-box-shadow:1px 1px 3px #ededed}
.bdsug.bdsugbg ul{background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/sugbg_1762fe7.png) 100% 100% no-repeat;background-size:100px 110px;background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/sugbg_90fc9cf.gif)\9}
.bdsug li{width:522px;color:#000;font:14px arial;line-height:25px;padding:0 8px;position:relative;cursor:default}
.bdsug li.bdsug-s{background:#f0f0f0}
.bdsug-store span,.bdsug-store b{color:#7A77C8}
.bdsug-store-del{font-size:12px;color:#666;text-decoration:underline;position:absolute;right:8px;top:0;cursor:pointer;display:none}
.bdsug-s .bdsug-store-del{display:inline-block}
.bdsug-ala{display:inline-block;border-bottom:1px solid #e6e6e6}
.bdsug-ala h3{line-height:14px;background:url(//www.baidu.com/img/sug_bd.png) no-repeat left center;margin:8px 0 5px;font-size:12px;font-weight:400;color:#7B7B7B;padding-left:20px}
.bdsug-ala p{font-size:14px;font-weight:700;padding-left:20px}
.bdsug .bdsug-direct{width:auto;padding:0;border-bottom:1px solid #f1f1f1}
.bdsug .bdsug-direct p{color:#00c;font-weight:700;line-height:34px;padding:0 8px;cursor:pointer;white-space:nowrap;overflow:hidden}
.bdsug .bdsug-direct p img{width:16px;height:16px;margin:7px 6px 9px 0;vertical-align:middle}
.bdsug .bdsug-direct p span{margin-left:8px}
.bdsug .bdsug-direct p i{font-size:12px;line-height:100%;font-style:normal;font-weight:400;color:#fff;background-color:#2b99ff;display:inline;text-align:center;padding:1px 5px;*padding:2px 5px 0;margin-left:8px;overflow:hidden}
.bdsug .bdsug-pcDirect{color:#000;font-size:14px;line-height:30px;height:30px;background-color:#f8f8f8}
.bdsug .bdsug-pc-direct-tip{position:absolute;right:15px;top:8px;width:55px;height:15px;display:block;background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/pc_direct_42d6311.png) no-repeat 0 0}
.bdsug li.bdsug-pcDirect-s{background-color:#f0f0f0}
.bdsug .bdsug-pcDirect-is{color:#000;font-size:14px;line-height:22px;background-color:#f8f8f8}
.bdsug .bdsug-pc-direct-tip-is{position:absolute;right:15px;top:3px;width:55px;height:15px;display:block;background:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/img/pc_direct_42d6311.png) no-repeat 0 0}
.bdsug li.bdsug-pcDirect-is-s{background-color:#f0f0f0}
.bdsug .bdsug-pcDirect-s .bdsug-pc-direct-tip,.bdsug .bdsug-pcDirect-is-s .bdsug-pc-direct-tip-is{background-position:0 -15px}
.bdsug .bdsug-newicon{color:#929292;opacity:.7;font-size:12px;display:inline-block;line-height:22px;letter-spacing:2px}
.bdsug .bdsug-s .bdsug-newicon{opacity:1}
.bdsug .bdsug-newicon i{letter-spacing:0;font-style:normal}
.toggle-underline{text-decoration:none}
.toggle-underline:hover{text-decoration:underline}
.tools{position:absolute;right:-75px}
#mHolder{width:62px;position:relative;z-index:296;display:none}
#mCon{height:18px;line-height:18px;position:absolute;cursor:pointer}
#mCon span{color:#00c;display:block;width:24px}
#mCon .hw{text-decoration:underline;cursor:pointer;display:inline-block}
#mCon .pinyin{display:inline-block}
#mCon .c-icon-chevron-unfold2{margin-left:5px}
#mMenu a{width:100%;height:100%;display:block;line-height:22px;text-indent:6px;text-decoration:none;filter:none\9}
#mMenu,#user ul{box-shadow:1px 1px 2px #ccc;-moz-box-shadow:1px 1px 2px #ccc;-webkit-box-shadow:1px 1px 2px #ccc;filter:progid:DXImageTransform.Microsoft.Shadow(Strength=2, Direction=135, Color=#cccccc)\9}
#mMenu{width:56px;border:1px solid #9b9b9b;list-style:none;position:absolute;right:27px;top:28px;display:none;background:#fff}
#mMenu a:hover{background:#ebebeb}
#mMenu .ln{height:1px;background:#ebebeb;overflow:hidden;font-size:1px;line-height:1px;margin-top:-1px}
#u1 a:link,#u1 a:visited{color:#666;text-decoration:none}
#u1 a:hover,#u1 a:active{text-decoration:underline}
#u1 a:active{color:#00c}
#u1{z-index:2;color:#fff;position:absolute;right:0;top:0;margin:19px 0 5px;padding:0 96px 0 0}
#u1 .reg{display:none}
#u1 a.pf,#u1 a.pf:visited{display:inline-block;float:left;color:#333;line-height:24px;font-size:13px;margin-left:20px;overflow:hidden;text-decoration:underline}
#u1 a.lb,#u1 a.lb:visited,#u1 a.username{display:inline-block;float:left;color:#333;font-size:13px;line-height:24px;margin-left:20px;text-decoration:underline}
#u1 a.bri,#u1 a.bri:visited{display:inline-block;position:absolute;right:10px;width:60px;height:23px;float:left;color:#fff;background:#38f;line-height:24px;font-size:13px;text-align:center;overflow:hidden;border-bottom:1px solid #38f;margin-left:19px;margin-right:2px}
#u1 a.bri.brihover{display:none;text-decoration:none;color:#333;background:0 0;border-bottom:1px solid transparent;margin-left:19px}
#u1 #lm a{color:#00c;text-decoration:underline}
#u1 a.mnav,#u1 a.mnav:visited{float:left;color:#333;font-weight:700;line-height:24px;margin-left:20px;font-size:13px;text-decoration:underline}
#u1 a.pf:hover,#u1 a.lb:hover,#u1 a.mnav:hover{color:#00c}
.briiconsbg{background-repeat:no-repeat;background-size:300px 18px;background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/icons_0c37e9b.png);background-image:url(https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/home/img/icons_809ae65.gif)\9}
.bdpfmenu{background-color:#fff;border:1px solid #d1d1d1;position:absolute;right:160px;width:68px;top:36px;margin-top:-1px;_margin-top:-3px;z-index:2;box-shadow:1px 1px 5px #d1d1d1;-webkit-box-shadow:1px 1px 5px #d1d1d1;-moz-box-shadow:1px 1px 5px #d1d1d1;-o-box-shadow:1px 1px 5px #d1d1d1}
.bdpfmenu a{display:block;text-align:left;margin:0!important;padding:0 9px;line-height:26px;text-decoration:none}
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#wrapper .bdnuarrow em{border-bottom-color:#d8d8d8;top:-1px}
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input::-ms-clear{display:none}
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function h(obj){
obj.style.behavior='url(#default#homepage)';
var a = obj.setHomePage('//www.baidu.com/');
}
</script>
<noscript>
<meta http-equiv="refresh" content="0; url=/baidu.html?from=noscript"/>
</noscript>
<script>window._ASYNC_START=new Date().getTime();</script>
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<body link="#0000cc">
<script>
if (/Chrome\/37.0.2062.94/i.test(navigator.userAgent) && (/(windows 7)|(windows nt 6.1)/i.test(navigator.userAgent))) {
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<div id="wrapper" style="display:none;">
<script>if(window.bds&&bds.util&&bds.util.setContainerWidth){bds.util.setContainerWidth();}</script><div id="head"><div class="head_wrapper"><div class="s_form"><div class="s_form_wrapper"><div id="lg"><img hidefocus="true" src="//www.baidu.com/img/bd_logo1.png" width="270" height="129"></div><a href="/" id="result_logo" onmousedown="return c({'fm':'tab','tab':'logo'})"><img src="//www.baidu.com/img/baidu_jgylogo3.gif" alt="到百度首页" title="到百度首页"></a><form id="form" name="f" action="/s" class="fm"><input type="hidden" name="ie" value="utf-8"><input type="hidden" name="f" value="8"><input type="hidden" name="rsv_bp" value="1"><input type="hidden" name="rsv_idx" value="1"><input type=hidden name=ch value=""><input type=hidden name=tn value="baidu"><input type=hidden name=bar value=""><span class="bg s_ipt_wr"><input id="kw" name="wd" class="s_ipt" value="" maxlength="255" autocomplete="off"></span><span class="bg s_btn_wr"><input type="submit" id="su" value="百度一下" class="bg s_btn"></span><span class="tools"><span id="mHolder"><div id="mCon"><span>输入法</span></div><ul id="mMenu"><li><a href="javascript:;" name="ime_hw">手写</a></li><li><a href="javascript:;" name="ime_py">拼音</a></li><li class="ln"></li><li><a href="javascript:;" name="ime_cl">关闭</a></li></ul></span></span><input type="hidden" name="rn" value=""><input type="hidden" name="oq" value=""><input type="hidden" name="rsv_pq" value="f62f926400036d25"><input type="hidden" name="rsv_t" value="7068I17JfWpS+6HeDXfteD5U/RyNr9ceFvEPNl8009jVxCz/pZfhQrOs8tY"><input type="hidden" name="rqlang" value="cn"></form><div id="m"></div></div></div><div id="u"><a class="toindex" href="/">百度首页</a><a href="javascript:;" name="tj_settingicon" class="pf">设置<i class="c-icon c-icon-triangle-down"></i></a><a href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" name="tj_login" class="lb" onclick="return false;">登录</a></div><div id="u1"><a href="http://www.nuomi.com/?cid=002540" name="tj_trnuomi" class="mnav">糯米</a><a href="http://news.baidu.com" name="tj_trnews" class="mnav">新闻</a><a href="http://www.hao123.com" name="tj_trhao123" class="mnav">hao123</a><a href="http://map.baidu.com" name="tj_trmap" class="mnav">地图</a><a href="http://v.baidu.com" name="tj_trvideo" class="mnav">视频</a><a href="http://tieba.baidu.com" name="tj_trtieba" class="mnav">贴吧</a><a href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" name="tj_login" class="lb" onclick="return false;">登录</a><a href="http://www.baidu.com/gaoji/preferences.html" name="tj_settingicon" class="pf">设置</a><a href="http://www.baidu.com/more/" name="tj_briicon" class="bri" style="display: block;">更多产品</a></div></div></div>
<div class="s_tab" id="s_tab">
<b>网页</b><a href="http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'news'})">新闻</a><a href="http://tieba.baidu.com/f?kw=&fr=wwwt" wdfield="kw" onmousedown="return c({'fm':'tab','tab':'tieba'})">贴吧</a><a href="http://zhidao.baidu.com/q?ct=17&pn=0&tn=ikaslist&rn=10&word=&fr=wwwt" wdfield="word" onmousedown="return c({'fm':'tab','tab':'zhidao'})">知道</a><a href="http://music.baidu.com/search?fr=ps&ie=utf-8&key=" wdfield="key" onmousedown="return c({'fm':'tab','tab':'music'})">音乐</a><a href="http://image.baidu.com/search/index?tn=baiduimage&ps=1&ct=201326592&lm=-1&cl=2&nc=1&ie=utf-8&word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'pic'})">图片</a><a href="http://v.baidu.com/v?ct=301989888&rn=20&pn=0&db=0&s=25&ie=utf-8&word=" wdfield="word" onmousedown="return c({'fm':'tab','tab':'video'})">视频</a><a href="http://map.baidu.com/m?word=&fr=ps01000" wdfield="word" onmousedown="return c({'fm':'tab','tab':'map'})">地图</a><a href="http://wenku.baidu.com/search?word=&lm=0&od=0&ie=utf-8" wdfield="word" onmousedown="return c({'fm':'tab','tab':'wenku'})">文库</a><a href="//www.baidu.com/more/" onmousedown="return c({'fm':'tab','tab':'more'})">更多»</a>
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<div class="qrcodeCon">
<div id="qrcode">
<div class="qrcode-item qrcode-item-1">
<div class="qrcode-img"></div>
<div class="qrcode-text">
<p><b>手机百度</b></p>
</div>
</div>
</div>
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<div id="ftCon">
<div class="ftCon-Wrapper"><div id="ftConw"><p id="lh"><a id="setf" href="//www.baidu.com/cache/sethelp/help.html" onmousedown="return ns_c({'fm':'behs','tab':'favorites','pos':0})" target="_blank">把百度设为主页</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about'})" href="http://home.baidu.com">关于百度</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_about_en'})" href="http://ir.baidu.com">About Baidu</a><a onmousedown="return ns_c({'fm':'behs','tab':'tj_tuiguang'})" href="http://e.baidu.com/?refer=888">百度推广</a></p><p id="cp">©2017 Baidu <a href="http://www.baidu.com/duty/" onmousedown="return ns_c({'fm':'behs','tab':'tj_duty'})">使用百度前必读</a> <a href="http://jianyi.baidu.com/" class="cp-feedback" onmousedown="return ns_c({'fm':'behs','tab':'tj_homefb'})">意见反馈</a> 京ICP证030173号 <i class="c-icon-icrlogo"></i> <a id="jgwab" target="_blank" href="http://www.beian.gov.cn/portal/registerSystemInfo?recordcode=11000002000001">京公网安备11000002000001号</a> <i class="c-icon-jgwablogo"></i></p></div></div></div>
<div id="wrapper_wrapper">
</div>
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<div class="c-tips-container" id="c-tips-container"></div>
<script>
window.__async_strategy=2;
//window.__switch_add_mask=false;
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<script>
var bds={
se:{},
su:{
urdata:[],
urSendClick:function(){}
},
util:{},
use:{},
comm : {
domain:"http://www.baidu.com",
ubsurl : "https://sp0.baidu.com/5bU_dTmfKgQFm2e88IuM_a/w.gif",
tn:"baidu",
queryEnc:"",
queryId:"",
inter:"",
templateName:"",
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query : "",
qid : "f62f926400036d25",
cid : "0",
sid : "21871_1445_21123_21614_20927",
indexSid : "21871_1445_21123_21614_20927",
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username : "",
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pinyin : "",
favoOn : "",
cookie : null,
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protectNum:0,
zxlNum:0,
pageNum:1,
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maxPreloadTimes:10,
preloadMouseMoveDistance:5,
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ishome : 1,
flagTranslateResult:0,
globalLogFlag:0
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//防止从结果页打开的页面中通过opener.xxx来影响百度页面
var name,navigate,al_arr=[];
var selfOpen = window.open;eval("var open = selfOpen;");
var isIE=navigator.userAgent.indexOf("MSIE")!=-1&&!window.opera;
var E = bds.ecom= {};
bds.se.mon = {'loadedItems':[],'load':function(){},'srvt':-1};
try {
bds.se.mon.srvt = parseInt(document.cookie.match(new RegExp("(^| )BDSVRTM=([^;]*)(;|$)"))[2]);
document.cookie="BDSVRTM=;expires=Sat, 01 Jan 2000 00:00:00 GMT";
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var
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bdQuery = bds.comm.query,
bdUseFavo = bds.comm.useFavo,
bdFavoOn = bds.comm.favoOn,
bdCid = bds.comm.cid,
bdSid = bds.comm.sid,
bdServerTime = bds.comm.serverTime,
bdQid = bds.comm.queryId,
bdstoken = bds.comm.stoken,
login_success = [];
</script>
<script>
/* https域名转换工具 */
bds.util.domain = (function(){
var list = {
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"p.qiao.baidu.com":"https://sp0.baidu.com/5PoXdTebKgQFm2e88IuM_a",
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.c-dropdown2-btn-group{position:relative;height:24px;border:1px solid #999;border-bottom-color:#d8d8d8;border-right-color:#d8d8d8;-moz-user-select:none;-webkit-user-select:none;user-select:none}.c-dropdown2:hover .c-dropdown2-btn-group,.c-dropdown2-hover .c-dropdown2-btn-group{box-shadow:inset 1px 1px 0 0 #d8d8d8;-webkit-box-shadow:inset 1px 1px 0 0 #d8d8d8;-moz-box-shadow:inset 1px 1px 0 0 #d8d8d8;-o-box-shadow:inset 1px 1px 0 0 #d8d8d8}.c-dropdown2:hover .c-dropdown2-btn-icon,.c-dropdown2-hover .c-dropdown2-btn-icon{box-shadow:inset 0 1px 0 0 #d8d8d8;-webkit-box-shadow:inset 0 1px 0 0 #d8d8d8;-moz-box-shadow:inset 0 1px 0 0 #d8d8d8;-o-box-shadow:inset 0 1px 0 0 #d8d8d8}.c-dropdown2:hover .c-dropdown2-btn-icon-border,.c-dropdown2-hover .c-dropdown2-btn-icon-border{background-color:#f2f2f2}.c-dropdown2 .c-dropdown2-btn{height:24px;padding-left:10px;padding-right:10px;cursor:default;overflow:hidden;white-space:nowrap}.c-dropdown2 .c-dropdown2-btn-icon{position:absolute;top:0;right:0;width:23px;height:24px;line-height:24px;background-color:#fff;padding:0 1px 0 10px}.c-dropdown2 .c-dropdown2-btn-icon-border{height:24px;width:23px;border-left:1px solid #d9d9d9;text-align:center;zoom:1}.c-dropdown2 .c-icon-triangle-down{*margin-top:5px;_margin-left:2px}.c-dropdown2 .c-dropdown2-menu{position:absolute;left:0;top:100%;_margin-top:0;width:100%;overflow:hidden;border:1px solid #bbb;background:#fff;visibility:hidden}.c-dropdown2 .c-dropdown2-menu-inner{overflow:hidden}.c-dropdown2 .c-dropdown2-option{background-color:#fff;cursor:pointer}.c-dropdown2 .c-dropdown2-selected{background-color:#f5f5f5}.c-dropdown2-common ul,.c-dropdown2-common li{margin:0;padding:0;list-style:none}.c-dropdown2-common .c-dropdown2-option{height:26px;line-height:26px;font-size:12px;color:#333;white-space:nowrap;cursor:pointer;padding-left:10px}.c-dropdown2-common .c-dropdown2-selected{background-color:#f5f5f5}.c-dropdown2-common 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#999;border-bottom-color:#d8d8d8;border-right-color:#d8d8d8;outline:0;box-sizing:content-box;-webkit-box-sizing:content-box;-moz-box-sizing:content-box;vertical-align:top;overflow:hidden}.c-input:hover{box-shadow:inset 1px 1px 1px 0 #d8d8d8;-webkit-box-shadow:inset 1px 1px 1px 0 #d8d8d8;-moz-box-shadow:inset 1px 1px 1px 0 #d8d8d8;-o-box-shadow:inset 1px 1px 1px 0 #d8d8d8}.c-input .c-icon{float:right;margin-top:6px}.c-input .c-icon-left{float:left;margin-right:4px}.c-input input{float:left;height:22px;*padding-top:4px;margin-top:2px;font-size:13px;border:0;outline:0}.c-input{width:180px}.c-input input{width:162px}.c-input-xmini{width:65px}.c-input-xmini input{width:47px}.c-input-mini{width:88px}.c-input-mini input{width:70px}.c-input-small{width:157px}.c-input-small input{width:139px}.c-input-large{width:203px}.c-input-large input{width:185px}.c-input-xlarge{width:341px}.c-input-xlarge input{width:323px}.c-input12{width:249px}.c-input12 input{width:231px}.c-input20{width:433px}.c-input20 input{width:415px}.c-border .c-input{width:178px}.c-border .c-input input{width:160px}.c-border .c-input-xmini{width:68px}.c-border .c-input-xmini input{width:50px}.c-border .c-input-mini{width:90px}.c-border .c-input-mini input{width:72px}.c-border .c-input-small{width:156px}.c-border .c-input-small input{width:138px}.c-border .c-input-large{width:200px}.c-border .c-input-large input{width:182px}.c-border .c-input-xlarge{width:332px}.c-border .c-input-xlarge input{width:314px}.c-border .c-input12{width:244px}.c-border .c-input12 input{width:226px}.c-border .c-input20{width:420px}.c-border .c-input20 input{width:402px}.c-numberset{*zoom:1}.c-numberset:after{display:block;height:0;content:\"\";clear:both;visibility:hidden}.c-numberset li{float:left;margin-right:17px;list-style:none}.c-numberset .c-numberset-last{margin-right:0}.c-numberset a{display:block;width:50px;text-decoration:none;text-align:center;border:1px solid #d8d8d8;cursor:pointer}.c-numberset a:hover{border-color:#388bff}.c-border .c-numberset li{margin-right:10px}.c-border .c-numberset .c-numberset-last{margin-right:0}.c-border .c-numberset a{width:54px}.c-table{width:100%;border-collapse:collapse;border-spacing:0}.c-table th,.c-table td{padding-left:10px;line-height:1.54;font-size:13px;border-bottom:1px solid #f3f3f3;text-align:left}.cr-content .c-table th:first-child,.cr-content .c-table td:first-child{padding-left:0}.c-table th{padding-top:4px;padding-bottom:4px;font-weight:400;color:#666;border-color:#f0f0f0;white-space:nowrap;background-color:#fafafa}.c-table td{padding-top:6.5px;padding-bottom:6.5px}.c-table-hasimg td{padding-top:10px;padding-bottom:10px}.c-table a,.c-table em{text-decoration:none}.c-table a:hover,.c-table a:hover em{text-decoration:underline}.c-table a.c-icon:hover{text-decoration:none}.c-table .c-btn:hover,.c-table .c-btn:hover em{text-decoration:none}.c-table-nohihead th{background-color:transparent}.c-table-noborder td{border-bottom:0}.c-tabs-nav-movetop{margin:-10px -9px 0 -10px;position:relative}.c-tabs-nav{border-bottom:1px solid #d9d9d9;background-color:#fafafa;line-height:1.54;font-size:0;*zoom:1;_overflow-x:hidden;_position:relative}.c-tabs-nav:after{display:block;height:0;content:\"\";clear:both;visibility:hidden}.c-tabs-nav .c-tabs-nav-btn{float:right;_position:absolute;_top:0;_right:0;_z-index:1;background:#fafafa}.c-tabs-nav .c-tabs-nav-btn .c-tabs-nav-btn-prev,.c-tabs-nav .c-tabs-nav-btn .c-tabs-nav-btn-next{float:left;padding:6px 2px;cursor:pointer}.c-tabs-nav .c-tabs-nav-btn .c-tabs-nav-btn-disable{cursor:default}.c-tabs-nav .c-tabs-nav-view{_position:relative;overflow:hidden;*zoom:1;margin-bottom:-1px}.c-tabs-nav .c-tabs-nav-view .c-tabs-nav-li{margin-bottom:0}.c-tabs-nav .c-tabs-nav-more{float:left;white-space:nowrap}.c-tabs-nav li,.c-tabs-nav a{color:#666;font-size:13px;*zoom:1}.c-tabs-nav li{display:inline-block;margin-bottom:-1px;*display:inline;padding:3px 15px;vertical-align:bottom;border-style:solid;border-width:2px 1px 0;border-color:transparent;_border-color:tomato;_filter:chroma(color=#ff6347);list-style:none;cursor:pointer;white-space:nowrap;overflow:hidden}.c-tabs-nav a{text-decoration:none}.c-tabs-nav .c-tabs-nav-sep{height:16px;width:0;padding:0;margin-bottom:4px;border-style:solid;border-width:0 1px;border-color:transparent #fff transparent #dedede}.c-tabs-nav .c-tabs-nav-selected{_position:relative;border-color:#2c99ff #e4e4e4 #fff #dedede;background-color:#fff;color:#000;cursor:default}.c-tabs-nav-one .c-tabs-nav-selected{border-color:transparent;_border-color:tomato;_filter:chroma(color=#ff6347);background-color:transparent;color:#666}.c-tabs .c-tabs .c-tabs-nav{padding:10px 0 5px;border:0 0;background-color:#fff}.c-tabs .c-tabs .c-tabs-nav li,.c-tabs .c-tabs .c-tabs-nav a{color:#00c}.c-tabs .c-tabs .c-tabs-nav li{padding:0 5px;position:static;margin:0 10px;border:0 0;cursor:pointer;white-space:nowrap}.c-tabs .c-tabs .c-tabs-nav .c-tabs-nav-sep{height:11px;width:0;padding:0;margin:0 0 4px;border:0 0;border-left:1px solid #d8d8d8}.c-tabs .c-tabs .c-tabs-nav .c-tabs-nav-selected{background-color:#2c99ff;color:#fff;cursor:default}.c-tag{padding-top:3px;margin-bottom:3px;height:1.7em;font-size:13px;line-height:1.4em;transition:height .3s ease-in;-webkit-transition:height .3s ease-in;-moz-transition:height .3s ease-in;-ms-transition:height .3s ease-in;-o-transition:height .3s ease-in;*zoom:1;overflow:hidden}.c-tag:after{display:block;height:0;content:\"\";clear:both;visibility:hidden}.c-tag-cont{overflow:hidden;*zoom:1}.c-tag-type,.c-tag-li,.c-tag-more,.c-tag-cont span{margin:2px 0}.c-tag-type,.c-tag-li,.c-tag-cont span{float:left}.c-tag-type,.c-tag-more{color:#666}.c-tag-li,.c-tag-cont span{padding:0 4px;display:inline-block;margin-right:12px;white-space:nowrap;cursor:pointer;color:#00c}.c-tag .c-tag-selected{background:#388bff;color:#fff}.c-tag-more{float:right;background:#fff;cursor:pointer;*height:18px}.c-tool{display:inline-block;width:56px;height:56px;background:url(\/\/www.baidu.com\/aladdin\/img\/tools\/tools-5.png) no-repeat}.c-tool-region{background-position:0 0}.c-tool-calendar{background-position:-72px 0}.c-tool-city{background-position:-144px 0}.c-tool-phone-pos{background-position:-216px 0}.c-tool-other{background-position:-288px 0}.c-tool-midnight{background-position:-360px 0}.c-tool-kefu{width:121px;background-position:-432px 0}.c-tool-phone{background-position:-576px 0}.c-tool-car{background-position:-648px 0}.c-tool-station{background-position:0 -72px}.c-tool-cheat{background-position:-72px -72px}.c-tool-counter{background-position:-144px -72px}.c-tool-time{background-position:-216px -72px}.c-tool-zip{background-position:-288px -72px}.c-tool-warning{background-position:-360px -72px}.c-tool-ip{background-position:0 -144px}.c-tool-unit{background-position:-72px -144px}.c-tool-rate{background-position:-144px -144px}.c-tool-conversion{background-position:-288px -144px}.c-tool-ads{background-position:-360px -144px}.soutu-input{padding-left:55px!important}.soutu-input-image{position:absolute;left:1px;top:1px;height:28px;width:49px;z-index:1;padding:0;background:#e6e6e6;border:1px solid #e6e6e6}.soutu-input-thumb{height:28px;width:28px;min-width:1px}.soutu-input-close{position:absolute;right:0;top:0;cursor:pointer;display:block;width:22px;height:28px}.soutu-input-close::after{content:\" \";position:absolute;right:3px;top:50%;cursor:pointer;margin-top:-7px;display:block;width:14px;height:14px;background:url(https:\/\/ss1.bdstatic.com\/5eN1bjq8AAUYm2zgoY3K\/r\/www\/cache\/static\/protocol\/https\/soutu\/img\/soutu_icons_new_8abaf8a.png) no-repeat -163px 0}.soutu-input-image:hover .soutu-input-close::after{background-position:-215px 2px}<\/style>";
result_common_css=$(result_common_css);
result_common_css.attr("data-for","result");
var index_css= $('head [index]');
var wrapper=$("#wrapper");
window.index_on=function(){
index_css.insertAfter("meta:eq(0)");
result_common_css.remove();
wrapper.show();
if(bds.su&&bds.su.U&&bds.su.U.homeInit){
bds.su.U.homeInit();
}
//$("#wrapper_wrapper").remove();
};
window.index_off=function(){
//不能操作dom，只能改css，否则会丢失输入法状态
result_common_css.insertAfter("meta:eq(0)");
wrapper.show();
index_css.remove();
//$("<div id='wrapper_wrapper'></div>").appendTo("#wrapper");
};
})();
//首页UA diff 监控
$(window).on("load",function() {
var rand = Math.random();
if(rand < 0.01) {
try {
var baseUrl = "//www.baidu.com/nocache/fesplg/s.gif?log_type=hm&type=uamonitor&",
queryString = "";
queryString += "&c_ua=" + encodeURIComponent(navigator.userAgent);
queryString += "&s_ua=" + encodeURIComponent(bds.comm.userAgent);
var url=baseUrl+queryString,
img = new Image(),
img_rand="_LOG_"+new Date().getTime();
img.onload=function(){
delete window[img_rand];
};
window[img_rand]=img;
img.src=url;
} catch(e) {};
}
});
</script>
<script>window.__sam_his_nopredict=true;</script>
<script type="text/javascript">var Cookie={set:function(e,t,o,i,s,n){document.cookie=e+"="+(n?t:escape(t))+(s?"; expires="+s.toGMTString():"")+(i?"; path="+i:"; path=/")+(o?"; domain="+o:"")},get:function(e,t){var o=document.cookie.match(new RegExp("(^| )"+e+"=([^;]*)(;|$)"));return null!=o?unescape(o[2]):t},clear:function(e,t,o){this.get(e)&&(document.cookie=e+"="+(t?"; path="+t:"; path=/")+(o?"; domain="+o:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT")}};!function(){function save(e){var t=[];for(tmpName in options)options.hasOwnProperty(tmpName)&&"duRobotState"!==tmpName&&t.push('"'+tmpName+'":"'+options[tmpName]+'"');
var o="{"+t.join(",")+"}";bds.comm.personalData?$.ajax({url:"//www.baidu.com/ups/submit/addtips/?product=ps&tips="+encodeURIComponent(o)+"&_r="+(new Date).getTime(),success:function(){writeCookie(),"function"==typeof e&&e()}}):(writeCookie(),"function"==typeof e&&setTimeout(e,0))}function set(e,t){options[e]=t}function get(e){return options[e]}function writeCookie(){if(options.hasOwnProperty("sugSet")){var e="0"==options.sugSet?"0":"3";clearCookie("sug"),Cookie.set("sug",e,document.domain,"/",expire30y)
}if(options.hasOwnProperty("sugStoreSet")){var e=0==options.sugStoreSet?"0":"1";clearCookie("sugstore"),Cookie.set("sugstore",e,document.domain,"/",expire30y)}if(options.hasOwnProperty("isSwitch")){var t={0:"2",1:"0",2:"1"},e=t[options.isSwitch];clearCookie("ORIGIN"),Cookie.set("ORIGIN",e,document.domain,"/",expire30y)}if(options.hasOwnProperty("imeSwitch")){var e=options.imeSwitch;clearCookie("bdime"),Cookie.set("bdime",e,document.domain,"/",expire30y)}}function writeBAIDUID(){var e,t,o,i=Cookie.get("BAIDUID");
/FG=(\d+)/.test(i)&&(t=RegExp.$1),/SL=(\d+)/.test(i)&&(o=RegExp.$1),/NR=(\d+)/.test(i)&&(e=RegExp.$1),options.hasOwnProperty("resultNum")&&(e=options.resultNum),options.hasOwnProperty("resultLang")&&(o=options.resultLang),Cookie.set("BAIDUID",i.replace(/:.*$/,"")+("undefined"!=typeof o?":SL="+o:"")+("undefined"!=typeof e?":NR="+e:"")+("undefined"!=typeof t?":FG="+t:""),".baidu.com","/",expire30y,!0)}function clearCookie(e){Cookie.clear(e,"/"),Cookie.clear(e,"/",document.domain),Cookie.clear(e,"/","."+document.domain),Cookie.clear(e,"/",".baidu.com")
}function reset(e){options=defaultOptions,save(e)}var defaultOptions={sugSet:1,sugStoreSet:1,isSwitch:1,isJumpHttps:1,imeSwitch:0,resultNum:10,skinOpen:1,resultLang:0,duRobotState:"000"},options={},tmpName,expire30y=new Date;expire30y.setTime(expire30y.getTime()+94608e7);try{if(bds&&bds.comm&&bds.comm.personalData){if("string"==typeof bds.comm.personalData&&(bds.comm.personalData=eval("("+bds.comm.personalData+")")),!bds.comm.personalData)return;for(tmpName in bds.comm.personalData)defaultOptions.hasOwnProperty(tmpName)&&bds.comm.personalData.hasOwnProperty(tmpName)&&"SUCCESS"==bds.comm.personalData[tmpName].ErrMsg&&(options[tmpName]=bds.comm.personalData[tmpName].value)
}try{parseInt(options.resultNum)||delete options.resultNum,parseInt(options.resultLang)||"0"==options.resultLang||delete options.resultLang}catch(e){}writeCookie(),"sugSet"in options||(options.sugSet=3!=Cookie.get("sug",3)?0:1),"sugStoreSet"in options||(options.sugStoreSet=Cookie.get("sugstore",0));var BAIDUID=Cookie.get("BAIDUID");"resultNum"in options||(options.resultNum=/NR=(\d+)/.test(BAIDUID)&&RegExp.$1?parseInt(RegExp.$1):10),"resultLang"in options||(options.resultLang=/SL=(\d+)/.test(BAIDUID)&&RegExp.$1?parseInt(RegExp.$1):0),"isSwitch"in options||(options.isSwitch=2==Cookie.get("ORIGIN",0)?0:1==Cookie.get("ORIGIN",0)?2:1),"imeSwitch"in options||(options.imeSwitch=Cookie.get("bdime",0))
}catch(e){}window.UPS={writeBAIDUID:writeBAIDUID,reset:reset,get:get,set:set,save:save}}(),function(){var e="https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/plugins/every_cookie_a70bc15.js";("Mac68K"==navigator.platform||"MacPPC"==navigator.platform||"Macintosh"==navigator.platform||"MacIntel"==navigator.platform)&&(e="https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/plugins/every_cookie_mac_82990d4.js"),setTimeout(function(){$.ajax({url:e,cache:!0,dataType:"script"})},0);var t=navigator&&navigator.userAgent?navigator.userAgent:"",o=document&&document.cookie?document.cookie:"",i=!!(t.match(/(msie [2-8])/i)||t.match(/windows.*safari/i)&&!t.match(/chrome/i)||t.match(/(linux.*firefox)/i)||t.match(/Chrome\/29/i)||t.match(/mac os x.*firefox/i)||o.match(/\bISSW=1/)||0==UPS.get("isSwitch"));
bds&&bds.comm&&(bds.comm.supportis=!i,bds.comm.isui=!0),window.__restart_confirm_timeout=!0,window.__confirm_timeout=8e3,window.__disable_is_guide=!0,window.__disable_swap_to_empty=!0,window.__switch_add_mask=!0;var s="https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/js/all_async_search_316369e.js",n="/script";document.write("<script src='"+s+"'><"+n+">"),bds.comm.newindex&&$(window).on("index_off",function(){$('<div class="c-tips-container" id="c-tips-container"></div>').insertAfter("#wrapper"),window.__sample_dynamic_tab&&$("#s_tab").remove()
}),bds.comm&&bds.comm.ishome&&Cookie.get("H_PS_PSSID")&&(bds.comm.indexSid=Cookie.get("H_PS_PSSID"))}();</script>
<script>
if(bds.comm.supportis){
window.__restart_confirm_timeout=true;
window.__confirm_timeout=8000;
window.__disable_is_guide=true;
window.__disable_swap_to_empty=true;
}
initPreload({
'isui':true,
'index_form':"#form",
'index_kw':"#kw",
'result_form':"#form",
'result_kw':"#kw"
});
</script>
<script>
if(navigator.cookieEnabled){
document.cookie="NOJS=;expires=Sat, 01 Jan 2000 00:00:00 GMT";
}
</script>
</body>
</html>
第二种方法使用了 build_opener 这个方法, 用来自定义 opener, 这种方法的好处是可以方便的拓展功能, 例如下面的代码就拓展了自动处理 Cookies 的功能.
In [2]:
import urllib.request
import http.cookiejar
# head: dict of header
def makeMyOpener(head = {
'Connection': 'Keep-Alive',
'Accept': 'text/html, application/xhtml+xml, */*',
'Accept-Language': 'en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3',
'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko'
}):
cj = http.cookiejar.CookieJar()
opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
header = []
for key, value in head.items():
elem = (key, value)
header.append(elem)
opener.addheaders = header
return opener
oper = makeMyOpener()
uop = oper.open('http://www.baidu.com/', timeout = 1000)
data = uop.read()
print(data.decode())
<!DOCTYPE html>
<!--STATUS OK-->
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge">
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<title>百度一下，你就知道</title>
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su:{
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}
var reg = /^(http[s]?:\/\/)?([^\/]+)(.*)/,
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},
set = function(kdomain,vdomain) {
list[kdomain] = vdomain;
};
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get : get,
set : set
}
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result_common_css=$(result_common_css);
result_common_css.attr("data-for","result");
var index_css= $('head [index]');
var wrapper=$("#wrapper");
window.index_on=function(){
index_css.insertAfter("meta:eq(0)");
result_common_css.remove();
wrapper.show();
if(bds.su&&bds.su.U&&bds.su.U.homeInit){
bds.su.U.homeInit();
}
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};
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//不能操作dom，只能改css，否则会丢失输入法状态
result_common_css.insertAfter("meta:eq(0)");
wrapper.show();
index_css.remove();
//$("<div id='wrapper_wrapper'></div>").appendTo("#wrapper");
};
})();
//首页UA diff 监控
$(window).on("load",function() {
var rand = Math.random();
if(rand < 0.01) {
try {
var baseUrl = "//www.baidu.com/nocache/fesplg/s.gif?log_type=hm&type=uamonitor&",
queryString = "";
queryString += "&c_ua=" + encodeURIComponent(navigator.userAgent);
queryString += "&s_ua=" + encodeURIComponent(bds.comm.userAgent);
var url=baseUrl+queryString,
img = new Image(),
img_rand="_LOG_"+new Date().getTime();
img.onload=function(){
delete window[img_rand];
};
window[img_rand]=img;
img.src=url;
} catch(e) {};
}
});
</script>
<script type="text/javascript">var Cookie={set:function(e,t,o,i,s,n){document.cookie=e+"="+(n?t:escape(t))+(s?"; expires="+s.toGMTString():"")+(i?"; path="+i:"; path=/")+(o?"; domain="+o:"")},get:function(e,t){var o=document.cookie.match(new RegExp("(^| )"+e+"=([^;]*)(;|$)"));return null!=o?unescape(o[2]):t},clear:function(e,t,o){this.get(e)&&(document.cookie=e+"="+(t?"; path="+t:"; path=/")+(o?"; domain="+o:"")+";expires=Fri, 02-Jan-1970 00:00:00 GMT")}};!function(){function save(e){var t=[];for(tmpName in options)options.hasOwnProperty(tmpName)&&"duRobotState"!==tmpName&&t.push('"'+tmpName+'":"'+options[tmpName]+'"');
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上述代码运行后通过 Fiddler 抓到的 GET 报文如下所示:
GET http://www.baidu.com/ HTTP/1.1
Accept-Encoding: identity
Connection: close
Host: www.baidu.com
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
Accept: text/html, application/xhtml+xml, */*
Accept-Language: en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3可见我们在代码里写的东西都添加到请求报文里面了.
In [3]:
def saveFile(data):
save_path = './data/temp.out'
f_obj = open(save_path, 'wb') # wb 表示打开方式
f_obj.write(data)
f_obj.close()
经过上面的改进，我们的爬虫现在可以处理更多类型的网页了，先看一下这一阶段我们的成果吧
In [4]:
import re
import urllib.request
import urllib
import http.cookiejar
from collections import deque
# head: dict of header
def makeMyOpener(head = {
'Connection': 'Keep-Alive',
'Accept': 'text/html, application/xhtml+xml, */*',
'Accept-Language': 'en-US,en;q=0.8,zh-Hans-CN;q=0.5,zh-Hans;q=0.3',
'User-Agent': 'Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko'
}):
cj = http.cookiejar.CookieJar()
opener = urllib.request.build_opener(urllib.request.HTTPCookieProcessor(cj))
header = []
for key, value in head.items():
elem = (key, value)
header.append(elem)
opener.addheaders = header
return opener
def saveFile(data, save_path = './temp.out'):
f_obj = open(save_path, 'wb') # wb 表示打开方式
f_obj.write(data)
f_obj.close()
queue = deque()
visited = set()
url = 'http://news.dbanotes.net' # 入口页面, 可以换成别的
queue.append(url)
cnt = 0
oper = makeMyOpener()
while queue:
url = queue.popleft() # 队首元素出队
visited |= {url} # 标记为已访问
print('已经抓取: ' + str(cnt) + ' 正在抓取 <--- ' + url)
cnt += 1
urlop = oper.open(url, timeout=5)
if 'html' not in urlop.getheader('Content-Type'):
continue
# 避免程序异常中止, 用try..catch处理异常
try:
data = urlop.read().decode('utf-8')
#saveFile(data, './data/'+url+'.out')
except:
print('Error in: ', url)
continue
# 正则表达式提取页面中所有队列, 并判断是否已经访问过, 然后加入待爬队列
linkre = re.compile('href="(.+?)"')
for x in linkre.findall(data):
if 'http' in x and x not in visited:
queue.append(x)
print('加入队列 ---> ' + x)
已经抓取: 0 正在抓取 <--- http://news.dbanotes.net
加入队列 ---> http://news.dbanotes.net/news.css
加入队列 ---> http://dbanotes.net/favicon.ico
加入队列 ---> http://news.dbanotes.net/submit
加入队列 ---> https://blog.coding.net/blog/Introducing-Coding-Enterprise
加入队列 ---> http://weibo.com/ttarticle/p/show?id=2309404061974152529226
加入队列 ---> http://tonybai.com/2017/01/11/understanding-linux-network-namespace-for-docker-network/
加入队列 ---> http://www.phpxs.com/post/5569/
加入队列 ---> https://cp.ivpser.com/buylinode
加入队列 ---> http://cn.oncedoc.com/page/view/helper/ixfumwyocn01ai67
加入队列 ---> http://tonybai.com/2016/12/27/when-docker-meets-systemd/
加入队列 ---> http://tonybai.com/2016/12/30/install-kubernetes-on-ubuntu-with-kubeadm/
加入队列 ---> https://laravel-china.org/topics/3432
加入队列 ---> https://blog.coding.net/blog/coding-review-2016
加入队列 ---> https://github.com/baidu/tera/
加入队列 ---> http://cn.oncedoc.com/blog/view/ix4clpo5cn01ao0d
加入队列 ---> http://28930717.blog.hexun.com/109481607_d.html
加入队列 ---> https://www.evget.com/article/2016/12/22/25339.html
加入队列 ---> https://zhuanlan.zhihu.com/p/23646569
加入队列 ---> https://blog.coding.net/blog/spring-mvc-cors
加入队列 ---> http://gold.xitu.io/entry/58200ec367f3560058a6f8fc/
加入队列 ---> http://tonybai.com/2016/11/25/the-security-settings-for-kubernetes-cluster/
加入队列 ---> http://gold.xitu.io/entry/582492025bbb5000590ef04d/
加入队列 ---> http://gold.xitu.io/entry/58217b84570c350060bc40f8/
加入队列 ---> https://www.fdzh.org/blog/2016/11/22/fedora-25/
加入队列 ---> http://gold.xitu.io/entry/5826ef85570c3500586b241d/
加入队列 ---> http://insights.thoughtworkers.org/frontend-future-radar/
加入队列 ---> http://www.phpxs.com/post/5537/
加入队列 ---> https://lanmaowz.com/open-dht-spider/
加入队列 ---> https://blog.coding.net/blog/forget-crowdsourcing
加入队列 ---> https://github.com/vim/vim/blob/master/runtime/doc/version8.txt
加入队列 ---> http://gold.xitu.io/entry/57fc9ea40bd1d00058d170f9/
加入队列 ---> http://gold.xitu.io/entry/5817117967f356005868b8a8/
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已经抓取: 1 正在抓取 <--- http://news.dbanotes.net/news.css
已经抓取: 2 正在抓取 <--- http://dbanotes.net/favicon.ico
已经抓取: 3 正在抓取 <--- http://news.dbanotes.net/submit
已经抓取: 4 正在抓取 <--- https://blog.coding.net/blog/Introducing-Coding-Enterprise
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已经抓取: 5 正在抓取 <--- http://weibo.com/ttarticle/p/show?id=2309404061974152529226
Error in: http://weibo.com/ttarticle/p/show?id=2309404061974152529226
已经抓取: 6 正在抓取 <--- http://tonybai.com/2017/01/11/understanding-linux-network-namespace-for-docker-network/
---------------------------------------------------------------------------
timeout Traceback (most recent call last)
/usr/lib/python3.5/urllib/request.py in do_open(self, http_class, req, **http_conn_args)
1253 try:
-> 1254 h.request(req.get_method(), req.selector, req.data, headers)
1255 except OSError as err: # timeout error
/usr/lib/python3.5/http/client.py in request(self, method, url, body, headers)
1105 """Send a complete request to the server."""
-> 1106 self._send_request(method, url, body, headers)
1107
/usr/lib/python3.5/http/client.py in _send_request(self, method, url, body, headers)
1150 body = _encode(body, 'body')
-> 1151 self.endheaders(body)
1152
/usr/lib/python3.5/http/client.py in endheaders(self, message_body)
1101 raise CannotSendHeader()
-> 1102 self._send_output(message_body)
1103
/usr/lib/python3.5/http/client.py in _send_output(self, message_body)
933
--> 934 self.send(msg)
935 if message_body is not None:
/usr/lib/python3.5/http/client.py in send(self, data)
876 if self.auto_open:
--> 877 self.connect()
878 else:
/usr/lib/python3.5/http/client.py in connect(self)
848 self.sock = self._create_connection(
--> 849 (self.host,self.port), self.timeout, self.source_address)
850 self.sock.setsockopt(socket.IPPROTO_TCP, socket.TCP_NODELAY, 1)
/usr/lib/python3.5/socket.py in create_connection(address, timeout, source_address)
710 if err is not None:
--> 711 raise err
712 else:
/usr/lib/python3.5/socket.py in create_connection(address, timeout, source_address)
701 sock.bind(source_address)
--> 702 sock.connect(sa)
703 return sock
timeout: timed out
During handling of the above exception, another exception occurred:
URLError Traceback (most recent call last)
<ipython-input-4-06d7d662d912> in <module>()
42 print('已经抓取: ' + str(cnt) + ' 正在抓取 <--- ' + url)
43 cnt += 1
---> 44 urlop = oper.open(url, timeout=5)
45 if 'html' not in urlop.getheader('Content-Type'):
46 continue
/usr/lib/python3.5/urllib/request.py in open(self, fullurl, data, timeout)
464 req = meth(req)
465
--> 466 response = self._open(req, data)
467
468 # post-process response
/usr/lib/python3.5/urllib/request.py in _open(self, req, data)
482 protocol = req.type
483 result = self._call_chain(self.handle_open, protocol, protocol +
--> 484 '_open', req)
485 if result:
486 return result
/usr/lib/python3.5/urllib/request.py in _call_chain(self, chain, kind, meth_name, *args)
442 for handler in handlers:
443 func = getattr(handler, meth_name)
--> 444 result = func(*args)
445 if result is not None:
446 return result
/usr/lib/python3.5/urllib/request.py in http_open(self, req)
1280
1281 def http_open(self, req):
-> 1282 return self.do_open(http.client.HTTPConnection, req)
1283
1284 http_request = AbstractHTTPHandler.do_request_
/usr/lib/python3.5/urllib/request.py in do_open(self, http_class, req, **http_conn_args)
1254 h.request(req.get_method(), req.selector, req.data, headers)
1255 except OSError as err: # timeout error
-> 1256 raise URLError(err)
1257 r = h.getresponse()
1258 except:
URLError: <urlopen error timed out>
Content source: yttty/python3-scraper-tutorial
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