近期在做chrome插件，需要提取页面里的一些数，简单说就是企业版微博的后台数据，因为微博不提供导出功能。最开始是用php完成的，但是每次都需要先把页面代码保存下来，再进行提取，很麻烦。chrome插件可以和页面DOM交互，看起来很方便，所以开始学着写。javascript和jQuery都是边学习边写。
以下代码实现了把需要的数据提出来，需要补充xmlHttpObject部分。
<script type="text/javascript" charset="UTF-8" src="http://chenbinx.cn/kaiguan/jquery-2.0.2.min.js"></script> <script type="text/javascript"> $(document).ready(function(){ $("span.main_title").click(function(){ console.log("执行了！"); var m=$("[class=‘S_line2 W_tc fst‘]"); time=m[0];//选取第一个节点 console.log("日期为："+time.innerText);//why var content=nextSibling(time);//获取兄弟节点 console.log("博文内容为："+content.innerText); var read=nextSibling(content); console.log("博文阅读数为："+read.innerText); var zan=getFirst(nextSibling(read));//获取下一个兄弟的第一个孩子节点 console.log("转评赞为："+zan.innerText); var clicknum=nextSibling(zan);//获取这个孩子的下一个兄弟 console.log("短链点击为："+clicknum.innerText); }) }) function getFirst(elem){ for(var i=0,e;e=elem.childNodes[i++];){ if(e.nodeType==1) return e; } } //下一个兄弟节点 function nextSibling(node) { var tempLast = node.parentNode.lastChild; if (node == tempLast) return null; var tempObj = node.nextSibling; while (tempObj.nodeType != 1 && tempObj.nextSibling != null) { tempObj = tempObj.nextSibling; } return (tempObj.nodeType==1)? tempObj:null; } //前一个兄弟节点 function prevSibling(node) { var tempFirst = node.parentNode.firstChild; if (node == tempFirst) return null; var tempObj = node.previousSibling; while (tempObj.nodeType != 1 && tempObj.previousSibling != null) { tempObj = tempObj.previousSibling; } return (tempObj.nodeType==1)? tempObj:null; } </script>
这里把需要提取数的源代码也附上
<body>
<div class="E_PCD_chart2">
<div class="WB_cardtitle_b S_line2">
<h4 class="obj_name">
<span class="main_title W_fb W_f14">博文分析</span>
<span class="subtitle S_txt2">
<span class="W_icon icon_askS" action-type="layerIcon" action-data="t=2"></span>
</span>
</h4>
</div>
<div class="WB_innerwrap" node-type="articlesList">
<table class="EM_table">
<colgroup>
<col width="12%">
<col width="37%">
<col width="12%">
<col>
<col width="9%">
</colgroup>
<thead>
<tr>
<th class="S_line2 S_txt2 W_tc fst">发布时间</th>
<th class="S_line2 S_txt2">博文内容</th>
<th class="S_line2 S_txt2">博文阅读数</th>
<th class="S_line2 S_txt2 W_tc">
<span>互动数</span>
<i class="ann c1"></i>
<span>转评赞</span>
<i class="ann c2"></i>
<span>短链点击</span>
</th>
<th class="S_line2 S_txt2 lst">
操作
<span class="W_icon icon_askS" action-type="layerIcon" action-data="t=1"></span>
</th>
</tr>
</thead>
<tbody>
<tr>
<td class="S_line2 W_tc fst">
<p>2015-05-24 21:39</p>
</td>
<td class="S_line2">
<a href="http://weibo.com/1854902371/CjmjFoKBD" target="_blank" class="S_txt1">#520爱尚我# 呛口同款西班牙芭蕾新履，Pretty Ballerinas大促5折...</a>
</td>
<td class="S_line2">7564</td>
<td class="S_line2">
<dl class="EM_stripe clearfix">
<dt class="W_fl W_tr">6</dt>
<dd class="W_fl">
<span class="stripe">
<i class="inner c1" style="width:2.52%;"></i>
</span>
</dd>
</dl>
<dl class="EM_stripe clearfix">
<dt class="W_fl W_tr">12</dt>
<dd class="W_fl">
<span class="stripe">
<i class="inner c2" style="width:5.04%;"></i>
</span>
</dd>
</dl>
</td>
<td class="S_line2 lst">
<a class="S_txt1" href="javascript:;" action-type="extension" action-data="url=http%3A%2F%2Fpromote.vip.weibo.com%2Fpromote%3Ffrom%3De_weibo%26mid%3D3846140195899029%26ru%3Dhttp%3A%2F%2Fweibo.com%2Fp%2F1006061854902371%2Fmanage%3Fiframe_url%3Dhttp%3A%2F%2Fe.weibo.com%2Fv1%2Feps%2Fdata%2Farticlestats%26failRu%3Dhttp%3A%2F%2Fweibo.com%2Fp%2F1006061854902371%2Fmanage%3Fiframe_url%3Dhttp%3A%2F%2Fe.weibo.com%2Fv1%2Feps%2Fdata%2Farticlestats" suda-uatrack="key=DataService&value=123">推广</a>
</td>
</tr>
<tr>
<td class="S_line2 W_tc fst">
<p>2015-05-24 17:26</p>
</td>
<td class="S_line2">
<a href="http://weibo.com/1854902371/CjkEYrqia" target="_blank" class="S_txt1">#520爱尚我# 尚品网5周年大促即将结束，ASH全场4折起！明星款至...</a>
</td>
<td class="S_line2">16204</td>
<td class="S_line2">
<dl class="EM_stripe clearfix">
<dt class="W_fl W_tr">6</dt>
<dd class="W_fl">
<span class="stripe">
<i class="inner c1" style="width:2.52%;"></i>
</span>
</dd>
</dl>
<dl class="EM_stripe clearfix">
<dt class="W_fl W_tr">17</dt>
<dd class="W_fl">
<span class="stripe">
<i class="inner c2" style="width:7.14%;"></i>
</span>
</dd>
</dl>
</td>
<td class="S_line2 lst">
<a class="S_txt1" href="javascript:;" action-type="extension" action-data="url=http%3A%2F%2Fpromote.vip.weibo.com%2Fpromote%3Ffrom%3De_weibo%26mid%3D3846076526535926%26ru%3Dhttp%3A%2F%2Fweibo.com%2Fp%2F1006061854902371%2Fmanage%3Fiframe_url%3Dhttp%3A%2F%2Fe.weibo.com%2Fv1%2Feps%2Fdata%2Farticlestats%26failRu%3Dhttp%3A%2F%2Fweibo.com%2Fp%2F1006061854902371%2Fmanage%3Fiframe_url%3Dhttp%3A%2F%2Fe.weibo.com%2Fv1%2Feps%2Fdata%2Farticlestats" suda-uatrack="key=DataService&value=123">推广</a>
</td>
</tr>
<tr>
<td class="S_line2 W_tc fst">
<p>2015-05-24 14:05</p>
</td>
<td class="S_line2">
<a href="http://weibo.com/1854902371/CjjlobuW8" target="_blank" class="S_txt1">#520爱尚我# 尚品网5周年大促，URBAN REVIVO、DAZZLE、d‘zzit等...</a>
</td>
<td class="S_line2">13614</td>
<td class="S_line2">
<dl class="EM_stripe clearfix">
<dt class="W_fl W_tr">3</dt>
<dd class="W_fl">
<span class="stripe">
<i class="inner c1" style="width:1.26%;"></i>
</span>
</dd>
</dl>
<dl class="EM_stripe clearfix">
<dt class="W_fl W_tr">16</dt>
<dd class="W_fl">
<span class="stripe">
<i class="inner c2" style="width:6.72%;"></i>
</span>
</dd>
</dl>
</td>
<td class="S_line2 lst">
<a class="S_txt1" href="javascript:;" action-type="extension" action-data="url=http%3A%2F%2Fpromote.vip.weibo.com%2Fpromote%3Ffrom%3De_weibo%26mid%3D3846025942740532%26ru%3Dhttp%3A%2F%2Fweibo.com%2Fp%2F1006061854902371%2Fmanage%3Fiframe_url%3Dhttp%3A%2F%2Fe.weibo.com%2Fv1%2Feps%2Fdata%2Farticlestats%26failRu%3Dhttp%3A%2F%2Fweibo.com%2Fp%2F1006061854902371%2Fmanage%3Fiframe_url%3Dhttp%3A%2F%2Fe.weibo.com%2Fv1%2Feps%2Fdata%2Farticlestats" suda-uatrack="key=DataService&value=123">推广</a>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
原文：http://www.cnblogs.com/cibirii/p/4530578.html