用javascript实现分割提取页面所需内容

  <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

  <html xmlns="http://www.w3.org/1999/xhtml">

  <head>

  <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

  <title>文档</title>

  <style>

  textarea {

  width:100%;

  height:200px;

  }

  </style>

  </head>

  <body>

  <textarea id="xxx">

  <P><KBD class=showflash title=http://localhost/elearning/storeagemultimirror/multiMirror.swf> 正文正文<a href="javascript:;" onClick="javascript:tagshow(event, '%D0%E9%C4%E2%BB%AF');" target="_self"><u><strong>标签</strong></u>< /a>正文正文正文正文正文正文。</KBD><BR></P>

  </textarea>

  <input type="button" value="获取内容" onclick="getcontent();" />

  <textarea id="aaa"></textarea>

  <textarea id="bbb"></textarea>

  <script>

  function getcontent(){

  var str=document.getElementById("xxx").value;

  document.getElementById("aaa").value=str.match(/<KBD.+?title=["']?(.+?)[ '">]/i)[1];

  document.getElementById("bbb").value=str.match(/<KBD.+?>((?:.|\n)+?)<\/KBD>/i)[1];

  }

  </script>

  </body>

  </html>