javascript获取选中的文本的方法代码

  

复制代码 代码如下:

  <!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>

  <title> new document </title>

  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

  <style>

  body { font-size:12px; }

  #show { background-color:#CCFF99; }

  </style>

  </head>

  <body>

  <textarea id="content" cols="30" rows="10">

  河中鱼类离奇死亡,下游居民频染怪病,沿岸植物不断变异,是残留农药?还是生化攻击?敬请关注今晚CCTV-10《科学探索》,即将播出的专题节目:《神秘的河边洗脚人--中国男足》

  </textarea>  

  <button id="btn">获取选中值</button>

  <div id="show"></div>

  <script>

  String.prototype.trim = function() {

  return this.replace(/^\s+|\s+$/g, "");

  }

  /* 方法一 FF下有点问题 */

  function getSelectText() {

  try{

  // IE: document.selection.createRange() W3C:window.getSelection()

  var selectText = (document.selection && document.selection.createRange )? document.selection.createRange().text : window.getSelection().toString();

  if(selectText != null && selectText.trim() != ""){

  return selectText;

  }

  }catch(err){}

  }

  /* 方法二 */

  function getSelectText2(id) {

  var t = document.getElementById(id);

  if(window.getSelection) {

  if(t.selectionStart != undefined && t.selectionEnd != undefined) {

  return t.value.substring(t.selectionStart, t.selectionEnd);

  } else {

  return "";

  }

  } else {

  return document.selection.createRange().text;

  }

  }

  document.getElementById('btn').onclick = function() {

  document.getElementById('show').innerHTML = getSelectText2('content');

  }

  </script>

  </body>

  </html>