javascript获取选中的文本的方法代码


<!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 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>获取选中值</button>
<div></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>  

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