js实现的复制兼容chrome和IE

<script type="text/javascript"> 
function copyUrl2() 
{ 
var Url2=document.getElementById("biao1"); 
Url2.select(); // 选择对象 
document.execCommand("Copy"); // 执行浏览器复制命令 
alert("已复制好，可贴粘。"); 
} 
</script> 
<textarea cols="20" rows="10" id="biao1">用户定义的代码区域</textarea> 
<input type="button" onClick="copyUrl2()" value="点击复制代码" />

<script src="http://www.weicaiyun.com/assets/js/copy/ZeroClipboard.js"></script> 

<script type="text/javascript"> 

var clip = new ZeroClipboard.Client(); 
clip.setHandCursor( true ); 
clip.setText('复制内容'); 
clip.glue('button'); 

</script> 

<input type="button" id="button" value="点击复制代码" />