一直都需要的复制到系统剪贴板之IE,firefox兼容版

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 
<script type="text/javascript"> 
// <![CDATA[ 
function copy_clip(copy){ 
if (window.clipboardData){ 
window.clipboardData.setData("Text", copy);} 
else if (window.netscape){ 
netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect'); 
var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard); 
if (!clip) return; 
var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable); 
if (!trans) return; 
trans.addDataFlavor('text/unicode'); 
var str = new Object(); 
var len = new Object(); 
var str = Components.classes["@mozilla.org/supports-string;1"].createInstance(Components.interfaces.nsISupportsString); 
var copytext=copy; 
str.data=copytext; 
trans.setTransferData("text/unicode",str,copytext.length*2); 
var clipid=Components.interfaces.nsIClipboard; 
if (!clip) return false; 
clip.setData(trans,null,clipid.kGlobalClipboard);} 
alert("已复制"+copy) 
return false; 
} 
// ]]> 
</script> 
<h1>请另存代码测试</h1> 
<input type="text" id="ff" value="www.blueidea.com" /><button onclick="copy_clip(document.getElementById('ff').value)">复制 
</button>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]