js复制到粘贴板

<script type="text/javascript">
    function copyData() {
        var copyText = document.getElementById("text1").value;
        window.clipboardData.setData("Text",copyText);
    }
	function copy2Clip()
{
 var txt = document.getElementById("text1").value;
 if(window.clipboardData)
 {
  window.clipboardData.clearData();
  window.clipboardData.setData("Text", txt);
  alert("成功复制！到聊天窗口粘贴(Ctrl+v)即可");
  return true;
 }
 else if(navigator.userAgent.indexOf("Opera") != -1)
 {
  alert("此功能不支持Opera,请手工复制文本框中内容");
  return false;
 }
 else if (window.netscape)
 {
  try
  {
   netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
  }
  catch (e)
  {
   alert("您的firefox安全限制限制您进行剪贴板操作，请打开'about:config'将 signed.applets.codebase_principal_support'设置为true'之后重试");
   return false;
  }
  var clip = Components.classes['@mozilla.org/widget/clipboard;1'].createInstance(Components.interfaces.nsIClipboard);
  if (!clip)
  {
   return false;
  }
  var trans = Components.classes['@mozilla.org/widget/transferable;1'].createInstance(Components.interfaces.nsITransferable);
  if (!trans)
  {
   return false;
  }
  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 = txt;
  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("成功复制！到聊天窗口粘贴(Ctrl+v)即可");
  return true;
 }
} 
</script>
     <textarea  id="text1" cols="" rows="" class="textarea_2" readonly>
	 12343546758798-90=-0-9=9=-	 </textarea> 
    <input id="btnCopyUrl" type="button" value="复制URL到粘贴板" onclick="copyData()" />
	 <input id="btnCopyUrl2" type="button" value="复制URL到粘贴板" onclick="copy2Clip()" />