javascript实现剪切板功能

<script type="text/javascript">
        function copyToClipBoard(clipBoardContent) {
     
                if(window.clipboardData){
              window.clipboardData.clearData();
              window.clipboardData.setData("Text", clipBoardContent);
      }else if(navigator.userAgent.indexOf("Opera") != -1){
              window.location = clipBoardContent;
       }else if (window.netscape){
              try{
                     netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");
             }catch (e){
                     alert("您的当前浏览器设置已关闭此功能！请按以下步骤开启此功能！/n新开一个浏览器，在浏览器地址栏输入'about:config'并回车。/n然后找到'signed.applets.codebase_principal_support'项，双击后设置为'true'。/n声明：本功能不会危极您计算机或数据的安全！");
             }
             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 = clipBoardContent;
              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("已成功复制！");
      return true;
}

 

}