JS实现复制功能 IE上的 和兼容Firefox

最近做项目的时候需要用到这样的js功能，在网上gg和baidu了一下，找到了这两段js代码，在这理为大家整理了一下。。

IE下的：

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 function copyToClipboard() {    
    var copyText=window.document.getElementById("filePath").value; 
    
      if (window.clipboardData) 
        {
            window.clipboardData.setData("Text", copyText)
        } 
        else 
        {
            var flashcopier = 'flashcopier';
            if(!document.getElementById(flashcopier)) 
            {
              var divholder = document.createElement('div');
              divholder.id = flashcopier;
              document.body.appendChild(divholder);
            }
            document.getElementById(flashcopier).innerHTML = '';
            var divinfo = '<embed src="../js/_clipboard.swf" FlashVars="clipboard='+encodeURIComponent(copyText)+'" width="0" height="0" type="application/x-shockwave-flash"></embed>';
            document.getElementById(flashcopier).innerHTML = divinfo;
        }
      alert('复制成功！');

}   
  

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这段是兼容Firefox下的：

function copyToClipboard() {    
    var txt=window.document.getElementById("filePath").value; //-----控件的 id=filePath
     if(window.clipboardData) {    
             window.clipboardData.clearData();    
             window.clipboardData.setData("Text", txt);   
               alert("复制成功！");     
     } else if(navigator.userAgent.indexOf("Opera") != -1) {    
          window.location = txt;    
     } else if (window.netscape) {    
          try {    
               netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");    
          } catch (e) {    
               alert("被浏览器拒绝！\n请在浏览器地址栏输入'about:config'并回车\n然后将'signed.applets.codebase_principal_support'设置为'true'");    
          }    
          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 = 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("复制成功！");    
     }    

}   

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