js 复制功能 支持 for IE/FireFox/mozilla/ns

这里有两各上方式 : 
<script language="javascript" type="text/javascript"> 
// js 复制功能 支持 for IE/FireFox/mozilla/ns 
function copy_clip(meintext) 
{ 
 if (window.clipboardData)  
   { 
   window.clipboardData.setData("Text", meintext); 
   } 
   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=meintext; 
    
   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(" 下面的信息复制到剪贴板 :\n\n" + meintext); 
   return false; 
} 
function copyToClipboard(txt) { 
     if(window.clipboardData) { 
             window.clipboardData.clearData(); 
             window.clipboardData.setData("Text", txt); 
     } else if(navigator.userAgent.indexOf("Opera") != -1) { 
          window.location = txt; 
     } else if (window.netscape) { 
          try { 
               netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect"); 
          } catch (e) { 
               alert("你使用的FF浏览器,复制功能被浏览器拒绝！\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); 
     } 
} 
var o="js 复制功能 支持 for IE/FireFox/mozilla/ns"; 
alert("第一种方式复制内容如下:\n"+o); 
copy_clip(o); 
alert("第二种方式复制内容如下:\n"+o); 
copyToClipboard(o); 
alert("两种都测试了,你看看效果,找个地方粘贴一下!或者自己在本地上写个网页一个个函数测试!"); 
</script>

  [Ctrl+A 全选 注:如需引入外部Js需刷新才能执行]