js复制功能支持forIE/FireFox/mozilla/ns_javascript技巧

这里有两各上方式 : 
 
// 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！
请在浏览器地址栏输入'about:config'并回车
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]