파이어폭스와 IE 모두에서 지원되는 복제 클립보드 기능

function copyToClipboard(txt) {   
       if(window.clipboardData) {   
                 window.clipboardData.clearData();   
                window.clipboardData.setData("Text", txt);  
                 alert(" ！") 
       } else if(navigator.userAgent.indexOf("Opera") != -1) {   
             window.location = txt;   
              alert(" ！");
        } else if (window.netscape) {   
            try {   
                  netscape.security.PrivilegeManager.enablePrivilege("UniversalXPConnect");   
             } catch (e) {   
                 alert(" ！
 'about:config' 
  'signed.applets.codebase_principal_support' '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(" ！")   
        }   
  }