IE和firefox通用的复制到剪贴板的JS函数

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("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！")         }    

?from http://www.iteye.com/topic/125198