js-alert去掉域名

(function(){
        window.alert = function(name){
            var iframe = document.createElement("IFRAME");
            iframe.style.display="none";
            iframe.setAttribute("src", 'data:text/plain');
            document.documentElement.appendChild(iframe);
            window.frames[0].window.alert(name);
            iframe.parentNode.removeChild(iframe);
        }
    })();