Remove the alert display domain

Add the following code to the page:

 1  (function(){
 2         window.alert = function(name){
 3         　　var iframe = document.createElement("IFRAME");
 4         　　iframe.style.display="none";
 5         　　iframe.setAttribute("src", 'data:text/plain');
 6         　　document.documentElement.appendChild(iframe);
 7         　　window.frames[0].window.alert(name);
 8         　　iframe.parentNode.removeChild(iframe);
 9         }
10 })();