重写Alert和confirm方法去除地址显示

//重写alert方法，去掉地址显示

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);
}
//重写confirm方法，去掉地址显示
window.confirm=function(name){
var ifram=document.createElement("IFRAME");
iframe.style.display="none";
iframe.setAttribute("src",'data:text/plain,');
document.documentElement.appendChild(iframe);
var result=window.frames[0].window.confirm(name);
iframe.parentNode.remveChild(iframe);
return result;
}