js 重写alert 隐藏ip或者域名

<script>
//重写alert
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 不显示ip地址  
var wConfirm = window.confirm;  
window.confirm = function (message) {  
    try {  
        var iframe = document.createElement("IFRAME");  
        iframe.style.display = "none";  
        iframe.setAttribute("src", 'data:text/plain,');  
        document.documentElement.appendChild(iframe);  
        var alertFrame = window.frames[0];  
        var iwindow = alertFrame.window;  
        if (iwindow == undefined) {  
            iwindow = alertFrame.contentWindow;  
        }  
        var result = iwindow.confirm(message);  
        iframe.parentNode.removeChild(iframe);  
        return result;  
    }  
    catch (exc) {  
        return wConfirm(message);  
    }  
}

</script>