重写alert,confirm 去除标题中URL

JS

var wAlert = window.alert;  
window.alert = 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;  
        }  
        iwindow.alert(message);  
        iframe.parentNode.removeChild(iframe);  
    }  
    catch (exc) {  
        return wAlert(message);  
    }  
}  
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);  
    }  
}