去除移动端alert/confirm的网址(url)

移动端的alert、confirm都会显示来源的url，影响体验 下面的代码将alert和confirm重写了一遍，可去除url  参考了网上代码，完善了confirm不同状态跳转   示例代码：

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/*remove url of alert/confirm*/  
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);  
    }  
} 

var r=confirm("Press a button");
if (r==true)
{
	document.write("You pressed OK!");
}
else
{
	document.write("You pressed Cancel!");
}