如何覆盖javascript本机对象的内置方法 [英] how to overwrite a builtin method of javascript native objects

问题描述

让我们说我们有窗口对象的警报方法。我想用漂亮的警报框来增强它。

Lets say we have alert method of window object. I would like to enhance it with nice alertbox.

我还想保存现有的警报方法，以便我们可以在应用程序结束后切换回来。

Also I want to save the existing alert method so that we can switch back once our application is over.

像这样的东西，但它在firefox控制台中抛出错误。

Something like this, but its throwing error in firefox console.

window.prototype.alert = function(){

}

推荐答案

你可以;

var base = window.alert;
window.alert = function(message) {
    document.getElementById("myalertwidget").innerHTML = message;
    return base.apply(this, arguments);
};

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