When it comes to js browser functions window.alert is pre-eminent and most well known, people who don't know js know alert() -- rest assured it is supported in all browsers in use today and your code snippet is as well. However, I wouldn't override (well this is more like refactoring rather than override in the OOP sense) alert() for a particular use case as yours because when you actually need to use alert() with no template, and you probably will, then you'll need another non-alert function to do so.

尽管大多数浏览器支持重写它，但要小心使用它所做的事情。

由于默认的警告框阻塞了执行线程，一些依赖此行为的库可能不再工作(充其量)。

您应该做一个好公民，避免接触本机API。如果你这样做了，当你使用第三方代码时，你可以把事情分开。

然而，如果你想在特定的上下文中重新定义警报行为，你可以用一个匿名函数来包围它，就像这样:

/* new funky alert */
function myFunkyAlert(msg) { 
    /* here goes your funky alert implementation */
    alert("Look ma!\n" + msg);
}

(function(alert) { // anonymous function redefining the "alert"

    /* sample code */
    alert("Hello World!");

})(myFunkyAlert);

When it comes to js browser functions window.alert is pre-eminent and most well known, people who don't know js know alert() -- rest assured it is supported in all browsers in use today and your code snippet is as well. However, I wouldn't override (well this is more like refactoring rather than override in the OOP sense) alert() for a particular use case as yours because when you actually need to use alert() with no template, and you probably will, then you'll need another non-alert function to do so.

现代浏览器中的所有JavaScript实现都支持重写。

危险很简单，如果您重写了诸如alert()这样的常见函数，就会把其他团队成员逼疯。

所以除非你重写函数作为调试或修改现有代码的工具，否则我认为没有任何理由这样做。只需要创建一个新函数。

我认为每个Javascript实现都将支持这一点，并且这样做不会有任何危险。通常用HTML/CSS代替简单的os风格的警告框。这样做意味着您不必更改现有的代码!这一事实使得Javascript非常棒。

正如在许多其他答案中所述，您可以使用

window.alert = null

or

window.alert = function(){}

然而，这并不一定会覆盖Window构造函数原型上的函数(注意大写的W)，所以黑客仍然可以输入:

Window.prototype.alert.apply(window, ["You were hacked!"]);

因此，你还需要重写该函数:

Window.prototype.alert = null

or

Window.prototype.alert = function(){}