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.

它在firefox和ie8中确实有效。我看不出有什么浏览器是它不能运行的。这是javascript工作的基本原理，尽管人们不经常看到它与原生函数一起使用=)

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。

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。

超铃报警功能无危险。每个浏览器都支持它。

例如:

// function over riding. Redirecting to Console with Firebug installed.
function alert(message) { 
    console.info(message);
} 

alert('This is an override.');

Ladislav。 对于IE8，你可以像这样重新定义alert()

/** 
 * Definition of global attached to window properties <br/>
 */ 
    (function() {
      nalert = window.alert;
      Type = {
          native: 'native',
          custom: 'custom'
      };
    })();

/**
 * Factory method for calling alert(). 
 * It will be call a native alert() or a custom redefined alert() by a Type param.
 * This defeinition need for IE
 */ 
    (function(proxy) {

          proxy.alert = function () {
          var message = (!arguments[0]) ? 'null': arguments[0];
          var type = (!arguments[1]) ? '': arguments[1];

          if(type && type == 'native') {
           nalert(message);
          }
          else {
               document.write('<h1>I am redefiend alert()<br/>Alert say: '+message+'</h1>');
          }     
      };
   })(this);

并调用as

alert('Hello, hacker!');
nalert('I am native alert');
alert('Hello, user!', Type.custom);