javascript Event.observe(window, "load", function(){..} v/s window.onload = function(){..}
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Event.observe(window, "load", function(){..} v/s window.onload = function(){..}
提问by Shreedhar
Even though both do the samething, i just want to know is there any specific advantage using one over another?
即使两者都做同样的事情，我只想知道使用一个比另一个有什么特定的优势吗？
Event.observe(window, "load", function(){
//do something
});
window.onload = function(){
//do something
}
回答by Andries
The difference is that window.onloadis defined in the DOM Level 0 Event Model and will erase all earlier registed events. It's an 'native' call from an old API.
不同之处在于window.onloadDOM Level 0 Event Model 中定义的，将删除所有早期注册的事件。这是来自旧 API 的“本机”调用。
The Event.observefrom the prototype javascript framework will determine the best event attacher available. A facade pattern. In modern browsers, the addEventListenerwill be called - attachEventin case of Internet Explorer below version 9. In old browsers the onloadwill be called.
在Event.observe从原型javascript框架将确定附加器提供最佳的事件。立面图案。在现代浏览器中，addEventListener将被调用 -attachEvent在版本 9 以下的 Internet Explorer 的情况下。在旧浏览器中，onload将被调用。
It obvious that a facade will choose the best option available, like Event.observefor prototype or .loadin case of jQuery for example.
很明显，外观将选择可用的最佳选项，例如Event.observe原型或.loadjQuery。
The methods from the DOM Level 2 Event Model are preferred over the DOM Level 0 Event Model methods because they act as observers and don't erase previous handlers.
DOM 级别 2 事件模型中的方法优于 DOM 级别 0 事件模型方法，因为它们充当观察者并且不会删除以前的处理程序。
回答by Bergi
Read quirksmode.org's introduction into events. The difference is between the traditional modeland the advanced models, which need a wrapper because M$ does/did not support the W3-standard and a distinction needs to be made.
阅读 quirksmode.org 对事件的介绍。区别在于传统模型和高级模型之间需要一个包装器，因为 M$ 不支持/不支持 W3 标准并且需要进行区分。
