问题描述
如果 XMLHttpRequest 对象支持 W3C 进展事件?我的意思是如果将 onload、onprogress、onabort、onerror 等属性设置为某些处理函数如上所述，那些函数调用了这些事件.
Is there any way to check within JavaScript if XMLHttpRequest object supports W3C Progress Events? I mean here if setting onload, onprogress, onabort, onerror, etc. properties to some handler function would have those function called those events, as described.
附加(额外)问题:有没有办法增加 XMLHttpRequest(例如使用一些计时器)来支持这些事件?
Additional (bonus) question: is there a way to augment XMLHttpRequest (e.g. using some timers) to support those events?
旁注:我首先在 XMLHttpRequest 这里
推荐答案
你试过这样吗?
try {
var xhr = new XMLHttpRequest();
if ('onprogress' in xhr) {
// Browser supports W3C Progress Events
} else {
// Browser does not support W3C Progress Events
}
} catch (e) {
// Browser is IE6 or 7
}
我在 Firefox &IE8.Firefox 显示它支持它.IE 表示它不支持 W3C Progress 事件.
I tested this in Firefox & IE8. Firefox shows it supports it. IE says it has no support for W3C Progress events.
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