When document.readystate==complete is that the same when onload fires?

In Internet Explorer, when onreadystatechange is fired, and readystate switches to complete, is that the same time onload event triggers? Have all t开发者_开发知识库he requests completed by this time?

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document.onreadystatechange is typically more optimal than window.onload as it fires before all external resources such as images are loaded. However, it's not well supported at the moment (but if you're only concerned with IE, then it's not a problem).

See: https://developer.mozilla.org/en/DOM/document.onreadystatechange

Or, for IE: http://msdn.microsoft.com/en-us/library/ms536957(v=vs.85).aspx

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document.readyState is a property and window.onload is an event

http://www.w3schools.com/jsref/prop_doc_readystate.asp

http://www.w3schools.com/js/js_events.asp