图解script的defer跟async

图解script的defer和async

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图解script的defer和async：

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http://msdn.microsoft.com/en-us/library/ms533719%28VS.85%29.aspx

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https://developer.mozilla.org/En/HTML/Element/Script

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http://www.w3.org/TR/html5/scripting-1.html#script

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