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ÀëÏßʼþ(Online and offline events):
https://developer.mozilla.org/En/Online_and_offline_events
https://bug336359.bugzilla.mozilla.org/attachment.cgi?id=220609
http://ejohn.org/blog/offline-events/
postMessage :
http://msdn.microsoft.com/en-us/library/cc197015(VS.85).aspx
http://ejohn.org/blog/postmessage-api-changes/
http://hi.baidu.com/bdui/blog/item/eedf91509c6ab2591038c2fb.html
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