QQ How to implement login when you know the client is not logged on? Then you can sign in with one click?

QQ How to implement login when you know the client is not logged on? Then you can sign in with one click?

How does the Web page know about my local application situation?

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can also be a service you on any QQ site will be issued notice QQ This service can tell whether to login

Plug-in equivalent to run in the browser of the local program, can do a lot of JS can not do things, such as calling local programs, read and write local files, access to the network and so on. With the plug-in and local QQ communication is very simple thing.

Because the permissions of the plug-in is very large, so there will be a lot of malicious plug-ins appear, general security software has malicious plug-in detection function

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