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How to implement web code scanning login, please give me some ideas

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Release： 2016-09-23 03:30:05
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Recently I am working on a web instant messaging, which has a QR code login function. I've never done this before, so I'm looking for an expert to talk about it.
How did the QR code come from? If the web side monitors the mobile phone to scan the code successfully, and the server has sent the data

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