# 扫码登录如何实现的

![](/files/-M13gSXdPVsVWCG8mzV6)

①：用户 A 访问微信网页版，微信服务器为这个会话生成一个全局唯一的 ID，上面的 URL 中 `obsbQ-Dzag==` 就是这个 ID，此时系统并不知道访问者是谁。

②：用户A打开自己的手机微信并扫描这个二维码，并提示用户是否确认登录。

③：手机上的微信是登录状态，用户点击确认登录后，手机上的微信客户端将微信账号和这个扫描得到的 ID 一起提交到服务器

④：服务器将这个 ID 和用户 A 的微信号绑定在一起，并通知网页版微信，这个 ID 对应的微信号为用户 A，网页版微信加载用户 A 的微信信息，至此，扫码登录全部流程完成<br>


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