文档

README.md

@@ -154,6 +154,36 @@ following fields:
 | lang    | String | The user language                   |
 | country | String | The user country                    |
 
+#### authByScan([scope, nonceStr, timestamp, scope, signature, schemeData, callback]) 微信扫码授权登录
+
+- `appid` {String} the appid you get from WeChat dashboard
+- `nonceStr` 
+- `timestamp`
+- `scope` 写死 snsapi_userinfo 即可 
+- `signature` 签名
+- `schemeData` 留空即可
+- `callback` (object) => void
+
+调用 authByScan 后，需要监听二维码的获取，展示完二维码，用户扫码登录完成后才会回调 callback，字段如下
+
+| field   | type   | description                         |
+| ------- | ------ | ----------------------------------- |
+| errCode | Number | Error Code                          |
+| authCode  | String | Auth Code |
+
+
+如何监听二维码的获取呢？如下示例，拿到二维码的本地图片链接后，使用 Image 等标签进行展示即可
+
+```js
+const qrcodeEmitter = new NativeEventEmitter(NativeModules.WeChat);
+
+const subscription = qrcodeEmitter.addListener('onAuthGotQrcode', (res) =>
+  console.log(res.qrcode)
+);
+```
+
+如有不懂，可以查看[微信官方文档](https://developers.weixin.qq.com/doc/oplatform/Mobile_App/WeChat_Login/Login_via_Scan.html)
+
 #### ShareText(ShareTextMetadata) 分享文本
 
 ShareTextMetadata