npm i @xinglu/wxapp-oauth
## 实例化
```javascript
const config = {
appid: '小程序appid',
secret: '小程序secret'
};
// 实例化调用
const oauth = require('@xinglu/wxapp-oauth')(config);
let res = await oauth.api(...);
// 链式调用, 同一体系下多个小程序配置
const oauth = require('@xinglu/wxapp-oauth');
let res = await oauth(config).api(...);
let user = await oauth.getUser(code, encryptoData<可选>, iv<可选>);
// user: {openid, unionid, session_key, expires_in}
// user.userInfo: {openId, nickName, gender, language, city, province, country, avatarUrl, unionId, watermark}