bw_smallApp/pages/login/login.js

const app = getApp()
Page({
  data: {
  },
  onLoad: function () {
      if (app.globalData.userInfo) {
        return;
      } else if (this.data.canIUse){
        // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
        // 所以此处加入 callback 以防止这种情况
        app.userInfoReadyCallback = res => {
          this.setData({
            userInfo: res.userInfo,
            hasUserInfo: true
          })
        }
      } else {
        // 在没有 open-type=getUserInfo 版本的兼容处理
        wx.getUserInfo({
          success: res => {
            wx.setStorageSync('userInfo', res.userInfo);
            app.globalData.userInfo = res.userInfo
          }
        })
      }
  },
  getUserInfo: function(e) {
      const errno = e.detail.errMsg;
      const that = this, userInfo = {};
      if (errno === "getUserInfo:fail auth deny") {
          return;
      }else{
          userInfo.encryptedData = e.detail.encryptedData;
          userInfo.iv = e.detail.iv;
          userInfo.avatar_url = e.detail.userInfo.avatarUrl;
          userInfo.nick_name = e.detail.userInfo.nickName;
          app.globalData.userInfo = userInfo;
          wx.setStorageSync('userInfo', userInfo);
          app.login(that);
      }
  },
})