//app.js
App({
  globalData: { },

  onLaunch: function() {
    },
  //获取openid，由于网络延时，通常在其他页onload之后才会success,所以从其他页传回调函数cb进来。
  getopenid: function(cb) { 
    if (this.globalData.openid) {
      typeof cb == "function" && cb(this.globalData.openid)
    } else {
      var that = this
      wx.cloud.callFunction({
        name: ‘login‘,
        data: {},
        success: res => {
          //闭包函数内，可以用this,而不需要用that=this
          that.globalData.openid = res.result.openid
          typeof cb == "function" && cb(that.globalData.openid)
        },
        fail: err => {
          wx.showToast({
            icon: ‘none‘,
            title: ‘获取 openid 失败，请检查 login 云函数‘,
          })
          console.log(‘[云函数] [login] 获取 openid 失败，请检查是否有部署云函数，错误信息：‘, err)
        },
      })

    }
  },

})

  onLoad: function(options) {
    //设置回调，防止小程序globalData拿到数据为null     
    let that = this;
    app.getopenid(that.cb)

  },
  cb: function(res) {
    let that = this
    console.log("write cb res", res)
    that.setData({
      openid: res
    })
  },

  onLoad: function(options) {
    //设置回调，防止小程序globalData拿到数据为null    
    app.getopenid(res => {
      console.log("write cb res", res)
      this.setData({
        openid: res
      })
    })
  },