const APP_ID ='';//输入小程序appid  

const APP_SECRET ='';//输入小程序app_secret  

var OPEN_ID=''//储存获取到openid  

var SESSION_KEY=''//储存获取到session_key  

Page({  

  getOpenIdTap:function(){  

    var that=this;  

    wx.login({  

      success:function(res){  

        wx.request({  

            //获取openid接口  

          url: 'https://api.weixin.qq.com/sns/jscode2session',  

          data:{  

            appid:APP_ID,  

            secret:APP_SECRET,  

            js_code:res.code,  

            grant_type:'authorization_code'  

          },  

          method:'GET',  

          success:function(res){  

            console.log(res.data)  

            OPEN_ID = res.data.openid;//获取到的openid  

            SESSION_KEY = res.data.session_key;//获取到session_key  

            console.log(OPEN_ID.length)