微信小程序获取用户openid的实现

//app.js
App({
  globalData:{
    appid:'1wqas2342dasaqwe2323424ac23qwe',//appid需自己提供，此处的appid我随机编写
    secret:'e0dassdadef2424234209bwqqweqw123ccqwa',//secret需自己提供，此处的secret我随机编写
 
  },
  onLaunch: function () {
   var that = this
   var user=wx.getStorageSync('user') || {}; 
   var userInfo=wx.getStorageSync('userInfo') || {}; 
   if((!user.openid || (user.expires_in || Date.now()) < (Date.now() + 600))&&(!userInfo.nickName)){ 
    wx.login({ 
    success: function(res){ 
      if(res.code) {
        wx.getUserInfo({
          success: function (res) {
            var objz={};
            objz.avatarUrl=res.userInfo.avatarUrl;
            objz.nickName=res.userInfo.nickName;
            //console.log(objz);
            wx.setStorageSync('userInfo', objz);//存储userInfo
          }
        });
        var d=that.globalData;//这里存储了appid、secret、token串 
        var l='https://api.weixin.qq.com/sns/jscode2session?appid='+d.appid+'&secret='+d.secret+'&js_code='+res.code+'&grant_type=authorization_code'; 
        wx.request({ 
          url: l, 
          data: {}, 
          method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT 
          // header: {}, // 设置请求的 header 
          success: function(res){ 
            var obj={};
            obj.openid=res.data.openid; 
            obj.expires_in=Date.now()+res.data.expires_in; 
            //console.log(obj);
            wx.setStorageSync('user', obj);//存储openid 
          } 
        });
      }else {
        console.log('获取用户登录态失败！' + res.errMsg)
      }     
    } 
   }); 
  } 
  },
})