wx.setStorage({
   key: 'myData',
   data: res.data.data
})

var that = this;
  wx.getStorage({
   key: 'myData',
   success: function (res) {
    var myData = res.data;//读取key值为myData的缓存数据
    that.setData({//拿到缓存中的数据并渲染到页面
     userName: myData.user.truename,
     schoolName: myData.school.name,
     className: myData.user.className,
   }
})