为什么我js文件中的data赋值异常？

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先放出相关JS代码和wxml代码js代码onLoad: function (options) {  var that=this;        wx.request({          url: 'http://81.68.72.54/index/Perso/person3',           method: 'POST',          success: function(res) {            console.log(res)//第一行注释            for (let i = 0; i < res.data.length; i++) {              var num=res.data[i].realtimees.data[i].capacity*100              num=num.toFixed(1)              res.data[i].percent=num              console.log(res.data[i])// 第二行注释              that.setData({                array:res.data              })              console.log(that.data.array)// 第三行注释            }          }        })}wxml代码   <view style="color:red;float: left;">当前人数：{{item.percent}}</view>z在循环结束后，我们打印第三行注释的结果可以看出，已经成功赋值

First release the relevant JS code and wxml code. JS code onload: function (options) {var that = this wx.request ({          url: ' http://81.68.72.54/index/Perso/person3 ',           method: 'POST',           success: function(res) {             console.log (RES) / / the first line comments for (let I = 0; I < 0 res.data.length ;  i++) {              var num= res.data [i].realtime/ res.data [i].capacity*100              num= num.toFixed (1)               res.data [i].percent=num               console.log ( res.data [i])// Comment on the second line that.setData ({                 array:res.data               })               console.log ( that.data.array ）//The third line comments}}}} wxml code < view style=“ color:red;float : left; "> current number of people:{{ item.percent }}< / View > Z at the end of the loop, we print the result of the third line of comment. We can see that the value has been assigned successfully, but null is always displayed in the front end. At the same time, appdata in the debugger is always displayed as null. The print result of the debugger's console shows that that.data.array (data The array in the previous screenshot has been updated, but the front end is displayed as null, and the normal number has only been successfully displayed once before, that is, 5113 at the corresponding position in the previous screenshot. Why is this

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