Case study of dynamic data binding of this.$set in Vue

<template>
  <div>
    <!-- Single data -->
    <button @click="text0a">text0</button>
    <p>text0: {{text0}}</p>
    <!-- Object -->
    <button @click="textObja">textObj</button>
    <p>textObj.text1: {{textObj.text1}}</p>
    <!-- Array -->
    <button @click="textArra">textArr</button>
    <p>textArr[1]: {{textArr[1]}}</p>
    <!-- json data -->
    <button @click="textJsona">textJson</button>
    <p>textJson[1].t5: {{textJson[1].t5}}</p>
  </div>
</template>
<script>
export default {
  data() {
    return {
      text0: '',
      textObj: {},
      textArr: [],
      textJson:[
        {t0: ''},
        {t4: ''},
        {t7: ''},
      ]
    }
  },
  methods: {
    text0a: function () {
      let vm = this
      let text100 = 'efghjk'
      vm.$set(vm,'text0',text100) 
      //Equivalent to vm.$set(vm,'text0','efghjk')
    },
    textObja: function () {
      let vm = this
      let textObj100 = {
        text1: '123',
        text2: '456'
        }
      vm.$set(vm.textObj,'text1',textObj100.text1) 
      //This is equivalent to vm.$set(vm,'textObj',textObj100)
    },
    textArra: function () {
      let vm = this
      let textArr200 = ['a1','a2','a3']
      vm.$set(vm,'textArr',textArr200)
    },
    textJsona: function () {
      let vm = this
      let textJson300 = [
        {t1: 't1',t2: 't2',t3: 't3'},
        {t4: 't4',t5: 't5',t6: 't6'},
        {t7: 't7',t8: 't8',t9: 't9'},
      ]
      vm.$set(vm.textJson[1],'t5',textJson300[1].t5) 
      //This is equivalent to vm.$set(vm,'textJson',textJson300)
    }
  }
}
</script>
<style>
</style>

this.$set(dataName,keyName,keyValue)

export default {
 data:{
  //First define an empty object formObject:{},
  arrayList:[],
 },
 mounted() {
  this.initPage()
 },
 methods:{
  initPage(){
   this.$store.dispatch(namespace/callData).then(res=>{
    // Set key-value for the data
    res.data.forEach(item=>{
     // ❗❗❗❗❗ this.formObject[item.name] = item.value // ❗❗❗❗ This method cannot update the view this.$set(this.formObject, item.name, item.value) // ✅✅✅✅Can update the view})
   })
   // Modify the array this.$store.dispatch(namespace/callData).then(res=>{
    // Set key-value for the data
    this.$set(this.arrayList,0,(res.data)[0].id) ✅✅✅✅Can update the view})
  }
 }
}