The vue view is not updated, do you need to clear it and then set it up before updating?

this.$children.map(item=>{
          if(item.list){
            let temp = clearCheckItem(item.list)
            // this.$store.commit("SET_MATCHLIST",[])
            this.$store.commit("SET_MATCHLIST",temp)
            // item.$set(item,"list",[])
            item.$set(item,"list",this.ffzmatchlist)
          }
        })

the code view above is not updated, but the data is updated 

this.$children.map(item=>{
          if(item.list){
            let temp = clearCheckItem(item.list)
            this.$store.commit("SET_MATCHLIST",[])
            this.$store.commit("SET_MATCHLIST",temp)
            item.$set(item,"list",[])
            item.$set(item,"list",this.ffzmatchlist)
          }
        })

Why is it useful to empty it and then set it up? Is this usage of
correct?
do you have any other ways to use it?

Vue.js javascript
Nov.29,2021 
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <script src="https://cdn.bootcss.com/vue/2.5.17-beta.0/vue.min.js"></script>
    <title>Document</title>
  </head>
  <body>
    <div id="app">
      <div v-for="(item,index) in value1" :key="index">
        <div v-for="(inner,idx) in item.list" :key="idx">{{ inner }}</div>
      </div>
      <button @click="changeValue"></button>
    </div>
    <script>
      new Vue({
        el: "-sharpapp",
        data() {
          return {
            value1: [
              {
                list: [1, 2, 3]
              },
              {
                list: [4, 5, 6]
              }
            ]
          };
        },
        methods: {
          changeValue() {
            this.value1.map(item => {
              this.$set(item, "list", [7, 8, 9]);
            });
          }
        }
      });
    </script>
  </body>
</html>

wrote a demo, you see, it can be modified and updated with the view. Where should you write wrong

Previous: How to make the ts check that comes with vscode recognize the double colon operator

Next: The essential difference between relational and non-relational databases?

css mysql arrays josn react html typescript webpack npm sass R objective-c .net sql-server jquery python-3.x angularjs django angular excel regex iphone ajax linux xml pandas vba spring database wordpress string wpf xcode windows bash postgresql oracle multithreading eclipse list firebase algorithm macos forms image scala visual-studio azure bootstrap spring-boot react-native python-2.7 docker performance function winforms matlab powershell apache dataframe api sqlite numpy rest shell selenium flutter dart maven loops qt swing android-studio csv express file class tensorflow sorting codeigniter perl
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bf37cc-31e84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf37cc-31e84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?