How can vue + element achieve full selection in groups? ask the boss for help.

problem description: vue+element is used to make the select all buttons in groups do not affect each other

html section:

<el-form-item label=":">
    <el-checkbox :indeterminate="isIndeterminate" v-model="checkAll" @change="handleCheckAllChange"></el-checkbox>
      <div style="margin: 10px 0;"></div>
    <div v-for="(city, group_index) in cities">
    <span>{{city.label}}</span>
    <el-checkbox style="margin-left:30px;" :indeterminate="isIndeterminate" v-model="checkPart" @change="checkPartChange(checkPart, group_index)"></el-checkbox>
    <el-checkbox-group v-model="checkedCities" @change="handleCheckedCitiesChange">
    <el-checkbox v-for="a in city.children" :label="a.value">{{a.label}}</el-checkbox>
    </el-checkbox-group>
    </div>
</el-form-item>

vue.js section:

export default {
    data(){
        return{
            checkAll: false,
            checkPart:false,
            checkedCities: [],
            cities:[
              {
              value:"1",
              label:"",
              children:[
                {value: "1", label: "1",},
                {value: "2", label: "2",},
                {value: "3", label: "3",},
              ]
            },
              {
                value:"2",
                label:"",
                children:[
                  {value: "4", label: "4",},
                  {value: "5", label: "5",},
                  {value: "6", label: "6",},
                ]
              },
              {
                value:"3",
                label:"",
                children:[
                  {value: "7", label: "7",},
                  {value: "8", label: "8",},
                  {value: "9", label: "9",},
                ]
              },
            ],
            isIndeterminate: true
        
        }
    },
    methods:{
        checkPartChange(val,group_index){
        var group_val = []
        var city = this.cities[group_index].children
        if(val){
          for(var i = 0; i<city.length; iPP){
            group_val[i] = city[i]["value"]
          }
        }
        this.checkedCities = group_val;
        this.isIndeterminate = false;
      },
    }
}
:

clipboard.png

Mar.13,2021
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-64f5-1b35b32-2bfc0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b35b32-2bfc0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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