Vue implements paging function

<el-pagination
     layout="prev, pager, next"
     @current-change="changePageNum"
     :current-page="pageNum"
     :page-size="pageSize"
     :total="total">
</el-pagination>

data(){
return {
   tableData: [],
        total: 0, //Total number pageNum: 1, //Current page pageSize: 15, //Number of pages displayed per page}
}
  mounted: function () {
      this.query(); //Get data when loading the page},
    methods:{
       //Switch page numberchangePageNum: function (val) {
        this.pageNum = val;
        this.query();
      },
      //Get data through the interface query: function () {
        var data = {
          name: this.name || '',
          fleetId: this.FleetId,
          pageNum: this.pageNum, //Current page pageSize: this.pageSize //Query number};
        RoleManage.getRole(data)
        .then(res => {
          var data = res;
          if (res.success) {
            this.tableData = data.obj.list;
            this.total = data.obj.total;
            this.name = '';
          } else {
            this.$message('Query failed');
          }
        }).catch(err => {
          // Abnormal situation console.log(err);
        });
      },
   
      }

//Scheduling - system address book paging dispatchCourentPage: 1,
        //Scheduling - System Address Book currently selected tag mark dispatchCourentIndex: 1,
        //Scheduling-system address book more mark items: group id
        dispatchMorecommandGroupId: '',
        dispatchTotlePage: 0,
//Previous page handleLastPage() {
        if (this.dispatchCourentPage === 1) return;
        this.dispatchCourentPage -= 1;
        let index = this.dispatchCourentIndex;
        if (this.dispatchMorecommandGroupId != '') {
          this.queryBookMoreBygroupId(this.dispatchMorecommandGroupId);
        } else {
          this.queryBookmember(index);
        }
      },
//Next page handleNextPage() {
   if (this.dispatchCourentPage === this.dispatchTotlePage) return;
   this.dispatchCourentPage += 1;
   let index = this.dispatchCourentIndex;
   if (this.dispatchMorecommandGroupId != '') {
     this.queryBookMoreBygroupId(this.dispatchMorecommandGroupId);
   } else {
     this.queryBookmember(index);
   }

 }

computed: {
      limitData() {
        let data = [...this.table1Datas];
        return data;
      },
            // Because the total number of pages needs to be calculated dynamically, a calculated property is also required to return the final data to the Table
      dataWithPage() {
        const data = this.limitData;
        const start = this.current * this.size - this.size;
        const end = start + this.size;
        return [...data].slice(start, end);
      },
  }

/**
   *Calculate the number of pages based on the number of data items and the number of data items per page* totalnum number of data items* limit number of data items per page*/
 pageCount(totalnum, limit) {
     return totalnum > 0 ? ((totalnum < limit) ? 1 : ((totalnum % limit)
        ? (parseInt(totalnum / limit) + 1)
         : (totalnum / limit))) : 0;
 },

/**
   * Total number of pages for paging* Total number of records: totalRecord
   * Maximum number of records per page: maxResult
 */
 function pageCount() {
     totalPage = (totalRecord + maxResult -1) / maxResult;
}

totalPage = Math.floor((totalRecord +maxResult -1) /maxResult );