vue实现分页功能

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

data（）{
return{
   tableData: [],
        total: 0,//总数
        pageNum: 1,//当前页
        pageSize: 15,//每页显示数量
}
}
  mounted: function () {
      this.query();//加载页面时，获取数据
    },
    methods:{
       //切换页码
        changePageNum: function (val) {
        this.pageNum = val;
        this.query();
      },
      //通过接口，获取数据
    query: function () {
        var data = {
          name: this.name || '',
          fleetId: this.FleetId,
          pageNum: this.pageNum,//当前页
          pageSize: this.pageSize//查询个数
        };
        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('查询失败');
          }
        }).catch(err => {
          // 异常情况
          console.log(err);
        });
      },
      }

//调度-系统通讯录分页
        dispatchCourentPage: 1,
        //调度-系统通讯录当前选中标签标记
        dispatchCourentIndex: 1,
        //调度-系统通讯录更多标记项:组id
        dispatchMorecommandGroupId: '',
        dispatchTotlePage: 0,
//上页
 handleLastPage() {
        if (this.dispatchCourentPage === 1) return;
        this.dispatchCourentPage -= 1;
        let index = this.dispatchCourentIndex;
        if (this.dispatchMorecommandGroupId != '') {
          this.queryBookMoreBygroupId(this.dispatchMorecommandGroupId);
        } else {
          this.queryBookmember(index);
        }
      },
//下页
 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;
      },
            // 因为要动态计算总页数，所以还需要一个计算属性来返回最终给 Table 的 data
      dataWithPage() {
        const data = this.limitData;
        const start = this.current * this.size - this.size;
        const end = start + this.size;
        return [...data].slice(start, end);
      },
  }

/**
   *根据数据条数与每页多少条数据计算页数 
   * totalnum 数据条数
   * limit 每页多少条
  */
 pageCount(totalnum, limit) {
     return totalnum > 0 ? ((totalnum < limit) ? 1 : ((totalnum % limit)
        ? (parseInt(totalnum / limit) + 1)
         : (totalnum / limit))) : 0;
 },

/**
   * 分页的总页数算法
   * 总记录数：totalRecord
   * 每页最大记录数：maxResult
 */
 function pageCount() {
     totalPage = (totalRecord + maxResult -1) / maxResult;
}

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