vxe-table开启服务端排序，并记录排序高亮状态

    <price-tree-table
        :key="tableKey"
        ref="topTableRef"
        :isLoading="topTableLoading"
        :tableData="topTableData"
        :tableHeaderList="tableHeaderList"
        :sortConfig="sortConfig"
        @sortChange="tableSortChange"
        @clickTableRow="topTableRowClick"
    />

    computed: {
     //表格排序配置项（只会在表格初始化时被触发一次）所以每次触发排序要更新table-key 重新渲染表格
        sortConfig() {
            let obj = {
                remote: true,//开启服务端排序
                defaultSort: { 
                    field: this.sortField,
                    order: this.sortBy
                }
            }
            return obj
        }
    },
    methods: {
        tableSortChange({field, order}) {
            this.tableKey = Math.random();
            this.sortField = field
            this.sortBy = order;
            this.getPriceTableData();
        },
    }