業(yè)務(wù)場(chǎng)景：表格有”發(fā)布時(shí)間“一列，發(fā)布時(shí)間可以點(diǎn)擊上下箭頭排序（和后臺(tái)交互排序所有數(shù)據(jù)，非當(dāng)前表格里的幾條）。
html:

<el-table :data="tableData" style="width: 100%" @sort-change="sortChange">
    <!--   sortable="custom"很重要   -->
    <el-table-column prop="publishTime" sortable="custom" label="發(fā)布時(shí)間" > </el-table-column>
</el-table>

js:

sortChange(column) {
            //打印可以分別得到上下箭頭的數(shù)據(jù)
            console.log(column);
            if (column.order == "ascending") {
                this.orderBy = "+";//根據(jù)自己的業(yè)務(wù)需求來(lái)
            } else if (column.order == "descending") {
                this.orderBy = "-";
            } else {
                this.orderBy = "";
            }
            //有多列排序時(shí)會(huì)用到
            // if (column.prop == "publishTime") {
            //     this.key = "publish_time ";
            // }  else if (column.prop == "updateTime") {
            //     this.key = "update_time";
            // } else {
            //     this.key = "";
            // }
            this.currentPage = 1;
            this.searchData();//查詢列表方法
        },