<el-table-column:key="Math.random()"><templateslot="header"><el-dropdowntrigger="click":hide-on-click="false"><el-buttonicon="el-icon-setting"type="text"/><el-dropdown-menuslot="dropdown"style="width: 240px"><el-dropdown-itemv-for="col of cols":key="col.name"style="position: relative">          {{ col.label }}<el-switchv-model="tempValue"active-color="#13ce66"style="position:absolute; right:0; top: 8px"/></el-dropdown-item></el-dropdown-menu></el-dropdown></template></el-table-column>

<template#header>

beforeUpdate(){this.$nextTick(()=>{// 重新渲染表格，防止后渲染而出现格式抖动this.$refs['table'].doLayout()})}