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需求描述

当 table 内容过多的时候，页面上滑滚动，表头的信息也会随着被遮挡，无法将表头信息和表格内容对应起来，需要进行表头吸顶

开始编码💪

环境：vue2.6+、element UI
step1： 给el-table__header-wrapper加上样式

//style/sticky-table-header.scss.el-table[is-sticky] {overflow: initial;--sticky-top: 0px;--stick-zIndex: 5;.el-table__header-wrapper{position: sticky;top: var(--sticky-top);z-index: var(--stick-zIndex);}.el-table__fixed, .el-table__fixed-right{overflow: visible;z-index: var(--stick-zIndex);.el-table__fixed-header-wrapper {position: sticky;top: var(--sticky-top);width: 100%;overflow: hidden;z-index: var(--stick-zIndex);}.el-table__fixed-body-wrapper {width: 100%;overflow: hidden;}}.el-table__fixed-right {.el-table__fixed-header-wrapper {display: flex;justify-content: flex-end;}.el-table__fixed-body-wrapper {display: flex;justify-content: flex-end;}}&.el-table--border::after{z-index: var(--stick-zIndex);}
}.el-table__fixed {--box-shadow: 10px 0 10px -10px rgba(0, 0, 0, 0.12);
}.el-table__fixed-right {--box-shadow: -10px 0 10px -10px rgba(0, 0, 0, 0.12);
}.el-table__fixed, .el-table__fixed-right {box-shadow: var(--box-shadow);
}

step2： 注册指令 directives/sticky-header.js

import '@/styles/sticky-table-header.scss'export default {bind(el, binding) {el.setAttribute('is-sticky', true)updateStickyTop(el, binding)},update(el, binding) {updateStickyTop(el, binding)}
}const updateStickyTop = (el, binding) => {const { value, oldValue } = bindingif (value === oldValue) returnconst top = Number(value)if (!isNaN(top)) {el.style.setProperty('--sticky-top', `${top}px`)}
}

step3： main.js 引入

import StickyTableHeader from './directives/sticky-header'
Vue.directive('sticky-table-header', StickyTableHeader)

step4： table.vue

<template><div class="wrapper"><h3>纯CSS表格吸顶</h3><el-radio-group v-model="mode" aria-hidden="true" class="options"><el-radio label="normal">正常模式</el-radio><el-radio label="fixedLeft">固定左边列</el-radio><el-radio label="fixedRight">固定右边列</el-radio><el-radio label="fixedLeftRight">固定左右列</el-radio></el-radio-group><el-tablev-sticky-table-header="0"border:data="tableData"><el-table-column label="日期" prop="date" min-width="150" :fixed="fixedLeft" /><el-table-column label="姓名" prop="name" width="120" /><el-table-column label="省份" prop="province" width="120" /><el-table-column label="市区" prop="city" width="120" /><el-table-column label="地址" prop="address" width="300" /><el-table-column label="邮编" prop="zip" min-width="120" :fixed="fixedRight" /></el-table></div>
</template><script>
export default {name: 'CSSFixedTopTable',components: {},data() {const tableData = new Array(100).fill(0).map((_, index) => {return {date: '2016-05-03',name: '王小虎',province: '上海',city: '普陀区',address: `上海市普陀区金沙江路 ${1 + index} 弄`,zip: 2000001 + index}})return {tableData,mode: 'normal'}},computed: {fixedLeft() {return /left/i.test(this.mode) ? 'left' : null},fixedRight() {return /right/i.test(this.mode) ? 'right' : null}},methods: {}
}
</script><style lang="scss" scoped>
.wrapper {width: 800px;margin: 0 auto;.options {width: 100%;margin: 30px 0;text-align: left;}
}
</style>

❗️❗️❗️父元素不要有 overflow: hidden;会失效

step5： 效果呈现🤩