Vue el-table 合并单元格

一般常见的就是下图这种的单列，上下重复进行合并。
在这里插入图片描述
有时候可能也会需要多行多列的合并。

<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><link rel="stylesheet" href="./assets/global.css"><!-- 引入样式 --><link rel="stylesheet" href="./assets/element-ui/lib/theme-chalk/index.css">
</head><body><div id="app"><el-table :data="tableData" :span-method="handleSpanMethod" border style="width: 100%"><el-table-column prop="id" label="ID" width="180"></el-table-column><el-table-column prop="name" label="姓名"></el-table-column><el-table-column prop="amount1" sortable label="数值 1"></el-table-column><el-table-column prop="amount2" sortable label="数值 2"></el-table-column><el-table-column prop="amount3" sortable label="数值 3"></el-table-column></el-table></div>
</body>
<!-- import Vue before Element -->
<script src="./assets/vue@2/dist/vue.js"></script>
<!-- import JavaScript -->
<script src="./assets/element-ui/lib/index.js"></script><script>new Vue({el: '#app',data: function () {return {tableData: [{id: '12987122',name: '王小虎',amount1: '234',amount2: '3.2',amount3: 10}, {id: '12987123',name: '王小虎',amount1: '165',amount2: '4.43',amount3: 12}, {id: '12987124',name: '王小丫',amount1: '324',amount2: '1.9',amount3: 9}, {id: '12987125',name: '王小丫',amount1: '621',amount2: '2.2',amount3: 17}, {id: '12987126',name: '王小丫',amount1: '539',amount2: '4.1',amount3: 15}]}},mounted() {},methods: {handleSpanMethod({ row, column, rowIndex, columnIndex }) {// console.log(this.mergeByName(this.tableData, 1));// return this.mergeByRectangle(0, 0, 0, 2)(columnIndex, rowIndex)// return this.mergeByRectangleList([[0, 0, 0, 1], [2, 0, 2, 1], [3, 3, 4, 4]])(columnIndex, rowIndex)return this.mergeByRectangleList(this.mergeByName(this.tableData, 1))(columnIndex, rowIndex)},/* 矩形合并单元格子* (sx,sy) 开始坐标* (ex,ey) 结束坐标*/mergeByRectangle(sx, sy, ex, ey) {return function (x, y) {if (x == sx && y == sy) {return {rowspan: (ey - sy) + 1,colspan: (ex - sx) + 1}}if (sx <= x && x <= ex && sy <= y && y <= ey) {return {rowspan: 0,colspan: 0}}}},/* 矩形合并单元格* @param {[[]]} arraylist*/mergeByRectangleList(arraylist) {const that = this;return function (x, y) {for (let i = 0; i < arraylist.length; i++) {const arr = arraylist[i];const res = that.mergeByRectangle(...arr)(x, y)if (res) return res}}},/* 通过名称计算合并单元格*/mergeByName(tableData, column) {let arraylist = []let sx = column;let sy = 0;let ex = column;let ey = 0;let c = 0;let i = 1;while (i < tableData.length) {const curr = tableData[c];const next = tableData[i]if (curr.name == next.name) {ey++;}if (curr.name != next.name || i == tableData.length - 1) {arraylist.push([sx, sy, ex, ey])c = isy = cey = c}i++;}return arraylist}}})</script></html>