<template><div><el-table:data="tableData":span-method="objectSpanMethod"border:header-cell-style="{ textAlign: 'center' }"><el-table-column prop="area" label="区域" align="center"></el-table-column><el-table-column prop="province" label="省份" align="center" /><el-table-column prop="month_1" label="一月" align="center" /><el-table-column prop="month_2" label="二月" align="center" /><el-table-column prop="month_3" label="三月" align="center" /></el-table></div>
</template>
<script>
export default {data() {return {// 表格数据tableData: [// 一年级{area: "华北",province: "北京",month_1: "100",month_2: "张三",month_3: "90"},{area: "华北",province: "北京",month_1: "200",month_2: "张三",month_3: "90"},{area: "华北",province: "山西",month_1: "100",month_2: "张三",month_3: "90"},{area: "华北",province: "辽宁",month_1: "100",month_2: "张三",month_3: "90"},{area: "东北",province: "吉林",month_1: "100",month_2: "张三",month_3: "90"},{area: "东北",province: "黑2",month_1: "100",month_2: "张三",month_3: "90"},{area: "东北",province: "黑2",month_1: "100",month_2: "张三",month_3: "90"},{area: "东北",province: "黑2",month_1: "100",month_2: "张三",month_3: "90"},{area: "西北",province: "黑2",month_1: "100",month_2: "张三",month_3: "90"},{area: "西北",province: "西二",month_1: "100",month_2: "张三",month_3: "90"},{area: "西北",province: "西三",month_1: "100",month_2: "张三",month_3: "90"},],};},methods: {/*** 分析每一列，找出相同的* @param data*/setTabelRowSpan(tableData, fieldArr, effectMerge = {}) {let lastItem = {}fieldArr.forEach((field, index) => {let judgeArr = fieldArr.slice(0, index + 1)if (effectMerge[field]) {judgeArr = [...effectMerge[field], field]}tableData.forEach(item => {item.mergeCell = fieldArrconst rowSpan = `rowspan_${field}`// 判断是否合并到上个单元格。if (judgeArr.every(e => lastItem[e] === item[e] && item[e] !== '')) {// 判断是否所在行的列对应的值全部相同，并且此列的值不为空// 是：合并行item[rowSpan] = 0lastItem[rowSpan] += 1} else {// 否：完成一次同类合并。lastItem重新赋值，进入下一次合并计算。item[rowSpan] = 1lastItem = item}})})},objectSpanMethod({ row, column, rowIndex, columnIndex }) {if (row.mergeCell.includes(column.property)) {const rowspan = row[`rowspan_${column.property}`]if (rowspan) {return { rowspan: rowspan, colspan: 1 }} else {return { rowspan: 0, colspan: 0 }}}}},mounted() {// 需要参照合并的列const effectMerge = {month_1: ['area'],month_3: ['area']}const arr = ['area', 'province', 'month_1', 'month_2', 'month_3']this.setTabelRowSpan(this.tableData, arr, effectMerge)
}
</script>
<style lang="scss" scoped></style>

效果图