1. 代码

<template><div><el-table border :span-method="arraySpanMethod" :data="tableData" style="width: 100%"><el-table-column prop="date" label="日期" width="180"></el-table-column><el-table-column prop="name" label="姓名" width="180"></el-table-column><el-table-column prop="address" label="地址"></el-table-column></el-table></div>
</template><script>
export default {data() {return {tableData: [{date: "2",name: "虎",address: "上海市普518 弄"},{date: "2",name: "虎",address: "上海陀区金沙江路7 弄"},{date: "2",name: "王",address: "上9 弄"},{date: "3",name: "王",address: "上海市普陀区金沙江路 1516 "},{date: "5",name: "王小",address: "陀区金沙江路 1518 弄"},{date: "4",name: "王小",address: "上海市517 弄"},{date: "2",name: "小虎",address: "上海市普陀区金沙路 1519 弄"},{date: "2",name: "小虎",address: "上海市普陀江路 1516 弄"}]};},created() {this.mergeYear(this.tableData);},methods: {mergeYear(arr) {let tempArr = [1],index = 0;arr.reduce((acc, cur, _index, _arr) => {if (acc.date !== cur.date) {tempArr[_index] = 1;index = _index;} else {tempArr[index]++;}return cur;});arr.forEach((ele, index) => {ele.rowspan = tempArr[index] || 0;});},arraySpanMethod({ row, column, rowIndex, columnIndex }) {if (columnIndex === 0) {return {rowspan: row.rowspan,colspan: 1};}}}
};
</script>