elementUI table合并相同数据的单元格

<template>
    <div>
        <el-table :data="tableData4" :span-method="objectSpanMethod" border>
            <el-table-column prop="id" label="11" width="180">
            </el-table-column>
            <el-table-column prop="name" label="22">
            </el-table-column>
            <el-table-column prop="amount1" label="33">
            </el-table-column>
            <el-table-column prop="amount2" label="44">
            </el-table-column>
            <el-table-column prop="amount3" label="55">
            </el-table-column>
            <el-table-column prop="amount3" label="66">
            </el-table-column>
            <el-table-column prop="amount3" label="77">
            </el-table-column>
            <el-table-column prop="amount3" label="88">
            </el-table-column>
            <el-table-column prop="amount3" label="99">
            </el-table-column>
        </el-table>
    </div>
</template>
<script>
import moment from "moment";

export default {


    methods: {

        objectSpanMethod({ row, column, rowIndex, columnIndex }) {

            if (columnIndex === 0) {

                const _row = this.spanArr[rowIndex]

                const _col = _row > 0 ? 1 : 0;

                return {

                    rowspan: _row,

                    colspan: _col

                }

            }

            if (columnIndex === 1) {

                const _row = this.spanArr[rowIndex]

                const _col = _row > 0 ? 1 : 0;

                return {

                    rowspan: _row,

                    colspan: _col

                }

            }

        }

    },

    mounted: function() {

        let contactDot = 0;

        this.tableData4.forEach((item, index) => {

            item.index = index;

            if (index === 0) {

                this.spanArr.push(1);

            } else {

                if (item.id === this.tableData4[index - 1].id) {

                    this.spanArr[contactDot] += 1;

                    this.spanArr.push(0);

                } else {

                    this.spanArr.push(1);

                    contactDot = index;

                }

            }

        });

    },

    data() {

        return {

            spanArr: [],

            tableData4: [

                {

                    id: "12987122",

                    name: "王小虎",

                    amount1: "234",

                    amount2: "3.2",

                    amount3: 10

                },

                {

                    id: "12987122",

                    name: "王小虎",

                    amount1: "165",

                    amount2: "4.43",

                    amount3: 12

                },

                {

                    id: "你好",

                    name: "王小虎",

                    amount1: "324",

                    amount2: "1.9",

                    amount3: 9

                },

                {

                    id: "你好",

                    name: "王小虎",

                    amount1: "621",

                    amount2: "2.2",

                    amount3: 17

                },

                {

                    id: "你好",

                    name: "王小虎",

                    amount1: "621",

                    amount2: "2.2",

                    amount3: 17

                },

                {

                    id: "你",

                    name: "王小虎",

                    amount1: "621",

                    amount2: "2.2",

                    amount3: 17

                },

                {

                    id: "你",

                    name: "王小虎",

                    amount1: "621",

                    amount2: "2.2",

                    amount3: 17

                },

                {

                    id: "你",

                    name: "王小虎",

                    amount1: "539",

                    amount2: "4.1",

                    amount3: 15

                },

                {

                    id: "他",

                    name: "王小虎",

                    amount1: "539",

                    amount2: "4.1",

                    amount3: 15

                }

            ],

            formLabelWidth: "90px"

        };

    },

    computed: {},

    beforeMount: function() {},

};
</script>