el-table中type=“selection“选中数据如何回显

效果如下

代码如下

关键函数：toggleRowSelection(this.tableData[i])设置默认选中数据。

<template>
  <el-table
    ref="multipleTable"
    :data="tableData"
    tooltip-effect="dark"
    style="width: 100%"
    @selection-change="handleSelectionChange">
    <el-table-column
      type="selection"
      width="55">
    </el-table-column>
    <el-table-column
      label="日期"
      width="120">
      <template slot-scope="scope">{{ scope.row.date }}</template>
    </el-table-column>
    <el-table-column
      prop="name"
      label="姓名"
      width="120">
    </el-table-column>
    <el-table-column
      prop="address"
      label="地址"
      show-overflow-tooltip>
    </el-table-column>
  </el-table>
</template>
 
<script>
  export default {
    data() {
      return {
        tableData: [{
          date: '2016-05-03',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1518 弄'
        }, {
          date: '2016-05-02',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1518 弄'
        }],
        res:[{
          date: '2016-05-02',
          name: '王小虎',
          address: '上海市普陀区金沙江路 1518 弄'
        }],
        multipleSelection: []
      }
    },
    mounted(){
    this.init()
   },
    methods: {
      init() {
        //res数组正常是后台调用接口查询到的数据，为了更直观的展示，用假数据代替。
         this.$nextTick(() => {
          this.res.forEach(el=>{
           for(let i=0;i<this.tableData.length;i++){
            if(el.date==this.tableData[i].date){
               this.$refs.multipleTable.toggleRowSelection(this.tableData[i]);
            }
           } 
          })
        })       
      },
      handleSelectionChange(val) {
        this.multipleSelection = val;
      }
    }
  }
</script>