vue+element-ui 点击表格某一行，展开内容

正常情况下，表格中想要展开某一行只能通过点击最前面的小箭头，如果想要实现点击某一行后直接展开，那么首先，就要先了解这几个属性：

　　row-key的值只能是表格中某一列的key，而expand-row-keys数组里保存的则是所有展开行的row-key值，假如设置row-key=“id”,那么expand-row-keys数组里则保存的是表格中所有展开行的id值。

<template>
  <el-table :data="tableData" row-key="id" :expand-row-keys="expands" @row-click="rowClick" style="width: 100%">
    <el-table-column type="expand">
      <template slot-scope="props">
        <el-form label-position="left" inline class="demo-table-expand">
          <el-form-item label="商品名称">
            <span>{{ props.row.name }}</span>
          </el-form-item>
          <el-form-item label="所属店铺">
            <span>{{ props.row.shop }}</span>
          </el-form-item>
          <el-form-item label="商品 ID">
            <span>{{ props.row.id }}</span>
          </el-form-item>
          <el-form-item label="店铺 ID">
            <span>{{ props.row.shopId }}</span>
          </el-form-item>
          <el-form-item label="商品分类">
            <span>{{ props.row.category }}</span>
          </el-form-item>
          <el-form-item label="店铺地址">
            <span>{{ props.row.address }}</span>
          </el-form-item>
          <el-form-item label="商品描述">
            <span>{{ props.row.desc }}</span>
          </el-form-item>
        </el-form>
      </template>
    </el-table-column>
    <el-table-column label="商品 ID" prop="id"></el-table-column>
    <el-table-column label="商品名称" prop="name"></el-table-column>
    <el-table-column label="描述" prop="desc"></el-table-column>
  </el-table>
</template>
<style>
.demo-table-expand {
  font-size: 0;
}
.demo-table-expand label {
  width: 90px;
  color: #99a9bf;
}
.demo-table-expand .el-form-item {
  margin-right: 0;
  margin-bottom: 0;
  width: 50%;
}
</style>

<script>
export default {
  data() {
    return {
      tableData: [
        {
          id: '12987122',
          name: '好滋好味鸡蛋仔',
          category: '江浙小吃、小吃零食',
          desc: '荷兰优质淡奶，奶香浓而不腻',
          address: '上海市普陀区真北路',
          shop: '王小虎夫妻店',
          shopId: '10333'
        },
        {
          id: '12987123',
          name: '好滋好味鸡蛋仔',
          category: '江浙小吃、小吃零食',
          desc: '荷兰优质淡奶，奶香浓而不腻',
          address: '上海市普陀区真北路',
          shop: '王小虎夫妻店',
          shopId: '10333'
        },
        {
          id: '12987125',
          name: '好滋好味鸡蛋仔',
          category: '江浙小吃、小吃零食',
          desc: '荷兰优质淡奶，奶香浓而不腻',
          address: '上海市普陀区真北路',
          shop: '王小虎夫妻店',
          shopId: '10333'
        },
        {
          id: '12987126',
          name: '好滋好味鸡蛋仔',
          category: '江浙小吃、小吃零食',
          desc: '荷兰优质淡奶，奶香浓而不腻',
          address: '上海市普陀区真北路',
          shop: '王小虎夫妻店',
          shopId: '10333'
        }
      ],
      expands: []
    }
  },
  methods: {
    //在<table>里，我们已经设置row的key值设置为每行数据id：row-key="id"
    rowClick(row, event, column) {
      if (this.expands.indexOf(row.id) < 0) {
        this.expands.push(row.id)
      } else {
        this.expands.remove(row.id)
      }
      console.log(this.expands) // ['12987122','12987123']
    }
  }
}
</script>

运行结果输出expands数组为['12987122','12987123']