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']