template部分代码:
<el-table
ref="multipleTable"
:data="tableData"
style="width: 100%"
:row-key="(row)=>{ return row.id}"
:reserve-selection="true"
@selection-change="handleSelectionChange">
<el-table-column
type="selection"
:reserve-selection="true"
width="55">
</el-table-column>
</el-table>
:row-key="(row)=>{ return row.id}" //给每一项添加一个key 做上标记
:reserve-selection="true" //在数据更新之后保留之前选中的数据 这个属性必要要结合row-key