问题：勾选的数据分页再回来回消失

1.在el-table中加 :row-key="getRowKey"

const getRowKey = (row) => {

return row.id; // id必须是唯一的

};

2.给type为selection的el-table-column添加上reserve-selection属性

   <el-table
       ref="multipleTableRef"
       border
       :data="data.rows"
       @selection-change="handleSelectionChange"
       v-loading="data.dataListLoading"
       element-loading-text="数据加载中..."
       :row-key="getRowKey"
    >
    <el-table-column type="selection" reserve-selection width="55" />
   </el-table>

   const getRowKey = (row) => {
    return row.id;
   };