elementui表格选中后翻页缓存

在el-table加上:row-key=“row => row.id”，el-table-column上加:reserve-selection=“true”，就可以实现
id作为选中打印出来得值

<el-table
	ref="multipleTable"
	@selection-change="handleSelectionChange"
    @select-all="handleSelectAll"
  :row-key="row => row.id"
>
  <el-table-column
    type="selection"
    :reserve-selection="true"
  >
  </el-table-column>
</el-table>

// 点击选中会存入multipleSelection，在SelectAll时会触发该方法
  handleSelectionChange(val) {
      this.multipleSelection = val
  },

// 选中所有
 handleSelectAll(val) {
     this.multipleSelection = val
 },

清空缓存已选中项

this.$refs.multipleTable.clearSelection()

注意：在执行完操作之后要清除选中，表格不会自动清除