步骤一

 在<el-table>中:row-key="getRowKeys"和@selection-change="handleSelectionChange"

 在<el-table-column>中type="selection"那列，添加:reserve-selection="true"

<el-table
   :data="tableData"
   ref="multipleTable"
   border
   style="width: 100%"
   :row-key="getRowKeys"
   @selection-change="handleSelectionChange"
 >
    <el-table-column
        type="selection"
        width="55"
        :reserve-selection="true"
     >
     </el-table-column>
     <el-table-column type="index" label="序号" width="50">
     </el-table-column>
     <el-table-column prop="code" label="设备编号"> </el-table-column>
      <el-table-column prop="name" label="设备名称"> </el-table-column>
      <el-table-column prop="capacity" label="标准产能（kg/天）">
      </el-table-column>
      <el-table-column prop="shopName" label="车间"> </el-table-column>
      </el-table>

步骤二

methods: {
    getRowKeys(row) {
      return row.id;
    },
    handleSelectionChange(e) {
      console.log(e,"被选中数据")
      this.addDeviceData = e;
    },
}

提示

在开发过程中，示如我遇到的需求，<el-table> 展示在<el-dialog>弹框中。第二次点击近弹窗，要求数据不选择。那么可以在<el-dialog>弹框关闭时的事件中加上这行代码。

this.$refs.multipleTable.clearSelection(); //取消全部选中