获取三级菜单的值

<el-tree
      :data="menus"
      :props="defaultProps"
      show-checkbox="true"
      node-key="catId"
      :default-expand-all="false"
      :expand-on-click-node="false"
      :default-expanded-keys="expandedkeys"
      :draggable="draggable"
      :allow-drop="allowDrop"
      @node-drop="handleDrop"
      ref="menuTree"
    >
      <!-- node: 当前节点（包括节点的各种属性）  data：后台传递的节点数据， slot-scope卡槽机制 -->
      <span class="custom-tree-node" slot-scope="{ node, data }">
        <span>{{ node.label }}</span>
        <span>
          <el-button v-if="node.level <= 2" type="text" size="mini" @click="() => append(data)">增加</el-button>
          <!-- 也可以这样写事件： @click="edit(data)  或者  @click="() => append(data) -->
          <el-button type="text" size="mini" @click="edit(data)">修改</el-button>
          <el-button
            v-if="node.childNodes.length == 0"
            type="text"
            size="mini"
            @click="() => remove(node, data)"
          >删除</el-button>
        </span>
      </span>
    </el-tree>

获取表格中每一行的数据

slot-scop 插槽机制 scope可以获取到 row, column, $index 和 store（table 内部的状态管理）的数据

<el-table
    :data="tableData"
    style="width: 100%">
    <el-table-column
      label="日期"
      width="180">
      <!--slot-scop 插槽机制  scope可以获取到 row, column, $index 和 store（table 内部的状态管理）的数据-->
      <template slot-scope="scope">
        <i class="el-icon-time"></i>
        <span style="margin-left: 10px">{{ scope.row.date }}</span>
      </template>
    </el-table-column>
    <el-table-column
      label="姓名"
      width="180">
      <template slot-scope="scope">
        <el-popover trigger="hover" placement="top">
          <p>姓名: {{ scope.row.name }}</p>
          <p>住址: {{ scope.row.address }}</p>
          <div slot="reference" class="name-wrapper">
            <el-tag size="medium">{{ scope.row.name }}</el-tag>
          </div>
        </el-popover>
      </template>
    </el-table-column>
    <el-table-column label="操作">
      <template slot-scope="scope">
        <el-button
          size="mini"
          @click="handleEdit(scope.$index, scope.row)">编辑</el-button>
        <el-button
          size="mini"
          type="danger"
          @click="handleDelete(scope.$index, scope.row)">删除</el-button>
      </template>
    </el-table-column>
  </el-table>