解释以下代码<el-button size="mini" @click="handleEdit({row})">Edit</el-button> 为什么row要加大括号

在Vue模板中，当我们需要在属性值中使用JavaScript表达式时，我们需要使用花括号（即“Mustache”语法）将表达式括起来。在这个例子中，row被用作@click事件处理程序的参数，因此需要将它放在花括号中以将其作为表达式传递。如果没有将row放在花括号中，它将被视为字符串并传递给事件处理程序，而不是作为一个对象。

因此，正确的模板代码应该是这样的：

<el-button size="mini" @click="handleEdit({row})">Edit</el-button>

在这个示例中，我们将row对象作为参数传递给handleEdit方法，以便在事件处理程序中访问该行的数据。

相关问题

将以下vue+element ui代码转换成纯html+element ui代码：<template> <el-tabs v-model="activeName" class="demo-tabs" @tab-click="handleClick"> <el-tab-pane label="User" name="first"> <el-table :data="filterTableData" style="width: 100%"> <el-table-column label="Date" prop="date" /> <el-table-column label="Name" prop="name" /> <el-table-column align="right"> <template #header> <el-input v-model="search" size="small" placeholder="Type to search" /> </template> <template #default="scope"> <el-button size="small" @click="handleEdit(scope.$index, scope.row)" >Edit</el-button > <el-button size="small" type="danger" @click="handleDelete(scope.$index, scope.row)" >Delete</el-button > </template> </el-table-column> </el-table> </el-tab-pane> <el-tab-pane label="Config" name="second"> <el-table :data="filterTableData" style="width: 100%"> <el-table-column label="Date" prop="date" /> <el-table-column label="Name" prop="name" /> <el-table-column align="right"> <template #header> <el-input v-model="search" size="small" placeholder="Type to search" /> </template> <template #default="scope"> <el-button size="small" @click="handleEdit(scope.$index, scope.row)" >Edit</el-button > <el-button size="small" type="danger" @click="handleDelete(scope.$index, scope.row)" >Delete</el-button > </template> </el-table-column> </el-table></el-tab-pane> <el-tab-pane label="Role" name="third"> <el-table :data="filterTableData" style="width: 100%"> <el-table-column label="Date" prop="date" /> <el-table-column label="Name" prop="name" /> <el-table-column align="right"> <template #header> <el-input v-model="search" size="small" placeholder="Type to search" /> </template> <template #default="scope"> <el-button size="small" @click="handleEdit(scope.$index, scope.row)" >Edit</el-button > <el-button size="small" type="danger" @click="handleDelete(scope.$index, scope.row)" >Delete</el-button > </template> </el-table-column> </el-table></el-tab-pane> <el-tab-pane label="Task" name="fourth"> <el-table :data="filterTableData" style="width: 100%"> <el-table-column label="Date" prop="date" /> <el-table-column label="Name" prop="name" /> <el-table-column align="right"> <template #header> <el-input v-model="search" size="small" placeholder="Type to search" /> </template> <template #default="scope"> <el-button size="small" @click="handleEdit(scope.$index, scope.row)" >Edit</el-button > <el-button size="small" type="danger" @click="handleDelete(scope.$index, scope.row)" >Delete</el-button > </template> </el-table-column> </el-table></el-tab-pane> </el-tabs> </template> <script lang="ts" setup> import { computed, ref } from 'vue' interface User { date: string name: string address: string } const search = ref('') const filterTableData = computed(() => tableData.filter( (data) => !search.value || data.name.toLowerCase().includes(search.value.toLowerCase()) ) ) const handleEdit = (index: number, row: User) => { console.log(index, row) } const handleDelete = (index: number, row: User) => { console.log(index, row) } const tableData: User[] = [ { date: '2016-05-03', name: 'Tom', address: 'No. 189, Grove St, Los Angeles', }, { date: '2016-05-02', name: 'John', address: 'No. 189, Grove St, Los Angeles', }, { date: '2016-05-04', name: 'Morgan', address: 'No. 189, Grove St, Los Angeles', }, { date: '2016-05-01', name: 'Jessy', address: 'No. 189, Grove St, Los Angeles', }, ] </script> <style> .demo-tabs > .el-tabs__content { padding: 32px; color: #6b778c; font-size: 32px; font-weight: 600; } </style>

以下是转换后的纯HTML+Element UI代码：

<div class="demo-tabs el-tabs">
  <div class="el-tabs__header">
    <div class="el-tabs__nav-wrap">
      <div role="tab" aria-controls="pane-first" :aria-selected="activeName==='first' ? 'true' : 'false'" class="el-tabs__item" :class="{ 'is-active': activeName==='first' }" @click="activeName='first'">User</div>
      <div role="tab" aria-controls="pane-second" :aria-selected="activeName==='second' ? 'true' : 'false'" class="el-tabs__item" :class="{ 'is-active': activeName==='second' }" @click="activeName='second'">Config</div>
      <div role="tab" aria-controls="pane-third" :aria-selected="activeName==='third' ? 'true' : 'false'" class="el-tabs__item" :class="{ 'is-active': activeName==='third' }" @click="activeName='third'">Role</div>
      <div role="tab" aria-controls="pane-fourth" :aria-selected="activeName==='fourth' ? 'true' : 'false'" class="el-tabs__item" :class="{ 'is-active': activeName==='fourth' }" @click="activeName='fourth'">Task</div>
    </div>
  </div>
  <div class="el-tabs__content">
    <div role="tabpanel" aria-hidden="false" id="pane-first" class="el-tab-pane" :class="{ 'is-active': activeName==='first' }">
      <table class="el-table" style="width: 100%">
        <thead class="el-table__header">
          <tr>
            <th class="el-table_1_column_1">Date</th>
            <th class="el-table_1_column_2">Name</th>
            <th class="el-table_1_column_3">Operation</th>
          </tr>
        </thead>
        <tbody class="el-table__body">
          <tr v-for="(item, index) in filterTableData" :key="index">
            <td>{{ item.date }}</td>
            <td>{{ item.name }}</td>
            <td class="el-table_1_column_3">
              <button class="el-button el-button--small" @click="handleEdit(index, item)">Edit</button>
              <button class="el-button el-button--small el-button--danger" @click="handleDelete(index, item)">Delete</button>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <div role="tabpanel" aria-hidden="true" id="pane-second" class="el-tab-pane" :class="{ 'is-active': activeName==='second' }">
      <table class="el-table" style="width: 100%">
        <thead class="el-table__header">
          <tr>
            <th class="el-table_2_column_1">Date</th>
            <th class="el-table_2_column_2">Name</th>
            <th class="el-table_2_column_3">Operation</th>
          </tr>
        </thead>
        <tbody class="el-table__body">
          <tr v-for="(item, index) in filterTableData" :key="index">
            <td>{{ item.date }}</td>
            <td>{{ item.name }}</td>
            <td class="el-table_2_column_3">
              <button class="el-button el-button--small" @click="handleEdit(index, item)">Edit</button>
              <button class="el-button el-button--small el-button--danger" @click="handleDelete(index, item)">Delete</button>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <div role="tabpanel" aria-hidden="true" id="pane-third" class="el-tab-pane" :class="{ 'is-active': activeName==='third' }">
      <table class="el-table" style="width: 100%">
        <thead class="el-table__header">
          <tr>
            <th class="el-table_3_column_1">Date</th>
            <th class="el-table_3_column_2">Name</th>
            <th class="el-table_3_column_3">Operation</th>
          </tr>
        </thead>
        <tbody class="el-table__body">
          <tr v-for="(item, index) in filterTableData" :key="index">
            <td>{{ item.date }}</td>
            <td>{{ item.name }}</td>
            <td class="el-table_3_column_3">
              <button class="el-button el-button--small" @click="handleEdit(index, item)">Edit</button>
              <button class="el-button el-button--small el-button--danger" @click="handleDelete(index, item)">Delete</button>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
    <div role="tabpanel" aria-hidden="true" id="pane-fourth" class="el-tab-pane" :class="{ 'is-active': activeName==='fourth' }">
      <table class="el-table" style="width: 100%">
        <thead class="el-table__header">
          <tr>
            <th class="el-table_4_column_1">Date</th>
            <th class="el-table_4_column_2">Name</th>
            <th class="el-table_4_column_3">Operation</th>
          </tr>
        </thead>
        <tbody class="el-table__body">
          <tr v-for="(item, index) in filterTableData" :key="index">
            <td>{{ item.date }}</td>
            <td>{{ item.name }}</td>
            <td class="el-table_4_column_3">
              <button class="el-button el-button--small" @click="handleEdit(index, item)">Edit</button>
              <button class="el-button el-button--small el-button--danger" @click="handleDelete(index, item)">Delete</button>
            </td>
          </tr>
        </tbody>
      </table>
    </div>
  </div>
</div>

需要注意的是，Element UI的CSS样式需要在HTML文件中引入。此外，上述代码中的`activeName`、`search`、`filterTableData`、`handleEdit`和`handleDelete`需要在JavaScript中定义和实现。

<el-table v-if="refreshTable" v-loading="loading" :data="classifyList" row-key="classifyId" :default-expand-all="isExpandAll" :tree-props="{children: 'children', hasChildren: 'hasChildren'}" > <el-table-column label="资源分类名称" prop="classifyName" /> <el-table-column label="操作" align="center" class-name="small-padding fixed-width"> <template slot-scope="scope"> <el-button size="mini" type="text" icon="el-icon-edit" @click="handleUpdate(scope.row)" v-hasPermi="['esb:classify:edit']" >修改</el-button> <el-button size="mini" type="text" icon="el-icon-plus" @click="handleAdd(scope.row)" v-hasPermi="['esb:classify:add']" >新增</el-button> <el-button size="mini" type="text" icon="el-icon-delete" @click="handleDelete(scope.row)" v-hasPermi="['esb:classify:remove']" >删除</el-button> </template> </el-table-column> </el-table>实现树形拖拽以及后台树形数据的存储

实现树形拖拽和后台树形数据的存储需要进行以下步骤：

1.在表格上添加一个拖拽事件 `@node-drag-start="handleDragStart" @node-drag-over="handleDragOver" @node-drag-enter="handleDragEnter" @node-drag-leave="handleDragLeave" @node-drag-end="handleDragEnd" @node-drop="handleDrop"`。

2.实现拖拽事件的方法，具体实现方式可以参考 Element UI 的文档。在 `handleDrop` 方法中，可以获取到拖拽的节点和目标节点，然后将拖拽的节点移动到目标节点的子节点中。

3.在后台存储树形数据时，可以使用递归的方式将树形数据转换成一个数组，然后将数组存储到数据库中。在获取树形数据时，可以将数组转换成树形数据。

下面是一个简单的代码示例，仅供参考：

<template>
  <el-table
    :data="treeData"
    :tree-props="treeProps"
    row-key="id"
    @node-drag-start="handleDragStart"
    @node-drag-over="handleDragOver"
    @node-drag-enter="handleDragEnter"
    @node-drag-leave="handleDragLeave"
    @node-drag-end="handleDragEnd"
    @node-drop="handleDrop"
  >
    <el-table-column prop="name" label="名称"></el-table-column>
  </el-table>
</template>

<script>
export default {
  data() {
    return {
      treeData: [
        {
          id: 1,
          name: "节点1",
          children: [
            {
              id: 2,
              name: "节点2",
            },
          ],
        },
        {
          id: 3,
          name: "节点3",
        },
      ],
      treeProps: {
        children: "children",
        hasChildren: (data) => data.children && data.children.length > 0,
      },
    };
  },
  methods: {
    handleDragStart(draggingNode) {
      console.log("handleDragStart", draggingNode);
    },
    handleDragOver(draggingNode, dropNode) {
      console.log("handleDragOver", draggingNode, dropNode);
    },
    handleDragEnter(draggingNode, dropNode) {
      console.log("handleDragEnter", draggingNode, dropNode);
    },
    handleDragLeave(draggingNode, dropNode) {
      console.log("handleDragLeave", draggingNode, dropNode);
    },
    handleDragEnd(draggingNode) {
      console.log("handleDragEnd", draggingNode);
    },
    handleDrop(draggingNode, dropNode, dropType) {
      console.log("handleDrop", draggingNode, dropNode, dropType);
      if (dropType === "inner") {
        draggingNode.parent.children.splice(draggingNode.parent.children.indexOf(draggingNode), 1);
        dropNode.children.push(draggingNode);
        draggingNode.parent = dropNode;
      } else {
        const index = dropNode.parent.children.indexOf(dropNode);
        draggingNode.parent.children.splice(draggingNode.parent.children.indexOf(draggingNode), 1);
        dropNode.parent.children.splice(index + (dropType === "before" ? 0 : 1), 0, draggingNode);
        draggingNode.parent = dropNode.parent;
      }
    },
  },
};
</script>