创建一个v-myfocus指令，实现input框自动聚焦
<body>
<div id="app">
<div class="add">
编号:<input type="text" v-model="newId" v-myfocus="newId">
品牌名称:<input type="text" v-model="newName" @keyDown.enter="addData">
<input type="button" value="添加" @click="addData">
</div>
<div class="add">
品牌名称:<input type="text" placeholder="请输入搜索条件">
</div>
<div>
<table class="tb">
<tr>
<th v-mycolor="color">编号</th>
<th>品牌名称</th>
<th>创立时间</th>
<th>操作</th>
</tr>
<tr v-for="(item,index) in list" :key="index">
<td>{{item.id}}</td>
<td>{{item.name}}</td>
<td>{{item.ctime}}</td>
<td>
<button @click="delData(index)" v-mycolor="color">删除</button>
</td>
</tr>
<!-- <tr>
<td colspan="4">没有品牌数据</td>
</tr> -->
<!-- 动态生成内容tr -->
</table>
</div>
</div>
</body><body>
<div id=
