vue全局指令-获取焦点

<div id="app">
   <div class="panel panel-primary">
      <div class="panel-body form-inline">
         <label>搜索关键字: <input type="text" class="form-control" v-focus /></label>
      </div>
   </div>
</div>
<div id="app">
   <div class="panel panel-p