<form method="get">
  <div class="field has-addons">
    <div class="control">
      <input type="search" name="search" autofocus class="input" placeholder="请输入搜索关键字" value="{{search}}" />
    </div>
    <div class="control">
      <input type="submit" value="搜 索" class="button" />
    </div>
  </div>
</form>
