layui表单验证select下拉框实现验证的方法

<div class="layui-form-item">
  <label class="layui-form-label">所属工种:</label>
  <div class="layui-input-block">
    <select name="work_id" lay-verify="required" lay-search>
      <option>请选择所属工种</option>
      {volist name='list' id='vo'}
      <option value="{$vo.id}">{$vo.name}</option>
      {/volist}
    </select>
  </div>
</div>