1、html代码如下,不要忘记 lay-filter属性

 

<div class="layui-input-block">
         <select id="tid" lay-filter="tid">
             <option value="0">--请选择--</option>
             <option value="01">01</option>
             <option value="02">02</option>
         </select>
     </div>

2、javascirpt代码如下

layui.use(['form'], function () {
             form = layui.form;
             form.on('select(tid)', function (data) {
                   var val=data.value;
                   console.info(val);
             });
         });