SOURCE

layui.use('table', function () {
    let table = layui.table, form = layui.form;


    form.on('select(select_filter)', function(data){
        console.log(data.elem); //得到select原始DOM对象
        console.log(data.value); //得到被选中的值
        console.log(data.othis); //得到美化后的DOM对象
    });      
      
});

<div class="layui-form">
   <h1>请尝试在展开下拉框后 按 ALT 键</h1>
    <div class="layui-form-item">
        <label class="layui-form-label">单行选择框</label>
        <div class="layui-input-block">
            <select name="interest" lay-filter="select_filter" lay-search>
                <option value=""></option>
                <option value="0">写作</option>
                <option value="1" selected="">阅读</option>
                <option value="2">游戏</option>
                <option value="3">音乐</option>
                <option value="4">旅行</option>
            </select>
        </div>
    </div>
</div>