layui的一些小技巧写法如：select默认选择，时间选择插件

                        <div class="layui-form-item">
                            <label class="layui-form-label">选择广告地位</label>
                            <div class="layui-input-inline" style="width: 300px;"  >
                                <select name="adv_site" id="siteid" lay-filter="pid">
                                    <option value="n">全体</option>
                                    {loop $advsite_list  $v}
                                    <option value=""></option>
                                    <option value="{$v["site_id"]}"> {$v["site_name"]}</option>
                                    {/loop}
                                </select>
                            </div>
                        </div>                        <div class="layui-form-ite