需先引入：
formSelects-v4.css
formSelects-v4.js
插件下载地址：https://fly.layui.com/extend/formSelects
使用：
<div class="layui-form">
<div class="layui-input-inline">
<select name="select_base_cityname" id="select_base_cityname" lay-filter="select_base_cityname" xm-select="select_base_cityname" xm-select-type="1">
<option value=""></option>
<option value="1">北京</option>
<option value="2">上海</option>
<option value="3">天津</option>
<option value="4">重庆</option>
</select>
</div>
</div>
layui.use(['form', 'layer', 'jquery', 'table', 'laydate', 'element', 'upload', 'flow'], function () {
var $$ = layui.jquery;
var form = layui.form,
layer = parent.layer == undefined ? layui.layer : parent.layer,
//layer = layui.layer,
table = layui.table,
laydate = layui.laydate,
element = layui.element,
upload = layui.upload,
flow = layui.flow;
form.render();
formSelects.on('select_base_cityname', function (id,vals,val,isAdd,isDisabled) {
var getName = layui.formSelects.value('select_base_cityname');//取值
layer.msg("你选择的值为：" + getName);
});
});