layui表单验证

 <input type="text" id="subject_add" name="subject_add" lay-verify="subject_add"  class="layui-input">

lay-verify="subject_add"

<script>layui.use(['form', 'layer'],
 function() {
 $ = layui.jquery;
 var form = layui.form,
 layer = layui.layer;

 //自定义验证规则
 form.verify({
 subject_add: function(value) {
 if (value.length < 5) {
 return '科目名至少得2个字符';
 }
 },
 });

 //监听提交
 form.on('submit(add)',
 function(data) {
 console.log(data);
 //发异步，把数据提交给php
 layer.alert("增加成功", {
 icon: 6
 },
 function() {
 // 获得frame索引
 var index = parent.layer.getFrameIndex(window.name);
 //关闭当前frame
 parent.layer.close(index);
 });
 return false;
 });

 });</script>