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>