1.html

<label class="layui-form-label">报表年度</label>
<div class="layui-input-block">
	<input
	id="echoReportFormYear"
	type="text"
	name="reportFormYear"
	lay-verify="number|required|nlength"
	autocomplete="off"
	placeholder="请输入报表年度"
	class="layui-input"
	/>
</div>

2.js文件

layui.use(['form'], function () {
        var upload = layui.upload;
        var form = layui.form;
	//自定义校验
        form.verify({
            nlength: function (value) {
                if (value.length!=4){
                    return '年份不合法';//返回的错误信息
                }
            }
        });
	//此处即为 radio 的监听事件
        form.on('radio(levelM)', function(data){
            //console.log(data.elem); //得到radio原始DOM对象
            if (data.value == 1){
                $("#checkYearType").hide()

            }else{
                $("#checkYearType").show()
            }

        });
    });

Q.E.D.