layui表單校驗及監聽複選框選中狀态的坑

今天要在送出表單前确認勾選協定，

加上

lay-verify="required"沒有用

，改成下面這樣

<input type="checkbox" lay-verify="check" name="agree" id="agree" title="确定" >      

...
        layui.use(['form','upload','layer','element'], function(){
            let form = layui.form;
            layer = layui.layer;


            form.verify({
                check:function () {
                    let checked=document.getElementById("agree");
                    if(checked.checked==false){
                        return "請勾選協定";
                    }
                }
            });
            ...