layer的confirm框，为什么不执行对应的函数呢？

Question

1.会弹出123
2.但是不会弹出1
3.也不会弹出2
4.确认提交confirm框会一闪而过，之后表单提交

<form method="post" action="<%=basePath%>questionnaire/save"  onsubmit="return check_form()" id="form_1">

</form>

function check_form(){

    alert（123）;

    layer.confirm('确认提交？', 

            

            {

              btn: ['确定','取消'] //按钮

    

            }, 

            

            function(index){

                alert(1);

              layer.msg('感谢您参与平台调研，稍后会有工作人员联系您！', {icon: 1});

              return true;

            },

            function(index){

                alert(2);

                layer.msg('已取消！', {icon: 1});

                return false;

            }

        );

}

Answer 1

加一句e.preventDefault(),然后在function check_form()里面加一个e也就变成<form method="post" action="<%=basePath%>questionnaire/save"&nbsp; onsubmit="return check_form()" id="form_1"></form>function check_form(e){&nbsp; &nbsp; e.preventDefault();&nbsp; &nbsp; alert（123）;&nbsp; &nbsp; layer.confirm('确认提交？',&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; btn: ['确定','取消'] //按钮&nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; function(index){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; alert(1);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; layer.msg('感谢您参与平台调研，稍后会有工作人员联系您！', {icon: 1});&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return true;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; function(index){&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; alert(2);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; layer.msg('已取消！', {icon: 1});&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; return false;&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; );}