防止Layui form表单重复提交的实现方法

form.on("submit(formConfig)",function(data){
  return false;
 }); 

   <form class="layui-form" id="addform" name="addform" lay-filter="formConfig" method="post" action="" enctype="multipart/form-data" οnsubmit="return false" > 

   <button type="submit" class="btn btn-primary radius" id="btnSave" >提交</button>

 $(function(){
  $("#btnSave").click(function(){
     layui.use('form',function(){
        var form=layui.form;
        form.render();
        form.on("submit(formConfig)",function(data){
        return false;
        });
     });

     $.ajax({

       // to do......

     });

   }）；