layer彈框倒計時結束后執行

       var i = 10;
        var interval;
        layer.confirm('會議已結束',{
          btn: ['取消'],//按鈕
          skin: 'layui-layer-molv',success: function(a,b){  
            var fn = function() {         
             layer.title(i+' 秒后，系統將自動退出並關閉。',b);      
              i--;
            };
            interval = setInterval(function(){
                fn();
                if(i === 0){// 倒計時結束后執行             
                  layer.title('',b);
                  clearInterval(interval);
                  layer.msg('倒計時結束',{icon: 1});
                }
              },1000);
          },end:function(){
            clearInterval(interval);
          }
          },function(){
            clearInterval(interval);
            layer.msg('已取消',{icon: 1});
          });