定时器关闭失败，点击取消后定时器的时间越来越短,下面是代码

 var timer = window.setInterval("getNewOrders()", 15000); 
         function getNewOrders()
         { 
            var cTime = $("#cTime").text();
            $.ajax({
                type:'get',
                url:'ajaxAdmin.php?request=getNewOrders&+cTime='+cTime,
                dataType:'json',
                success:function(data){
                    $("#cTime").text(data.time);    
                    if(data.status == 1){
                        window.clearInterval(timer); 
                        var  errorHtml=$('#errorMp3').text();
                        var html_='<audio src="../msg.wav" autoplay="autoplay" style="height:0; width:0;" controls="controls" />';
                        $("#addDiv").append("<div id='target4' style='overflow-x: hidden; overflow-y: auto; width:660px;'></div>");
                            $("#target4").html(data.info);
                            $.ligerDialog.open({ 
                                target: $("#target4"),
                                width: 700,
                                height: 300,
                                title:"",
                                buttons: [
                                    { 
                                        text: '取消', onclick: function (item, dialog) { 
                                             var timer = window.setInterval("getNewOrders()",15000);  
                                             dialog.close();
                                        } 
                                    }
                                ]
                        });             
                    }
                },
            }); 
         }