真是奇怪，js可以，jq却开启了多个定时器，谁能解答一下

        timer = setInterval(mar,30);        //鼠标移上去清除时钟        box.onmouseover = function(event){            clearInterval(timer);            event.stopPropagation();            //这里是阻止冒泡，不加要冒泡到body上面，鼠标在body上面就会clearInterval(timer);            box.onmouseout = function(event){                timer = setInterval(mar, 30);             event.stopPropagation();            }        };        //用jq方式写        /*$(box).on(‘mouseover‘,function(){            clearInterval(timer);        })*///        $(box).mouseover(function(event){//            clearInterval(timer);//            event.stopPropagation();//            $(box).mouseout(function(e){//                timer = setInterval(mar,30);//                e.stopPropagation();//            })//        });