//执行setTimeOut函数返回的ID    var timeOutCount;    //周期(以毫秒/ms为单位)，平均每3秒刷新一次    var timeCycle = 3000;    $(function () {        getData();    });    //向服务器发送请求，并获取返回结果    function getData() {        $.ajax({            type: ‘GET‘,            url: ‘...‘,            dataType: "json",            global: false,            success: function (data) {                /*TO DO*/                timeOutCount = setTimeout(getData, timeCycle);            },            error: function (data) {                timeOutCount = setTimeout(getData, timeCycle);            }        });    }    //停止    function stop() {        if (timeOutCount > 0) {            removeTimeOut(timeOutCount);        }    }    //清空TimeOut    function removeTimeOut(id) {        window.clearTimeout(id);    }