js 倒计时

//倒计时，分为时间格式和数字格式倒计时。带有具体格式
/*使用示例
$("#countDown").on("click",function(){
    MY.countDown.getTime({
        seconds:5,//倒计时数字
        flag:"#countDown",//页面标识
        type:"num",//倒计时类型
        action:function(){//倒计时为0时可以执行的方法
            $("#countDown").html("执行完毕");
        }
    });
});
*/
/*
 *para
 * 倒计时的秒数：obj.seconds
 * 返回数据类型：obj.type  (time:时间类型，num：数字类型)
 * 插入文档中的位置：obj.flag
 * */
;(function(){
    var __countDown = {
        getTime:function(obj){
            var lt = [],day1,hour,minute,second;
            var seconds = parseInt(obj.seconds);
            var flag = obj.flag;
            var type = obj.type;
            if(type === "num"){//以数字形式展现出来的倒计时。
                if(!$(flag).data("go") && $(flag).data("go") != "go"){
                    $(flag).data("go","go");
                }else{
                    console.log("含有‘data-go‘属性，倒计时已经在执行");
                    return false;
                }
                $(flag).text(__countDown.formatTimeNum(seconds));
                var countsId = setInterval(function(){
                    seconds--;
                    seconds = __countDown.formatTimeNum(seconds);
                    if(seconds == "00"){
                        if(obj && obj.action){
                            obj.action();
                        }else{
                            $(flag).text("00");
                        }
                        $(flag).removeAttr("data-go");
                        clearInterval(countsId);
                    }else{
                        $(flag).text(seconds);
                    }
                },1000);
            }else{//以时间形式展现的倒计时
                if(!$(flag).data("go") && $(flag).data("go") != "go"){
                    $(flag).data("go","go");
                }else{
                    console.log("含有‘data-go=go‘属性，倒计时已经在执行");
                    return false;
                }
                var leftTime = __countDown.leftTimeToArr(seconds);
                $(flag).html("<span>" + leftTime["day"] + "天&nbsp;</span>"+"<span>" + leftTime["hour"] + "：</span><span>" + leftTime["minute"] +"：</span><span>" + leftTime["second"] + "</span>");
                var intervalId =  setInterval(function(){
                    seconds = seconds - 1;
                    if(seconds === 0){
                        if(obj && obj.action){
                            obj.action();
                        }else{
                            $(flag).html("<span>0天</span><span>00：</span><span>00：</span><span>00</span>");
                        }
                        $(flag).removeAttr("data-go");
                        clearInterval(intervalId);
                    }else{
                        var leftTime = __countDown.leftTimeToArr(seconds);
                        $(flag).html("<span>" + leftTime["day"] + "天&nbsp;</span>"+"<span>" + leftTime["hour"] + "：</span><span>" + leftTime["minute"] +"：</span><span>" + leftTime["second"] + "</span>");
                    }

                },1000);
            }
        },
        leftTimeToArr:function(seconds){
            var lt = [],day1,hour,minute,second;            day1=Math.floor(seconds/(60*60*24));            lt["day"] = day1;            hour=Math.floor((seconds-day1*24*60*60)/3600);            hour = __countDown.formatTimeNum(hour);            lt["hour"] = hour;            minute=Math.floor((seconds-day1*24*60*60-hour*3600)/60);            minute = __countDown.formatTimeNum(minute);            lt["minute"] = minute;            second=Math.floor(seconds-day1*24*60*60-hour*3600-minute*60);            second = __countDown.formatTimeNum(second);            lt["second"] = second;            return lt;        },        formatTimeNum:function(num){            if(parseInt(num) < 10){                num = "0" + num;            }            return num        }    };    TC.countDown = __countDown ||{};})();

js 倒计时

原文：http://www.cnblogs.com/baoliwei/p/4607366.html