js中的时间与毫秒数互相转换,倒计时

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1、日期格式转换成毫秒数

var oldTime = (new Date("2017-03-22 11:11:11")).getTime(); //得到毫秒数

也可以支持 "2017/03/22 11:11:11"

2、毫秒转化成时间

var date = new Date(oldTime); //得到普通格式的时间

3、倒计时

<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>倒计时</title></head><body><div id="ytime"></div><script type="text/javascript" src="http://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script><script type="text/javascript">$(document).ready(function(){var enddate = '2018/03/22 9:35:30';    run(enddate,'ytime');//参数：截止时间，节点id});//定时器var timer;function run(enddate,id){    //如果enddate为后台传入的Date类型，这里直接转化为毫秒数    enddate = (new Date(enddate.replace("T"," "))).getTime();    //以500毫秒的速度执行（可以避免方法执行速度慢会影响展示效果的情况）0    var time = 500;     timer = setInterval("dateDif('"+enddate+"','"+id+"')",time);}//计算时间相差function dateDif(enddate,id){    var date = enddate - new Date().getTime();    console.log(11);    if(date <= 0){    $('#'+id).text('已超时');    clearInterval(timer);    return;    }    var days    = date / 1000 / 60 / 60 / 24;    var daysRound   = Math.floor(days);    var hours    = date/ 1000 / 60 / 60 - (24 * daysRound);    var hoursRound   = Math.floor(hours);    var minutes   = date / 1000 /60 - (24 * 60 * daysRound) - (60 * hoursRound);    var minutesRound  = Math.floor(minutes);    var seconds   = date/ 1000 - (24 * 60 * 60 * daysRound) - (60 * 60 * hoursRound) - (60 * minutesRound);    var secondsRound  = Math.floor(seconds);    var time = "倒计时"+(daysRound+"天"+hoursRound +"时"+minutesRound+"分"+secondsRound+"秒");    $('#'+id).text(time);} </script></body></html>

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