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<>js实现天数倒计时
在用js实现倒计时的时候，可以先算出截止日期和今天之间相差的毫秒数，然后进行相应的比例进行day、 month
、hour、minute、second的计算，便可以准确的计算出相差的时间。
倒计时格式为：纯天数倒计时
function CountDown(year, month, day, hours) { let now = new Date(); let
endDate = new Date(year, month - 1, day, hours); let leftTime =
endDate.getTime() - now.getTime();//计算剩余的毫秒数 if (leftTime <= 0) { leftTime = 0;
} let leftsecond = parseInt(leftTime / 1000);//计算剩余的秒数 let countDay =
Math.floor(leftsecond / (60 * 60 * 24)); return countDay; }, //直接调用就好了
CountDown(2050, 12, 31, 24)
倒计时格式为：天数+小时+分钟+秒
function CountDown(year, month, day, hours) { let now = new Date(); let
endDate = new Date(year, month - 1, day, hours); let leftTime =
endDate.getTime() - now.getTime();//计算剩余的毫秒数 if (leftTime <= 0) { leftTime = 0;
} let leftsecond = parseInt(leftTime / 1000);//计算剩余的秒数 day =
Math.floor(leftsecond / (60 * 60 * 24)); let hour = Math.floor((leftsecond -
day * 24 * 60 * 60) / 3600); let minute = Math.floor((leftsecond - day * 24 *
60 * 60 - hour * 3600) / 60); let second = Math.floor(leftTime / 1000 % 60,
10); return `${day}天${hour}小时${minute}分钟${second}秒`; } //直接调用即可 CountDown(2050,
12, 31, 24)
