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;
}
countDown(2023, 1, 21, 0);
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`;
}
countDown(2023, 1, 21, 0);