js
const endTimeObj = new Date("2020-5-1"); function countTime() { //时间差 var leftTime = endTimeObj - new Date(); //定义变量 d,h,m,s保存倒计时的时间 var d, h, m, s; if (leftTime < 0) { return; } d = Math.floor(leftTime / 1000 / 60 / 60 / 24); h = Math.floor((leftTime / 1000 / 60 / 60) % 24); m = Math.floor((leftTime / 1000 / 60) % 60); s = Math.floor((leftTime / 1000) % 60); const str = `${d}天${h}时${m}分${s}秒`; setTimeout(countTime, 1000); console.log(str); //将倒计时赋值到div中 //递归每秒调用countTime方法，显示动态时间效果 } countTime();
html
<!DOCTYPE html> <html lang="en"> <head> <title>倒计时</title> </head> <body> <script type="text/javascript"> const endTimeObj = new Date("2020-5-1"); function countTime() { //时间差 var leftTime = endTimeObj - new Date(); //定义变量 d,h,m,s保存倒计时的时间 var d, h, m, s; if (leftTime < 0) { return; } d = Math.floor(leftTime / 1000 / 60 / 60 / 24); h = Math.floor((leftTime / 1000 / 60 / 60) % 24); m = Math.floor((leftTime / 1000 / 60) % 60); s = Math.floor((leftTime / 1000) % 60); const str = `${d}天${h}时${m}分${s}秒`; setTimeout(countTime, 1000); console.log(str); //将倒计时赋值到div中 //递归每秒调用countTime方法，显示动态时间效果 } countTime(); </script> </body> </html>