<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script> window.onload=function(){ function showTime(){ var div = document.querySelectorAll('div'); var nowT = +new Date(); var endT = new Date('2019-10-19 12:00:00'); var startT = (endT - nowT) / 1000; //开始时间 秒 var d = parseInt(startT / 60 / 60 / 24); d = d<10?"0"+d:d; div[0].innerHTML=d; var h = parseInt(startT / 60 / 60 %24 ); h = h < 10 ? "0" + h : h; div[1].innerHTML=h; var m = parseInt(startT / 60 % 60); m = m < 10 ? "0" + m : m; div[2].innerHTML=m; var s = parseInt(startT % 60 ); s = s < 10 ? "0" + s : s; div[3].innerHTML=s; } setInterval(showTime); } </script> <style> div{ width: 50px; height: 60px; background: black; display: inline-block; line-height: 60px; font-size: 28px; color: cornsilk; text-align: center; } </style> </head> <body> <div id='d'></div> <div id="h"></div> <div id="m"></div> <div id='s'></div> </body> </html>