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本文實(shí)例為大家分享了JavaScript實(shí)現(xiàn)前端倒計(jì)時(shí)效果的具體代碼，供大家參考，具體內(nèi)容如下

JavaScript實(shí)現(xiàn)前端倒計(jì)時(shí)效果

代碼：

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									<!DOCTYPE html>

									<html lang="en">

									<head>

									  <meta charset="UTF-8">

									  <title>Title</title>

									  <style>

									    div {

									      padding: 10px;

									      font-size: 100px;

									    }

									    p {

									      float: left;

									      width: 300px;

									      height: 300px;

									      border: 1px solid #000000;

									      color: #ffffff;

									      background-color: #333333;

									      text-align: center;

									      line-height: 300px;

									    }

									  </style>

									</head>

									<body>

									  <div>

									    <p class="hour">1</p>

									    <p class="minute">2</p>

									    <p class="second">3</p>

									  </div>

									  <script>

									    window.addEventListener('load', function() {

									      //獲取元素

									      var hour = document.querySelector('.hour'); //小時(shí)的黑盒子

									      var minute = document.querySelector('.minute'); //分鐘的黑色盒子

									      var second = document.querySelector('.second'); //秒數(shù)的黑色盒子

									      var inputTime = +new Date('2021-2-6 18:00:00'); //返回的是用戶輸入時(shí)間總的毫秒數(shù)

									      countDown(); //先調(diào)用一次這個(gè)函數(shù)，防止第一次刷新頁(yè)面有空白

									      //開(kāi)啟定時(shí)器

									      setInterval(countDown, 1000);

									      function countDown() {

									        var nowTime = +new Date(); //返回的是當(dāng)前時(shí)間總的毫秒數(shù)

									        var times = (inputTime - nowTime) / 1000; //tiems是剩余時(shí)間總的毫秒數(shù)

									        var h = parseInt(times / 60 / 60 % 24); //時(shí)

									        h = h < 10 ? '0' + h : h;

									        hour.innerHTML = h; //把剩余的小時(shí)給小時(shí)黑盒子

									        var m = parseInt(times / 60 % 60); //分

									        m = m < 10 ? '0' + m : m;

									        minute.innerHTML = m;

									        var s = parseInt(times % 60); //當(dāng)前的秒

									        s = s < 10 ? '0' + s : s;

									        second.innerHTML = s;

									      }

									    })

									</script>