利用JavaScript實(shí)現(xiàn)春節(jié)倒計(jì)時(shí)效果(移動(dòng)端和PC端)

更新時(shí)間：2022年01月14日 10:29:10 作者：前端大歌謠

這篇文章主要介紹了通過Html+Css+js如何實(shí)現(xiàn)春節(jié)倒計(jì)時(shí)效果，本文同時(shí)介紹了移動(dòng)端和PC端兩種效果，感興趣的同學(xué)可以跟隨小編一起動(dòng)手試試

效果預(yù)覽

html部分

<!DOCTYPE html>
<!--geyao-->
  <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">
    <link rel="stylesheet" href="css/style.css" rel="external nofollow" >
    <link rel="stylesheet" href="css/mobile.css" rel="external nofollow" >
    <title>春節(jié)倒計(jì)時(shí)</title>
  </head>
  <body>
    <div class="container">
      <h2><span id="title">春節(jié)倒計(jì)時(shí)</span>2022</h2>
      <div class="countdown">
        <div id="day">--</div>
        <div id="hour">--</div>
        <div id="minute">--</div>
        <div id="second">--</div>
      </div>
      <!-- 手動(dòng)切換不好看 直接加定時(shí)器切換 微信公眾號關(guān)注前端小歌謠
       -->
      <!-- <div id="btn">切換背景</div> -->
    </div>
      <script  src="js/script.js"></script>
 
  </body>
</html>

移動(dòng)端樣式（mobile.css）

@media screen and (max-width: 1025px) {
	* {
		margin: 0;
		padding: 0;
	}
	body {
		background: rgb(129, 155, 190) url(../image/geyao1.jpg);
		background-size: cover;
		background-position: center center;
		height: 100%;
	}
	.container {
		margin: 0;
		color: #fff;
		line-height: normal;
		position: absolute;
		align-items: center;
		left: 5%;
		right: 5%;
	}
	.container h2 {
		font-size: 6em;
		text-align: center;
		margin: 10% 0;
		color: #fff;
	}
	.container h2 span {
		color: #fff;
		display: block;
		text-align: center;
		font-size: 0.3em;
		font-weight: 300;
		letter-spacing: 2px;
	}
	.countdown {
		display: flex;
		justify-content: space-around;
		margin: 0;
	}
	.countdown div {
		width: 20%;
		height: 13vw;
		margin: 0 10px;
		line-height: 13vw;
		font-size: 2em;
		position: relative;
		text-align: center;
		background: #333333;
		color: #ffffff;
		font-weight: 500;
		border-radius: 10px 10px 0 0;
	}
	.countdown div:before {
		content: '';
		position: absolute;
		bottom: -30px;
		left: 0;
		width: 100%;
		height: 30px;
		background: #b00000;
		color: #ffffff;
		font-size: 0.4em;
		line-height: 35px;
		font-weight: 300;
		border-radius: 0 0 10px 10px;
	}
	.countdown #day:before {
		content: '天';
	}
	.countdown #hour:before {
		content: '時(shí)';
	}
	.countdown #minute:before {
		content: '分';
	}
	.countdown #second:before {
		content: '秒';
	}
}

pc端樣式（style.css）

 
* {
	margin: 0;
	padding: 0;
	font-family: 'Poppins', sans-serif;
}
@media screen and (min-width: 1025px) {
	body {
		background: rgb(129, 155, 190) url(../image/geyao1.jpg);
		background-attachment: fixed;
		background-size: cover;
		-webkit-background-size: cover;
		-o-background-size: cover;
	}
	.container {
		position: absolute;
		top: 80px;
		left: 100px;
		right: 100px;
		bottom: 80px;
		background-size: cover;
		-webkit-background-size: cover;
		-o-background-size: cover;
		display: flex;
		justify-content: center;
		align-items: center;
		flex-direction: column;
		box-shadow: 0 50px 50px rgba(0, 0, 0, 0.8),
			0 0 0 100px rgba(0, 0, 0, 0.3);
	}
	.container h2 {
		text-align: center;
		font-size: 10em;
		line-height: 0.7em;
		color: #ffffff;
		margin-top: -80px;
	}
	.container h2 span {
		display: block;
		font-weight: 300;
		letter-spacing: 6px;
		font-size: 0.2em;
	}
	.countdown {
		display: flex;
		margin-top: 50px;
	}
	.countdown div {
		position: relative;
		width: 100px;
		height: 100px;
		line-height: 100px;
		text-align: center;
		background: #333;
		color: #fff;
		margin: 0 15px;
		font-size: 3em;
		font-weight: 500;
		border-radius: 10px 10px 0 0;
	}
	.countdown div:before {
		content: '';
		position: absolute;
		bottom: -30px;
		left: 0;
		width: 100%;
		height: 35px;
		background: #b00000;
		color: #ffffff;
		font-size: 0.35em;
		line-height: 35px;
		font-weight: 300;
		border-radius: 0 0 10px 10px;
	}
	.countdown #day:before {
		content: '天';
	}
	.countdown #hour:before {
		content: '時(shí)';
	}
	.countdown #minute:before {
		content: '分';
	}
	.countdown #second:before {
		content: '秒';
	}
}
canvas {
	width: 100%;
	height: 100%;
}
::-webkit-scrollbar {
	display: none;
}
#btn{
  margin: 40px;
  width: 100px;
  height: 30px;
  background: pink;
  text-align: center;
  color: darkred;
  line-height: 30px;
}

js部分

class Snowflake {
  constructor() {
    this.x = 0;
    this.y = 0;
    this.vx = 0;
    this.vy = 0;
    this.radius = 0;
    this.alpha = 0;
    this.reset();
  }
  reset() {
    this.x = this.randBetween(0, window.innerWidth);
    this.y = this.randBetween(0, -window.innerHeight);
    this.vx = this.randBetween(-3, 3);
    this.vy = this.randBetween(2, 5);
    this.radius = this.randBetween(1, 4);
    this.alpha = this.randBetween(0.1, 0.9);
  }
  randBetween(min, max) {
    return min + Math.random() * (max - min);
  }
  update() {
    this.x += this.vx;
    this.y += this.vy;
    if (this.y + this.radius > window.innerHeight) {
      this.reset();
    }
  }
}
class Snow {
  constructor() {
    this.canvas = document.createElement('canvas');
    this.ctx = this.canvas.getContext('2d');
    document.body.appendChild(this.canvas);
    window.addEventListener('resize', () => this.onResize());
    this.onResize();
    this.updateBound = this.update.bind(this);
    requestAnimationFrame(this.updateBound);
    this.createSnowflakes();
  }
  onResize() {
    this.width = window.innerWidth;
    this.height = window.innerHeight;
    this.canvas.width = this.width;
    this.canvas.height = this.height;
  }
  createSnowflakes() {
    const flakes = window.innerWidth / 4;
    this.snowflakes = [];
    for (let s = 0; s < flakes; s++) {
      this.snowflakes.push(new Snowflake());
    }
  }
  update() {
    this.ctx.clearRect(0, 0, this.width, this.height);
    for (let flake of this.snowflakes) {
      flake.update();
      this.ctx.save();
      this.ctx.fillStyle = '#FFF';
      this.ctx.beginPath();
      this.ctx.arc(flake.x, flake.y, flake.radius, 0, Math.PI * 2);
      this.ctx.closePath();
      this.ctx.globalAlpha = flake.alpha;
      this.ctx.fill();
      this.ctx.restore();
    }
    requestAnimationFrame(this.updateBound);
  }
}
new Snow();
var stop = false;
function show_runtime() {
  var newDay = '2022/2/1 00:00:00';
  var countDate = new Date(newDay);
  var now = new Date().getTime();
  gap = countDate - now;
  var second = 1000;
  var minute = second * 60;
  var hour = minute * 60;
  var day = hour * 24;
  var d = Math.floor(gap / day);
  var h = Math.floor((gap % day) / hour);
  var m = Math.floor((gap % hour) / minute);
  var s = Math.floor((gap % minute) / second);
  if ((d, h, m, s < 0)) {
    stop = true;
  } else {
    document.getElementById('day').innerText = d;
    document.getElementById('hour').innerText = h;
    document.getElementById('minute').innerText = m;
    document.getElementById('second').innerText = s;
  }
}
function newyear() {
  document.getElementById('title').innerText = 'Happy Spring Festival';
  document.getElementById('day').innerText = '春';
  document.getElementById('hour').innerText = '節(jié)';
  document.getElementById('minute').innerText = '快';
  document.getElementById('second').innerText = '樂';
}
var time = setInterval(() => {
  show_runtime();
  if (stop === true) {
    newyear();
    clearInterval(time);
  }
}, 1000);
// 定時(shí)器 控制圖片自動(dòng)切換
function downTime() {
  let item = 1;
  setInterval(() => {
    item++;
    if (item === 4) {
      item = 1;
    }
    console.log(item, 'item');
    document.body.style.backgroundImage = `url(./image/geyao${item}.jpg)`;
    return item;
    e.stopPropagation(); //取消事件冒泡
  }, 2000);
}
window.onload = downTime;