*2022年圣诞节到来啦，很高兴这次我们又能一起度过~

📂文章目录

前言

时光荏苒，白驹过隙。 2022这一年又在忙碌中度过了，过去的一年，我们同努力，我们共欢笑，每一次成功都蕴藏着我们辛勤的劳动。新的一年即将来到，我们不能停滞不前，一味只是骄傲。愿大家与时俱进，拼搏不懈，共创新的辉煌！借着新年到来的喜庆，给大家分享一个新年烟花的前端代码，快拿着代码展示给你的朋友们看吧！！转眼间已经到了2022的尾巴，这一年对于国家来说丰富充实,冬奥会在北京举行、中国共产党第二十次全国代表大会召开、社会共同抗击疫情的第三年、我国完成天宫空间站建造……对于我们每一个个体，2022也承载着我们的快乐与悲伤，它是无法替代的。新的一年马上就要到了，让我们告别2022，迎接2023！希望2023,全糖去冰。

效果展示

一、夜景烟花绽放动画效果

HTML源码

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=gb2312">
    <style>
        body{margin:0;padding:0;overflow: hidden;}
        .city{width:100%;position:fixed;bottom: 0px;z-index: 100;}
        .city img{width: 100%;}
    </style>
    <title>html5夜景放烟花绽放动画效果</title>
</head>
<body onselectstart = "return false">
<div style="height:700px;overflow:hidden;">
    <canvas id='cas' style="background-color:rgba(0,5,24,1);">浏览器不支持canvas</canvas>
    <div class="city"><img src="img/city.png" alt="" /></div>
    <img src="img/moon.png" alt="" id="moon" style="visibility: hidden;"/>
    <div style="display:none">
        <div class="shape">新年快乐</div>
        <div class="shape">合家幸福</div>
        <div class="shape">万事如意</div>
        <div class="shape">心想事成</div>
        <div class="shape">财源广进</div>
    </div>
    
</div>
    
    <script>
        var canvas = document.getElementById("cas");
        var ocas = document.createElement("canvas");
        var octx = ocas.getContext("2d");
        var ctx = canvas.getContext("2d");
        ocas.width = canvas.width = window.innerWidth;
        ocas.height = canvas.height = 700;
        var bigbooms = [];
    
        window.onload = function(){
            initAnimate()
        }
        function initAnimate(){
            drawBg();
            lastTime = new Date();
            animate();
        }
        var lastTime;
        function animate(){
            ctx.save();
            ctx.fillStyle = "rgba(0,5,24,0.1)";
            ctx.fillRect(0,0,canvas.width,canvas.height);
            ctx.restore();
            var newTime = new Date();
            if(newTime-lastTime>500+(window.innerHeight-767)/2){
                var random = Math.random()*100>2?true:false;
                var x = getRandom(canvas.width/5 , canvas.width*4/5);
                var y = getRandom(50 , 200);
                if(random){
                    var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , {x:x , y:y});
                    bigbooms.push(bigboom)
                }
                else {
                    var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , {x:canvas.width/2 , y:200} , document.querySelectorAll(".shape")[parseInt(getRandom(0, document.querySelectorAll(".shape").length))]);
                    bigbooms.push(bigboom)
                }
                lastTime = newTime;
                console.log(bigbooms)
            }
            stars.foreach(function(){
                this.paint();
            })
            drawMoon();
            bigbooms.foreach(function(index){
                var that = this;
                if(!this.dead){
                    this._move();
                    this._drawLight();
                }
                else{
                    this.booms.foreach(function(index){
                        if(!this.dead) {
                            this.moveTo(index);
                        }
                        else if(index === that.booms.length-1){
                            bigbooms[bigbooms.indexOf(that)] = null;
                        }
                    })
                }
            });
            
            raf(animate);
        }
        function drawMoon(){
            var moon = document.getElementById("moon");
            var centerX = canvas.width-200 , centerY = 100 , width = 80;
            if(moon.complete){
                ctx.drawImage(moon , centerX , centerY , width , width )
            }
            else {
                moon.onload = function(){
                    ctx.drawImage(moon ,centerX , centerY , width , width)
                }
            }
            var index = 0;
            for(var i=0;i<10;i++){
                ctx.save();
                ctx.beginPath();
                ctx.arc(centerX+width/2 , centerY+width/2 , width/2+index , 0 , 2*Math.PI);
                ctx.fillStyle="rgba(240,219,120,0.005)";
                index+=2;
                ctx.fill();
                ctx.restore();
            }
            
        }
        Array.prototype.foreach = function(callback){
            for(var i=0;i<this.length;i++){
                if(this[i]!==null) callback.apply(this[i] , [i])
            }
        }
        var raf = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (callback) { window.setTimeout(callback, 1000 / 60); };
         
        canvas.onclick = function(){
            var x = event.clientX;
            var y = event.clientY;
            var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , {x:x , y:y});
            bigbooms.push(bigboom)
        }
        // canvas.addEventLisener("touchstart" , function(event){
        //     var touch = event.targetTouches[0];
        //     var x = event.pageX;
        //     var y = event.pageY;
        //     var bigboom = new Boom(getRandom(canvas.width/3,canvas.width*2/3) ,2,"#FFF" , {x:x , y:y});
        //     bigbooms.push(bigboom)
        // })
        var Boom = function(x,r,c,boomArea,shape){
            this.booms = [];
            this.x = x;
            this.y = (canvas.height+r);
            this.r = r;
            this.c = c;
            this.shape = shape || false;
            this.boomArea = boomArea;
            this.theta = 0;
            this.dead = false;
            this.ba = parseInt(getRandom(80 , 200));
        }
        Boom.prototype = {
            _paint:function(){
                ctx.save();
                ctx.beginPath();
                ctx.arc(this.x,this.y,this.r,0,2*Math.PI);
                ctx.fillStyle = this.c;
                ctx.fill();
                ctx.restore();
            },
            _move:function(){
                var dx = this.boomArea.x - this.x , dy = this.boomArea.y - this.y;
                this.x = this.x+dx*0.01;
                this.y = this.y+dy*0.01;
                if(Math.abs(dx)<=this.ba && Math.abs(dy)<=this.ba){
                    if(this.shape){
                        this._shapBoom();
                    }
                    else this._boom();
                    this.dead = true;
                }
                else {
                    this._paint();
                }
            },
            _drawLight:function(){
                ctx.save();
                ctx.fillStyle = "rgba(255,228,150,0.3)";
                ctx.beginPath();
                ctx.arc(this.x , this.y , this.r+3*Math.random()+1 , 0 , 2*Math.PI);
                ctx.fill();
                ctx.restore();
            },
            _boom:function(){
                var fragNum = getRandom(30 , 200);
                var style = getRandom(0,10)>=5? 1 : 2;
                var color;
                if(style===1){
                    color = {
                        a:parseInt(getRandom(128,255)),
                        b:parseInt(getRandom(128,255)),
                        c:parseInt(getRandom(128,255))
                    }
                }
                var fanwei = parseInt(getRandom(300, 400));
                for(var i=0;i<fragNum;i++){
                    if(style===2){
                        color = {
                            a:parseInt(getRandom(128,255)),
                            b:parseInt(getRandom(128,255)),
                            c:parseInt(getRandom(128,255))
                        }
                    }
                    var a = getRandom(-Math.PI, Math.PI);
                    var x = getRandom(0, fanwei) * Math.cos(a) + this.x;
                    var y = getRandom(0, fanwei) * Math.sin(a) + this.y; 
                    var radius = getRandom(0 , 2)
                    var frag = new Frag(this.x , this.y , radius , color , x , y );
                    this.booms.push(frag);
                }
            },
            _shapBoom:function(){
                var that = this;
                putValue(ocas , octx , this.shape , 5, function(dots){
                    var dx = canvas.width/2-that.x;
                    var dy = canvas.height/2-that.y;
                    for(var i=0;i<dots.length;i++){
                        color = {a:dots[i].a,b:dots[i].b,c:dots[i].c}
                        var x = dots[i].x;
                        var y = dots[i].y;
                        var radius = 1;
                        var frag = new Frag(that.x , that.y , radius , color , x-dx , y-dy);
                        that.booms.push(frag);
                    }
                })
            }
        }
        function putValue(canvas , context , ele , dr , callback){
            context.clearRect(0,0,canvas.width,canvas.height);
            var img = new Image();
            if(ele.innerHTML.indexOf("img")>=0){
                img.src = ele.getElementsByTagName("img")[0].src;
                imgload(img , function(){
                    context.drawImage(img , canvas.width/2 - img.width/2 , canvas.height/2 - img.width/2);
                    dots = getimgData(canvas , context , dr);
                    callback(dots);
                })
            }
            else {
                var text = ele.innerHTML;
                context.save();
                var fontSize =200;
                context.font = fontSize+"px 宋体 bold";
                context.textAlign = "center";
                context.textBaseline = "middle";
                context.fillStyle = "rgba("+parseInt(getRandom(128,255))+","+parseInt(getRandom(128,255))+","+parseInt(getRandom(128,255))+" , 1)";
                context.fillText(text , canvas.width/2 , canvas.height/2);
                context.restore();
                dots = getimgData(canvas , context , dr);
                callback(dots);
            }
        }
        function imgload(img , callback){
            if(img.complete){
                callback.call(img);
            }
            else {
                img.onload = function(){
                    callback.call(this);
                }
            }
        }
        function getimgData(canvas , context , dr){
            var imgData = context.getImageData(0,0,canvas.width , canvas.height);
            context.clearRect(0,0,canvas.width , canvas.height);
            var dots = [];
            for(var x=0;x<imgData.width;x+=dr){
                for(var y=0;y<imgData.height;y+=dr){
                    var i = (y*imgData.width + x)*4;
                    if(imgData.data[i+3] > 128){
                        var dot = {x:x , y:y , a:imgData.data[i] , b:imgData.data[i+1] , c:imgData.data[i+2]};
                        dots.push(dot);
                    }
                }
            }
            return dots;
        }
        function getRandom(a , b){
            return Math.random()*(b-a)+a;
        }
        var maxRadius = 1 , stars=[];
        function drawBg(){
            for(var i=0;i<100;i++){
                var r = Math.random()*maxRadius;
                var x = Math.random()*canvas.width;
                var y = Math.random()*2*canvas.height - canvas.height;
                var star = new Star(x , y , r);
                stars.push(star);
                star.paint()
            }
        }
        var Star = function(x,y,r){
            this.x = x;this.y=y;this.r=r;
        }
        Star.prototype = {
            paint:function(){
                ctx.save();
                ctx.beginPath();
                ctx.arc(this.x , this.y , this.r , 0 , 2*Math.PI);
                ctx.fillStyle = "rgba(255,255,255,"+this.r+")";
                ctx.fill();
                ctx.restore();
            }
        }
        var focallength = 250;
        var Frag = function(centerX , centerY , radius , color ,tx , ty){
            this.tx = tx;
            this.ty = ty;
            this.x = centerX;
            this.y = centerY;
            this.dead = false;
            this.centerX = centerX;
            this.centerY = centerY;
            this.radius = radius;
            this.color = color;
        }
        Frag.prototype = {
            paint:function(){
                ctx.save();
                ctx.beginPath();
                ctx.arc(this.x , this.y , this.radius , 0 , 2*Math.PI);
                ctx.fillStyle = "rgba("+this.color.a+","+this.color.b+","+this.color.c+",1)";
                ctx.fill()
                ctx.restore();
            },
            moveTo:function(index){
                this.ty = this.ty+0.3;
                var dx = this.tx - this.x , dy = this.ty - this.y;
                this.x = Math.abs(dx)<0.1 ? this.tx : (this.x+dx*0.1);
                this.y = Math.abs(dy)<0.1 ? this.ty : (this.y+dy*0.1);
                if(dx===0 && Math.abs(dy)<=80){
                    this.dead = true;
                }
                this.paint();
            }
        }
    </script>
</body>
</html>

再新建文件夹img把以下两张图片放进去

city.png
moon.png

2023年(新年)春节倒计时代码

2023年新年倒计时HTML源代码，2023年春节倒计时代码，直接运行index.html即可。

在这里插入图片描述

源码

NewYear.css

/*初始化*/
* {
  padding: 0;
  margin: 0 auto;
}
/*背景色*/
body,
html {
  background: url(./img/newyear.png) no-repeat;
  background-size: 100% 100%;
  background-attachment: fixed;
  /* background-color: black; */
}
/*父盒子*/
.fa {
  color:#6c5ce7;
  margin-top: 200px;
  background-color: rgba(0, 17, 17, 0.5);
  /*边框圆角*/
  border-radius: 80px;
  /*伸缩布局*/
  display: flex;
  /*改变主轴方向  竖排*/
  flex-direction: column;
}
.fir {
  margin-left: 620px;
  margin-bottom: 100px;
  font-size: 80px;
}
.fa .sj {
  /*伸缩布局*/
  display: flex;
  /*改变主轴方向*/
  flex-direction: column;
}
.fa .sj div {
  width: 100%;
  /*伸缩布局*/
  display: flex;
  /*主轴排列方式*/
  justify-content: center;
  color: black;
  margin-bottom: 60px;
  /*多行侧轴排列方式*/
  align-content: space-around;
  color:#ff7675;
  font-size: 55px;
}
.fa .sj .zi {
  color:#d63031;
}

index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>新年倒计时</title>
    <link rel="stylesheet" href="NewYear.css">
    <script src="NewYear.js"></script>
</head>
<body>
    <div class="fa">
        <span class="fir">距离2023春节(1-22)还有</span>
        <div class="sj">
            <div><span></span><span class="zi">天</span></div>
            <div><span></span><span class="zi">时</span></div>
            <div><span></span><span class="zi">分</span></div>
            <div><span></span><span class="zi">秒</span></div>
        </div>
    </div>
</body>
</html>

2023除夕倒计时

效果展示

在这里插入图片描述

源码

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>新年快乐</title>
<style>
body{
  overflow: hidden;
  margin: 0;
}
h1{
  position: fixed;
  top: 30%;
  left: 0;
  width: 100%;
  text-align: center;
  transform:translateY(-50%);
  font-family: 'Love Ya Like A Sister', cursive;
  font-size: 60px;
  color: #c70012;
  padding: 0 20px;
}
h1 span{
  position: fixed;
  left: 0;
  width: 100%;
  text-align: center;
  margin-top:30px;
  font-size:40px;
}
</style>
 
</head>
<body>
<h1 id="h1"></h1>
<canvas></canvas>
 
<script>
var canvas = document.querySelector("canvas"),
  ctx = canvas.getContext("2d");
 
var ww,wh;
 
function onResize(){
  ww = canvas.width = window.innerWidth;
  wh = canvas.height = window.innerHeight;
}
 
ctx.strokeStyle = "pink";
ctx.shadowBlur = 25;
ctx.shadowColor = "hsla(0, 100%, 60%,0.5)";
 
var precision = 100;
var hearts = [];
var mouseMoved = false;
function onMove(e){
  mouseMoved = true;
  if(e.type === "touchmove"){
    hearts.push(new Heart(e.touches[0].clientX, e.touches[0].clientY));
    hearts.push(new Heart(e.touches[0].clientX, e.touches[0].clientY));
  }
  else{
    hearts.push(new Heart(e.clientX, e.clientY));
    hearts.push(new Heart(e.clientX, e.clientY));
  }
}
 
var Heart = function(x,y){
  this.x = x || Math.random()*ww;
  this.y = y || Math.random()*wh;
  this.size = Math.random()*2 + 1;
  this.shadowBlur = Math.random() * 10;
  this.speedX = (Math.random()+0.2-0.6) * 8;
  this.speedY = (Math.random()+0.2-0.6) * 8;
  this.speedSize = Math.random()*0.05 + 0.01;
  this.opacity = 1;
  this.vertices = [];
  for (var i = 0; i < precision; i++) {
    var step = (i / precision - 0.5) * (Math.PI * 2);
    var vector = {
      x : (15 * Math.pow(Math.sin(step), 3)),
      y : -(13 * Math.cos(step) - 5 * Math.cos(2 * step) - 2 * Math.cos(3 * step) - Math.cos(4 * step))
    }
    this.vertices.push(vector);
  }
}
 
Heart.prototype.draw = function(){
  this.size -= this.speedSize;
  this.x += this.speedX;
  this.y += this.speedY;
  ctx.save();
  ctx.translate(-1000,this.y);
  ctx.scale(this.size, this.size);
  ctx.beginPath();
  for (var i = 0; i < precision; i++) {
    var vector = this.vertices[i];
    ctx.lineTo(vector.x, vector.y);
  }
  ctx.globalAlpha = this.size;
  ctx.shadowBlur = Math.round((3 - this.size) * 10);
  ctx.shadowColor = "hsla(0, 100%, 60%,0.5)";
  ctx.shadowOffsetX = this.x + 1000;
  ctx.globalCompositeOperation = "screen"
  ctx.closePath();
  ctx.fill()
  ctx.restore();
};
 
 
function render(a){
  requestAnimationFrame(render);
 
  hearts.push(new Heart())
  ctx.clearRect(0,0,ww,wh);
  for (var i = 0; i < hearts.length; i++) {
    hearts[i].draw();
    if(hearts[i].size <= 0){
      hearts.splice(i,1);
      i--;
    }
  }
}
 
 
onResize();
window.addEventListener("mousemove", onMove);
window.addEventListener("touchmove", onMove);
window.addEventListener("resize", onResize);
requestAnimationFrame(render);
 
window.onload=function starttime(){
        time(h1,'2023/1/21');     // 2023年春节时间
        ptimer = setTimeout(starttime,1000); // 添加计时器
}
 
    function time(obj,futimg){
        var nowtime = new Date().getTime(); // 现在时间转换为时间戳
        var futruetime =  new Date(futimg).getTime(); // 未来时间转换为时间戳
        var msec = futruetime-nowtime; // 毫秒 未来时间-现在时间
        var time = (msec/1000);  // 毫秒/1000
        var day = parseInt(time/86400); // 天  24*60*60*1000
        var hour = parseInt(time/3600)-24*day;    // 小时 60*60 总小时数-过去的小时数=现在的小时数
        var minute = parseInt(time%3600/60); // 分 -(day*24) 以60秒为一整份 取余 剩下秒数 秒数/60 就是分钟数
        var second = parseInt(time%60);  // 以60秒为一整份 取余 剩下秒数
        obj.innerHTML="<br>2023年<br>除夕倒计时：<br>"+day+"天"+hour+"小时"+minute+"分"+second+"秒"+"<br><span>善良 勇敢 优秀 决不妥协<br>祝你也祝我<br>"
        return true;
    }
</script>
  <audio id="bgmusic" src="http://music.163.com/song/media/outer/url?id=1851244378.mp3" autoplay="autoplay" loop="loop" style="display: block; width: 3%; height:3%;"></audio>
    <script type="text/javascript">
        document.addEventListener('DOMContentLoaded', function () {
            function audioAutoPlay() {
                var audio = document.getElementById('bgmusic');
                audio.play();
                document.addEventListener("WeixinJSBridgeReady", function () {
                    audio.play();
                    }, false);
                 }
                 audioAutoPlay();
                 });
</script>
</body>
</html>

宇宙星空-效果展示

在这里插入图片描述

距离2023.1.1还有27天（天数我是乱写的，并不是按照文章发布时间来写的，大家可以自己修改源码）

1.源码

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
 
 
    <script>
        var count = document.getElementsByClassName('main');
        var times0 = document.getElementsByClassName('time');
        var inputtime = +new Date("2023/01/01 00:00:00");
        console.log(inputtime);
 
        var timer = null;
        clearInterval(timer)
        timer = setInterval(countdown,1000)
 
 
        function countdown(){
            var nowtime = +new Date();
            
            var times = parseInt((inputtime - nowtime ) / 1000);
            
            if(times >= 0){
                     
            var d = parseInt(times/60/60/24);
            d = d < 10 ? '0' + d : d ;
 
            var h = parseInt(times/60 /60%24);
            h = h < 10 ? '0' + h : h ;
 
           var m = parseInt(times/60%60);
            m = m < 10 ? '0' + m : m ;
 
            var s = parseInt(times%60);
            s = s < 10 ? '0' + s : s ;
 
            times0[0].innerHTML = d;
            times0[1].innerHTML = h;
            times0[2].innerHTML = m;
            times0[3].innerHTML = s;
            }else{
                clearInterval(timer)
            }
         }               
    </script>
 
 
    <style>
        *{
            margin: 0%;
            padding: 0%;
        }
 
        body{
            height: 100vh;
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .block{
            display: inline-block;
            margin-left: 50px;
        }
        .block p{
            font-size: 40px;
            color: aliceblue;
            font-weight: bolder;
            text-align: center;
        }
        .block a{
            font-size: 20px;
            color: aliceblue;
        }
        #nyc{
            color: aliceblue;
            font-size: 50px;
        }
 
    </style>
</head>
 
 
<body background="图片\10523Q492-0.jpg">
    <div class="main">
        <p id="nyc"> New Year Countdown</p>
        <br>
        
        <div class="block">
            <p class="time">00</p>
            <a>days</a>
        </div>
        <div class="block">
            <p class="time">00</p>
            <a>hours</a>
        </div>
        <div class="block">
            <p class="time">00</p>
            <a>minutes</a>
        </div>
        <div class="block">
            <p class="time">00</p>
            <a>seconds</a>
        </div>
    </div>    
</body>
 
 
</html>

2.思路

创建一个计时器函数, 计算出当前时间和目标时间的距离.

利用"setInterval"方法不断调用计时器函数,达到数字变换, 也就是倒计时的效果.

3.步骤(js部分)

var count = document.getElementsByClassName('main');
         var times0 = document.getElementsByClassName('time');
        
         var inputtime = +new Date("2023/01/01 00:00:00");
         var nowtime = +new Date();
         console.log(inputtime);
 
         var timer = null;
         clearInterval(timer)
         timer = setInterval(countdown,1000)

A."var"定义变量

利用"document.getElementsByClassName()"方法提取中已经创建的元素作为js对象.
类似的方法有:

在这里插入图片描述

B. 获取时间

"+new Date()"方法可以获取当前时间距离"1970年1月1日0时0分0秒’的毫秒数, 利用这点可以获取当前时间.

括号中若添加具体日期(写法: 年/月/日时:分:秒 ), 则可以获取具体日期距离"1970年1月1日0时0分0秒’的毫秒数, 利用这点可以获取目标时间.

function countdown(){
            
            var times = parseInt((inputtime - nowtime ) / 1000);
            
            if(times >= 0){
            var d = parseInt(times/60/60/24);
            d = d < 10 ? '0' + d : d ;
 
            var h = parseInt(times/60 /60%24);
            h = h < 10 ? '0' + h : h ;
 
           var m = parseInt(times/60%60);
            m = m < 10 ? '0' + m : m ;
 
            var s = parseInt(times%60);
            s = s < 10 ? '0' + s : s ;
 
            times0[0].innerHTML = d;
            times0[1].innerHTML = h;
            times0[2].innerHTML = m;
            times0[3].innerHTML = s;
            }else{
                clearInterval(timer)
            }
        }

C.创建计时器函数

计算时间的距离:
(目标时间-当前时间)/1000=时间距离

var times = parseInt((inputtime - nowtime ) / 1000);

时间距离转换成天数,时数,分数,秒数:

并做一个简单判断:

如果计算出来的数字小于10, 则在数字面前添加一个0一保持美观和谐.

var d = parseInt(times/60/60/24);
            d = d < 10 ? '0' + d : d ;
 
            var h = parseInt(times/60 /60%24);
            h = h < 10 ? '0' + h : h ;
 
           var m = parseInt(times/60%60);
            m = m < 10 ? '0' + m : m ;
 
            var s = parseInt(times%60);
            s = s < 10 ? '0' + s : s ;

将计算所得数字添加到页面中:

利用到了 "innerhtml"方法, 主要用于改变中已经定义的元素.

最后做一个总的判断:
如果时间距离大于零, 则做计算, 展现倒计时效果.
如果距离等于零, 则对函数的反复调用停止, 计时终止

if(times >= 0){
 
 
 
 }else{
 clearInterval(timer)
            }

D.反复调用计时器函数

var timer = null;
        clearInterval(timer)
        timer = setInterval(countdown,1000)

var timer = null;
        clearInterval(timer)
        timer = setInterval(countdown,1000)

"setInterval()"方法中有两个参数:

第一个: 将要调用的函数名;
第二个: 调用的间隔时间, 单位为一毫秒, 自然, “1000"即代表"1秒钟调用一次”
"clearInterval(timer)"指在调用之前将调用器归零

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3.步骤(js部分)

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