2023年最新html5cavnas新年倒计时烟花动画特效

效果图

 利用html5cavnas实现烟花特效，文字特效，新年倒计时，月亮动画特效

 1.找素材背景

百度搜了几张图片

2.抠图

网上找了在线美图秀秀，发现要钱，就顺便po解了一下，扣出素材

 3.编写代码

添加代码结构
 

<div id="h1"></div>
<div style="height:100vh;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 class='img1' src="img/city.png"/>
        <img class='img2' src="img/build.png"/>
        <img class='img3' src="img/dfmz.png"/>
    </div>
    <img src="img/moon.png" id="myoon"  />
    <img src="img/man.png" id="person"/>
    <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 class="shape">四海增辉</div>
        <div class="shape">鹏程万里</div>
        <div class="shape">五福临门</div>
        <div class="shape">六六大顺</div>
        <div class="shape">步步高升</div>
    </div>
</div>

4.添加样式

     

   body{margin:0;padding:0;overflow: hidden;background-color: black;}
        .city{
            width:100%;
            height:50vh;
        position:fixed;
        bottom: -12vh;
        z-index: 100; 
    }
    .img1{
        position:absolute;
        z-index: 998;
        left:  20vw;
        width: 60vw;
        height: 80vh;
        bottom: -30vh;
    }
    .img2{
        position:absolute;
        z-index: 997;
        height: 15vw;
        right:  0;
        bottom: 5vh;
    }
    .img3{
        position:absolute;
        z-index: 999;
        height: 30vw;
        left:  0;
        bottom: 5vh;
    }
    #person{
        position: fixed;top: 70px;right: 180px;width: 200px;height: 200px;
        -webkit-transform: rotate(-15deg);
    }
    #myoon{
        position: fixed;top: 30px;right: 150px;width: 240px;height: 240px;
        border-radius:240px;
        border: 0;
        -webkit-animation: spin 100s linear infinite,light 100s  linear infinite;
    }
        /* 光晕效果 */
    @-webkit-keyframes light {
     from { background-color:rgba(255,255,255,0.8); -webkit-box-shadow: 0 0 5vw rgba(255,255,255,0.7); }
     50% { background-color: rgba(255,255,255,0.7); -webkit-box-shadow: 0 0 10vw rgba(255,255,255,0.5); }
     to { background-color:  rgba(255,255,255,0.6); -webkit-box-shadow: 0 0 15vw rgba(255,255,255,0.3); }
    }
    /* 旋转动画 */
    @-webkit-keyframes spin {
        0% {
        -webkit-transform: rotate(0deg);
        -ms-transform: rotate(0deg);
        transform: rotate(0deg);
        }
        100% {
        -webkit-transform: rotate(360deg);
        -ms-transform: rotate(360deg);
        transform: rotate(360deg);
        }
    }
    /* 倒计时 */
    #h1{
      display: block;
      position: fixed;
      font-family: 'Love Ya Like A Sister', cursive;
      font-size: 2vw;
      font-weight: bolder;
      background-color: transparent;
      color: red;
      padding:  20px;
    }
    #h1 span{
        font-family: 'Times New Roman', Times, serif;
        color: white;
        font-size: 3vw;
    }

5.添加烟花js

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 = window.innerHeight;
		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>5?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();
			})
 
 
			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);
		}
 
		
		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)
		}
 
 
		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(50 , 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(10 , 500);
				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, 500));
				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();
			}
		}

6.添加倒计时js

		  var ptimer = setInterval(  function time(){
		
		        var nowtime = new Date().getTime(); // 现在时间转换为时间戳
		
		        var futruetime =  new Date('2023,01,01').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
				
		        document.getElementById('h1').innerHTML="距离2023年还有<span >"+day+"</span>天<span >"+hour+"</span>小时<span >"+minute+"</span>分<span >"+second+"</span>秒";
		        return true;
		
		    },0,1000); // 添加计时器

7.添加音效

<audio autoplay="autoplay"  loop><source src="写资源地址，这里放的鞭炮"></audio>
<audio autoplay="autoplay" ><source src="写资源地址，这里放的锣鼓”></audio>