可将以下代码复制至文本文件，并将后缀改为.html，采用浏览器打开即可观看动态效果。
代码雨
<!DOCTYPE html>
<html>
<head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8"><title>代码雨</title><style type="text/css">html, body {width: 100%;height: 100%;}body {background: #000;overflow: hidden;margin: 0;padding: 0;}</style>
</head><body>
<canvas id="cvs"></canvas>
<script type="text/javascript">var cvs = document.getElementById("cvs");var ctx = cvs.getContext("2d");var cw = cvs.width = document.body.clientWidth;var ch = cvs.height = document.body.clientHeight;//动画绘制对象var requestAnimationFrame = window.requestAnimationFrame || window.mozRequestAnimationFrame || window.webkitRequestAnimationFrame || window.msRequestAnimationFrame;var codeRainArr = []; //代码雨数组var cols = parseInt(cw / 14); //代码雨列数var step = 16; //步长，每一列内部数字之间的上下间隔ctx.font = "bold 26px microsoft yahei"; //声明字体，个人喜欢微软雅黑function createColorCv() {//画布基本颜色ctx.fillStyle = "#242424";ctx.fillRect(0, 0, cw, ch);}//创建代码雨function createCodeRain() {for (var n = 0; n < cols; n++) {var col = [];//基础位置，为了列与列之间产生错位var basePos = parseInt(Math.random() * 300);//随机速度 3~13之间var speed = parseInt(Math.random() * 10) + 3;//每组的x轴位置随机产生var colx = parseInt(Math.random() * cw)//绿色随机var rgbr = 0;var rgbg = parseInt(Math.random() * 255);var rgbb = 0;//ctx.fillStyle = "rgb("+r+','+g+','+b+")"for (var i = 0; i < parseInt(ch / step) / 2; i++) {var code = {x: colx,y: -(step * i) - basePos,speed: speed,// text : parseInt(Math.random()*10)%2 == 0 ? 0 : 1 //随机生成0或者1text: ["0", "1", "1", "0", "1", "0", "1", "0", "1", "0", "0", "1", "1", "0", "0", "1", "0", "1", "0", "0", "", "1", "0", "0", "1"][parseInt(Math.random() * 11)], //随机生成字母数组中的一个color: "rgb(" + rgbr + ',' + rgbg + ',' + rgbb + ")"}col.push(code);}codeRainArr.push(col);}}//代码雨下起来function codeRaining() {//把画布擦干净ctx.clearRect(0, 0, cw, ch);//创建有颜色的画布//createColorCv();for (var n = 0; n < codeRainArr.length; n++) {//取出列col = codeRainArr[n];//遍历列，画出该列的代码for (var i = 0; i < col.length; i++) {var code = col[i];if (code.y > ch) {//如果超出下边界则重置到顶部code.y = 0;} else {//匀速降落code.y += code.speed;}//1 颜色也随机变化//ctx.fillStyle = "hsl("+(parseInt(Math.random()*359)+1)+",30%,"+(50-i*2)+"%)"; //2 绿色逐渐变浅// ctx.fillStyle = "hsl(123,80%,"+(30-i*2)+"%)"; //3 绿色随机// var r= 0;// var g= parseInt(Math.random()*255) + 3;// var b= 0;// ctx.fillStyle = "rgb("+r+','+g+','+b+")";//4 一致绿ctx.fillStyle = code.color;//把代码画出来ctx.fillText(code.text, code.x, code.y);}}requestAnimationFrame(codeRaining);}//创建代码雨createCodeRain();//开始下雨吧 GO>>requestAnimationFrame(codeRaining);
</script>
</body>
</html>
花瓣雨
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>2020年最好看的花瓣</TITLE><META NAME="Generator" CONTENT="EditPlus"><META NAME="Author" CONTENT=""><META NAME="Keywords" CONTENT=""><META NAME="Description" CONTENT=""><style>html, body{width: 100%;height: 100%;margin: 0;padding: 0;overflow: hidden;
}
.container{width: 100%;height: 100%;margin: 0;padding: 0;background-color: #000000;
}</style><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script></HEAD><BODY><div id="jsi-cherry-container" class="container"></div><script>var RENDERER = {INIT_CHERRY_BLOSSOM_COUNT : 30,MAX_ADDING_INTERVAL : 10,init : function(){this.setParameters();this.reconstructMethods();this.createCherries();this.render();},setParameters : function(){this.$container = $('#jsi-cherry-container');this.width = this.$container.width();this.height = this.$container.height();this.context = $('<canvas />').attr({width : this.width, height : this.height}).appendTo(this.$container).get(0).getContext('2d');this.cherries = [];this.maxAddingInterval = Math.round(this.MAX_ADDING_INTERVAL * 1000 / this.width);this.addingInterval = this.maxAddingInterval;},reconstructMethods : function(){this.render = this.render.bind(this);},createCherries : function(){for(var i = 0, length = Math.round(this.INIT_CHERRY_BLOSSOM_COUNT * this.width / 1000); i < length; i++){this.cherries.push(new CHERRY_BLOSSOM(this, true));}},render : function(){requestAnimationFrame(this.render);this.context.clearRect(0, 0, this.width, this.height);this.cherries.sort(function(cherry1, cherry2){return cherry1.z - cherry2.z;});for(var i = this.cherries.length - 1; i >= 0; i--){if(!this.cherries[i].render(this.context)){this.cherries.splice(i, 1);}}if(--this.addingInterval == 0){this.addingInterval = this.maxAddingInterval;this.cherries.push(new CHERRY_BLOSSOM(this, false));}}
};
var CHERRY_BLOSSOM = function(renderer, isRandom){this.renderer = renderer;this.init(isRandom);
};
CHERRY_BLOSSOM.prototype = {FOCUS_POSITION : 300,FAR_LIMIT : 600,MAX_RIPPLE_COUNT : 100,RIPPLE_RADIUS : 100,SURFACE_RATE : 0.5,SINK_OFFSET : 20,init : function(isRandom){this.x = this.getRandomValue(-this.renderer.width, this.renderer.width);this.y = isRandom ? this.getRandomValue(0, this.renderer.height) : this.renderer.height * 1.5;this.z = this.getRandomValue(0, this.FAR_LIMIT);this.vx = this.getRandomValue(-2, 2);this.vy = -2;this.theta = this.getRandomValue(0, Math.PI * 2);this.phi = this.getRandomValue(0, Math.PI * 2);this.psi = 0;this.dpsi = this.getRandomValue(Math.PI / 600, Math.PI / 300);this.opacity = 0;this.endTheta = false;this.endPhi = false;this.rippleCount = 0;var axis = this.getAxis(),theta = this.theta + Math.ceil(-(this.y + this.renderer.height * this.SURFACE_RATE) / this.vy) * Math.PI / 500;theta %= Math.PI * 2;this.offsetY = 40 * ((theta <= Math.PI / 2 || theta >= Math.PI * 3 / 2) ? -1 : 1);this.thresholdY = this.renderer.height / 2 + this.renderer.height * this.SURFACE_RATE * axis.rate;this.entityColor = this.renderer.context.createRadialGradient(0, 40, 0, 0, 40, 80);this.entityColor.addColorStop(0, 'hsl(330, 70%, ' + 50 * (0.3 + axis.rate) + '%)');this.entityColor.addColorStop(0.05, 'hsl(330, 40%,' + 55 * (0.3 + axis.rate) + '%)');this.entityColor.addColorStop(1, 'hsl(330, 20%, ' + 70 * (0.3 + axis.rate) + '%)');this.shadowColor = this.renderer.context.createRadialGradient(0, 40, 0, 0, 40, 80);this.shadowColor.addColorStop(0, 'hsl(330, 40%, ' + 30 * (0.3 + axis.rate) + '%)');this.shadowColor.addColorStop(0.05, 'hsl(330, 40%,' + 30 * (0.3 + axis.rate) + '%)');this.shadowColor.addColorStop(1, 'hsl(330, 20%, ' + 40 * (0.3 + axis.rate) + '%)');},getRandomValue : function(min, max){return min + (max - min) * Math.random();},getAxis : function(){var rate = this.FOCUS_POSITION / (this.z + this.FOCUS_POSITION),x = this.renderer.width / 2 + this.x * rate,y = this.renderer.height / 2 - this.y * rate;return {rate : rate, x : x, y : y};},renderCherry : function(context, axis){context.beginPath();context.moveTo(0, 40);context.bezierCurveTo(-60, 20, -10, -60, 0, -20);context.bezierCurveTo(10, -60, 60, 20, 0, 40);context.fill();for(var i = -4; i < 4; i++){context.beginPath();context.moveTo(0, 40);context.quadraticCurveTo(i * 12, 10, i * 4, -24 + Math.abs(i) * 2);context.stroke();}},render : function(context){var axis = this.getAxis();if(axis.y == this.thresholdY && this.rippleCount < this.MAX_RIPPLE_COUNT){context.save();context.lineWidth = 2;context.strokeStyle = 'hsla(0, 0%, 100%, ' + (this.MAX_RIPPLE_COUNT - this.rippleCount) / this.MAX_RIPPLE_COUNT + ')';context.translate(axis.x + this.offsetY * axis.rate * (this.theta <= Math.PI ? -1 : 1), axis.y);context.scale(1, 0.3);context.beginPath();context.arc(0, 0, this.rippleCount / this.MAX_RIPPLE_COUNT * this.RIPPLE_RADIUS * axis.rate, 0, Math.PI * 2, false);context.stroke();context.restore();this.rippleCount++;}if(axis.y < this.thresholdY || (!this.endTheta || !this.endPhi)){if(this.y <= 0){this.opacity = Math.min(this.opacity + 0.01, 1);}context.save();context.globalAlpha = this.opacity;context.fillStyle = this.shadowColor;context.strokeStyle = 'hsl(330, 30%,' + 40 * (0.3 + axis.rate) + '%)';context.translate(axis.x, Math.max(axis.y, this.thresholdY + this.thresholdY - axis.y));context.rotate(Math.PI - this.theta);context.scale(axis.rate * -Math.sin(this.phi), axis.rate);context.translate(0, this.offsetY);this.renderCherry(context, axis);context.restore();}context.save();context.fillStyle = this.entityColor;context.strokeStyle = 'hsl(330, 40%,' + 70 * (0.3 + axis.rate) + '%)';context.translate(axis.x, axis.y + Math.abs(this.SINK_OFFSET * Math.sin(this.psi) * axis.rate));context.rotate(this.theta);context.scale(axis.rate * Math.sin(this.phi), axis.rate);context.translate(0, this.offsetY);this.renderCherry(context, axis);context.restore();if(this.y <= -this.renderer.height / 4){if(!this.endTheta){for(var theta = Math.PI / 2, end = Math.PI * 3 / 2; theta <= end; theta += Math.PI){if(this.theta < theta && this.theta + Math.PI / 200 > theta){this.theta = theta;this.endTheta = true;break;}}}if(!this.endPhi){for(var phi = Math.PI / 8, end = Math.PI * 7 / 8; phi <= end; phi += Math.PI * 3 / 4){if(this.phi < phi && this.phi + Math.PI / 200 > phi){this.phi = Math.PI / 8;this.endPhi = true;break;}}}}if(!this.endTheta){if(axis.y == this.thresholdY){this.theta += Math.PI / 200 * ((this.theta < Math.PI / 2 || (this.theta >= Math.PI && this.theta < Math.PI * 3 / 2)) ? 1 : -1);}else{this.theta += Math.PI / 500;}this.theta %= Math.PI * 2;}if(this.endPhi){if(this.rippleCount == this.MAX_RIPPLE_COUNT){this.psi += this.dpsi;this.psi %= Math.PI * 2;}}else{this.phi += Math.PI / ((axis.y == this.thresholdY) ? 200 : 500);this.phi %= Math.PI;}if(this.y <= -this.renderer.height * this.SURFACE_RATE){this.x += 2;this.y = -this.renderer.height * this.SURFACE_RATE;}else{this.x += this.vx;this.y += this.vy;}return this.z > -this.FOCUS_POSITION && this.z < this.FAR_LIMIT && this.x < this.renderer.width * 1.5;}
};
$(function(){RENDERER.init();
});</script></BODY>
</HTML>
粒子风暴
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>想要更多好玩代码来裙：906407826</title><style>
html,body{margin:0px;width:100%;height:100%;overflow:hidden;background:#000;
}#canvas{position:absolute;width:100%;height:100%;
}
</style></head>
<body><canvas id="canvas"></canvas><script>
function project3D(x,y,z,vars){var p,d;x-=vars.camX;y-=vars.camY-8;z-=vars.camZ;p=Math.atan2(x,z);d=Math.sqrt(x*x+z*z);x=Math.sin(p-vars.yaw)*d;z=Math.cos(p-vars.yaw)*d;p=Math.atan2(y,z);d=Math.sqrt(y*y+z*z);y=Math.sin(p-vars.pitch)*d;z=Math.cos(p-vars.pitch)*d;var rx1=-1000;var ry1=1;var rx2=1000;var ry2=1;var rx3=0;var ry3=0;var rx4=x;var ry4=z;var uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1);var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;if(!z)z=0.000000001;if(ua>0&&ua<1&&ub>0&&ub<1){return {x:vars.cx+(rx1+ua*(rx2-rx1))*vars.scale,y:vars.cy+y/z*vars.scale,d:(x*x+y*y+z*z)};}else{return { d:-1 };}
}function elevation(x,y,z){var dist = Math.sqrt(x*x+y*y+z*z);if(dist && z/dist>=-1 && z/dist <=1) return Math.acos(z / dist);return 0.00000001;
}function rgb(col){col += 0.000001;var r = parseInt((0.5+Math.sin(col)*0.5)*16);var g = parseInt((0.5+Math.cos(col)*0.5)*16);var b = parseInt((0.5-Math.sin(col)*0.5)*16);return "#"+r.toString(16)+g.toString(16)+b.toString(16);
}function interpolateColors(RGB1,RGB2,degree){var w2=degree;var w1=1-w2;return [w1*RGB1[0]+w2*RGB2[0],w1*RGB1[1]+w2*RGB2[1],w1*RGB1[2]+w2*RGB2[2]];
}function rgbArray(col){col += 0.000001;var r = parseInt((0.5+Math.sin(col)*0.5)*256);var g = parseInt((0.5+Math.cos(col)*0.5)*256);var b = parseInt((0.5-Math.sin(col)*0.5)*256);return [r, g, b];
}function colorString(arr){var r = parseInt(arr[0]);var g = parseInt(arr[1]);var b = parseInt(arr[2]);return "#"+("0" + r.toString(16) ).slice (-2)+("0" + g.toString(16) ).slice (-2)+("0" + b.toString(16) ).slice (-2);
}function process(vars){if(vars.points.length<vars.initParticles) for(var i=0;i<5;++i) spawnParticle(vars);var p,d,t;p = Math.atan2(vars.camX, vars.camZ);d = Math.sqrt(vars.camX * vars.camX + vars.camZ * vars.camZ);d -= Math.sin(vars.frameNo / 80) / 25;t = Math.cos(vars.frameNo / 300) / 165;vars.camX = Math.sin(p + t) * d;vars.camZ = Math.cos(p + t) * d;vars.camY = -Math.sin(vars.frameNo / 220) * 15;vars.yaw = Math.PI + p + t;vars.pitch = elevation(vars.camX, vars.camZ, vars.camY) - Math.PI / 2;var t;for(var i=0;i<vars.points.length;++i){x=vars.points[i].x;y=vars.points[i].y;z=vars.points[i].z;d=Math.sqrt(x*x+z*z)/1.0075;t=.1/(1+d*d/5);p=Math.atan2(x,z)+t;vars.points[i].x=Math.sin(p)*d;vars.points[i].z=Math.cos(p)*d;vars.points[i].y+=vars.points[i].vy*t*((Math.sqrt(vars.distributionRadius)-d)*2);if(vars.points[i].y>vars.vortexHeight/2 || d<.25){vars.points.splice(i,1);spawnParticle(vars);}}
}function drawFloor(vars){var x,y,z,d,point,a;for (var i = -25; i <= 25; i += 1) {for (var j = -25; j <= 25; j += 1) {x = i*2;z = j*2;y = vars.floor;d = Math.sqrt(x * x + z * z);point = project3D(x, y-d*d/85, z, vars);if (point.d != -1) {size = 1 + 15000 / (1 + point.d);a = 0.15 - Math.pow(d / 50, 4) * 0.15;if (a > 0) {vars.ctx.fillStyle = colorString(interpolateColors(rgbArray(d/26-vars.frameNo/40),[0,128,32],.5+Math.sin(d/6-vars.frameNo/8)/2));vars.ctx.globalAlpha = a;vars.ctx.fillRect(point.x-size/2,point.y-size/2,size,size);}}}} vars.ctx.fillStyle = "#82f";for (var i = -25; i <= 25; i += 1) {for (var j = -25; j <= 25; j += 1) {x = i*2;z = j*2;y = -vars.floor;d = Math.sqrt(x * x + z * z);point = project3D(x, y+d*d/85, z, vars);if (point.d != -1) {size = 1 + 15000 / (1 + point.d);a = 0.15 - Math.pow(d / 50, 4) * 0.15;if (a > 0) {vars.ctx.fillStyle = colorString(interpolateColors(rgbArray(-d/26-vars.frameNo/40),[32,0,128],.5+Math.sin(-d/6-vars.frameNo/8)/2));vars.ctx.globalAlpha = a;vars.ctx.fillRect(point.x-size/2,point.y-size/2,size,size);}}}}
}function sortFunction(a,b){return b.dist-a.dist;
}function draw(vars){vars.ctx.globalAlpha=.15;vars.ctx.fillStyle="#000";vars.ctx.fillRect(0, 0, canvas.width, canvas.height);drawFloor(vars);var point,x,y,z,a;for(var i=0;i<vars.points.length;++i){x=vars.points[i].x;y=vars.points[i].y;z=vars.points[i].z;point=project3D(x,y,z,vars);if(point.d != -1){vars.points[i].dist=point.d;size=1+vars.points[i].radius/(1+point.d);d=Math.abs(vars.points[i].y);a = .8 - Math.pow(d / (vars.vortexHeight/2), 1000) * .8;vars.ctx.globalAlpha=a>=0&&a<=1?a:0;vars.ctx.fillStyle=rgb(vars.points[i].color);if(point.x>-1&&point.x<vars.canvas.width&&point.y>-1&&point.y<vars.canvas.height)vars.ctx.fillRect(point.x-size/2,point.y-size/2,size,size);}}vars.points.sort(sortFunction);
}function spawnParticle(vars){var p,ls;pt={};p=Math.PI*2*Math.random();ls=Math.sqrt(Math.random()*vars.distributionRadius);pt.x=Math.sin(p)*ls;pt.y=-vars.vortexHeight/2;pt.vy=vars.initV/20+Math.random()*vars.initV;pt.z=Math.cos(p)*ls;pt.radius=200+800*Math.random();pt.color=pt.radius/1000+vars.frameNo/250;vars.points.push(pt);
}function frame(vars) {if(vars === undefined){var vars={};vars.canvas = document.querySelector("canvas");vars.ctx = vars.canvas.getContext("2d");vars.canvas.width = document.body.clientWidth;vars.canvas.height = document.body.clientHeight;window.addEventListener("resize", function(){vars.canvas.width = document.body.clientWidth;vars.canvas.height = document.body.clientHeight;vars.cx=vars.canvas.width/2;vars.cy=vars.canvas.height/2;}, true);vars.frameNo=0;vars.camX = 0;vars.camY = 0;vars.camZ = -14;vars.pitch = elevation(vars.camX, vars.camZ, vars.camY) - Math.PI / 2;vars.yaw = 0;vars.cx=vars.canvas.width/2;vars.cy=vars.canvas.height/2;vars.bounding=10;vars.scale=500;vars.floor=26.5;vars.points=[];vars.initParticles=700;vars.initV=.01;vars.distributionRadius=800;vars.vortexHeight=25;}vars.frameNo++;requestAnimationFrame(function() {frame(vars);});process(vars);draw(vars);
}
frame();
</script><div style="text-align:center;margin:50px 0; font:normal 14px/24px 'MicroSoft YaHei';">
<p>适用浏览器：360、FireFox、Chrome、Opera、傲游、搜狗、世界之窗. 不支持Safari、IE8及以下浏览器。</p>
<p><a href="http://sc.chinaz.com/" target="_blank"></a></p>
</div>
</body>
</html>
曙光
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<title>star</title>
<script type="text/javascript">
window.onload = function () {
C = Math.cos; // cache Math objects
S = Math.sin;
U = 0;
w = window;
j = document;
d = j.getElementById("c");
c = d.getContext("2d");
W = d.width = w.innerWidth;
H = d.height = w.innerHeight;
c.fillRect(0, 0, W, H); // resize <canvas> and draw black rect (default)
c.globalCompositeOperation = "lighter"; // switch to additive color application
c.lineWidth = 0.2;
c.lineCap = "round";
var bool = 0,
t = 0; // theta
d.onmousemove = function (e) {
if(window.T) {
if(D==9) { D=Math.random()*15; f(1); }
clearTimeout(T);
}
X = e.pageX; // grab mouse pixel coords
Y = e.pageY;
a=0; // previous coord.x
b=0; // previous coord.y
A = X, // original coord.x
B = Y; // original coord.y
R=(e.pageX/W * 999>>0)/999;
r=(e.pageY/H * 999>>0)/999;
U=e.pageX/H * 360 >>0;
D=9;
g = 360 * Math.PI / 180;
T = setInterval(f = function (e) { // start looping spectrum
c.save();
c.globalCompositeOperation = "source-over"; // switch to additive color application
if(e!=1) {
c.fillStyle = "rgba(0,0,0,0.02)";
c.fillRect(0, 0, W, H); // resize <canvas> and draw black rect (default)
}
c.restore();
i = 25; while(i --) {
c.beginPath();
if(D > 450 || bool) { // decrease diameter
if(!bool) { // has hit maximum
bool = 1;
}
if(D < 0.1) { // has hit minimum
bool = 0;
}
t -= g; // decrease theta
D -= 0.1; // decrease size
}
if(!bool) {
t += g; // increase theta
D += 0.1; // increase size
}
q = (R / r - 1) * t; // create hypotrochoid from current mouse position, and setup variables (see: http://en.wikipedia.org/wiki/Hypotrochoid)
x = (R - r) * C(t) + D * C(q) + (A + (X - A) * (i / 25)) + (r - R); // center on xy coords
y = (R - r) * S(t) - D * S(q) + (B + (Y - B) * (i / 25));
if (a) { // draw once two points are set
c.moveTo(a, b);
c.lineTo(x, y)
}
c.strokeStyle = "hsla(" + (U % 360) + ",100%,50%,0.75)"; // draw rainbow hypotrochoid
c.stroke();
a = x; // set previous coord.x
b = y; // set previous coord.y
}
U -= 0.5; // increment hue
A = X; // set original coord.x
B = Y; // set original coord.y
}, 16);
}
j.onkeydown = function(e) { a=b=0; R += 0.05 }
d.onmousemove({pageX:300, pageY:290})
}</script>
</head><body style="margin:0px;padding:0px;width:100%;height:100%;overflow:hidden;">
<canvas id="c"></canvas>
</body>
</html>
星 空
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>旋转的星空</title>
<style type="text/css">
body{background: black;padding: 0;margin: 0; overflow:hidden}
.header{margin: 0 auto;width: 100%;height: 100%;background-color: #000;position: relative;}
</style>
</head>
<body>
<div class="header"><canvas id="canvas"></canvas></div>
<script>
var canvas = document.getElementById('canvas'),
ctx = canvas.getContext('2d'),
w = canvas.width = window.innerWidth,
h = canvas.height = window.innerHeight,
hue = 217,
stars = [],
count = 0,
maxStars = 3000;//星星数量
var canvas2 = document.createElement('canvas'),
ctx2 = canvas2.getContext('2d');
canvas2.width = 100;
canvas2.height = 100;
var half = canvas2.width / 2,
gradient2 = ctx2.createRadialGradient(half, half, 0, half, half, half);
gradient2.addColorStop(0.025, '#CCC');
gradient2.addColorStop(0.1, 'hsl(' + hue + ', 61%, 33%)');
gradient2.addColorStop(0.25, 'hsl(' + hue + ', 64%, 6%)');
gradient2.addColorStop(1, 'transparent');
ctx2.fillStyle = gradient2;
ctx2.beginPath();
ctx2.arc(half, half, half, 0, Math.PI * 2);
ctx2.fill();
// End cache
function random(min, max) {
if (arguments.length < 2) {
max = min;
min = 0;
}
if (min > max) {
var hold = max;
max = min;
min = hold;
}
return Math.floor(Math.random() * (max - min + 1)) + min;
}
function maxOrbit(x, y) {
var max = Math.max(x, y),
diameter = Math.round(Math.sqrt(max * max + max * max));
return diameter / 2;
//星星移动范围，值越大范围越小，
}
var Star = function() {
this.orbitRadius = random(maxOrbit(w, h));
this.radius = random(60, this.orbitRadius) / 8;
//星星大小
this.orbitX = w / 2;
this.orbitY = h / 2;
this.timePassed = random(0, maxStars);
this.speed = random(this.orbitRadius) / 50000;
//星星移动速度
this.alpha = random(2, 10) / 10;
count++;
stars[count] = this;
}
Star.prototype.draw = function() {
var x = Math.sin(this.timePassed) * this.orbitRadius + this.orbitX,
y = Math.cos(this.timePassed) * this.orbitRadius + this.orbitY,
twinkle = random(10);
if (twinkle === 1 && this.alpha > 0) {
this.alpha -= 0.05;
} else if (twinkle === 2 && this.alpha < 1) {
this.alpha += 0.05;
}
ctx.globalAlpha = this.alpha;
ctx.drawImage(canvas2, x - this.radius / 2, y - this.radius / 2, this.radius, this.radius);
this.timePassed += this.speed;
}
for (var i = 0; i < maxStars; i++) {
new Star();
}
function animation() {
ctx.globalCompositeOperation = 'source-over';
ctx.globalAlpha = 0.5; //尾巴
ctx.fillStyle = 'hsla(' + hue + ', 64%, 6%, 2)';
ctx.fillRect(0, 0, w, h)
ctx.globalCompositeOperation = 'lighter';
for (var i = 1, l = stars.length; i < l; i++) {
stars[i].draw();
};
window.requestAnimationFrame(animation);
}
animation();
</script>
</body>
</html>
烟花
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Canvas绘制3D烟花动画特效</title><style>
html,body{margin:0px;width:100%;height:100%;overflow:hidden;background:#000;
}#canvas{width:100%;height:100%;
}
</style></head>
<body><canvas id="canvas"></canvas><script>
function initVars(){pi=Math.PI;ctx=canvas.getContext("2d");canvas.width=canvas.clientWidth;canvas.height=canvas.clientHeight;cx=canvas.width/2;cy=canvas.height/2;playerZ=-25;playerX=playerY=playerVX=playerVY=playerVZ=pitch=yaw=pitchV=yawV=0;scale=600;seedTimer=0;seedInterval=5,seedLife=100;gravity=.02;seeds=new Array();sparkPics=new Array();s="https://cantelope.org/NYE/";for(i=1;i<=10;++i){sparkPic=new Image();sparkPic.src=s+"spark"+i+".png";sparkPics.push(sparkPic);}sparks=new Array();pow1=new Audio(s+"pow1.ogg");pow2=new Audio(s+"pow2.ogg");pow3=new Audio(s+"pow3.ogg");pow4=new Audio(s+"pow4.ogg");frames = 0;
}function rasterizePoint(x,y,z){var p,d;x-=playerX;y-=playerY;z-=playerZ;p=Math.atan2(x,z);d=Math.sqrt(x*x+z*z);x=Math.sin(p-yaw)*d;z=Math.cos(p-yaw)*d;p=Math.atan2(y,z);d=Math.sqrt(y*y+z*z);y=Math.sin(p-pitch)*d;z=Math.cos(p-pitch)*d;var rx1=-1000,ry1=1,rx2=1000,ry2=1,rx3=0,ry3=0,rx4=x,ry4=z,uc=(ry4-ry3)*(rx2-rx1)-(rx4-rx3)*(ry2-ry1);if(!uc) return {x:0,y:0,d:-1};var ua=((rx4-rx3)*(ry1-ry3)-(ry4-ry3)*(rx1-rx3))/uc;var ub=((rx2-rx1)*(ry1-ry3)-(ry2-ry1)*(rx1-rx3))/uc;if(!z)z=.000000001;if(ua>0&&ua<1&&ub>0&&ub<1){return {x:cx+(rx1+ua*(rx2-rx1))*scale,y:cy+y/z*scale,d:Math.sqrt(x*x+y*y+z*z)};}else{return {x:cx+(rx1+ua*(rx2-rx1))*scale,y:cy+y/z*scale,d:-1};}
}function spawnSeed(){seed=new Object();seed.x=-50+Math.random()*100;seed.y=25;seed.z=-50+Math.random()*100;seed.vx=.1-Math.random()*.2;seed.vy=-1.5;//*(1+Math.random()/2);seed.vz=.1-Math.random()*.2;seed.born=frames;seeds.push(seed);
}function splode(x,y,z){t=5+parseInt(Math.random()*150);sparkV=1+Math.random()*2.5;type=parseInt(Math.random()*3);switch(type){case 0:pic1=parseInt(Math.random()*10);break;case 1:pic1=parseInt(Math.random()*10);do{ pic2=parseInt(Math.random()*10); }while(pic2==pic1);break;case 2:pic1=parseInt(Math.random()*10);do{ pic2=parseInt(Math.random()*10); }while(pic2==pic1);do{ pic3=parseInt(Math.random()*10); }while(pic3==pic1 || pic3==pic2);break;}for(m=1;m<t;++m){spark=new Object();spark.x=x; spark.y=y; spark.z=z;p1=pi*2*Math.random();p2=pi*Math.random();v=sparkV*(1+Math.random()/6)spark.vx=Math.sin(p1)*Math.sin(p2)*v;spark.vz=Math.cos(p1)*Math.sin(p2)*v;spark.vy=Math.cos(p2)*v;switch(type){case 0: spark.img=sparkPics[pic1]; break;case 1:spark.img=sparkPics[parseInt(Math.random()*2)?pic1:pic2];break;case 2:switch(parseInt(Math.random()*3)){case 0: spark.img=sparkPics[pic1]; break;case 1: spark.img=sparkPics[pic2]; break;case 2: spark.img=sparkPics[pic3]; break;}break;}spark.radius=25+Math.random()*50;spark.alpha=1;spark.trail=new Array();sparks.push(spark);}switch(parseInt(Math.random()*4)){case 0: pow=new Audio(s+"pow1.ogg"); break;case 1: pow=new Audio(s+"pow2.ogg"); break;case 2: pow=new Audio(s+"pow3.ogg"); break;case 3: pow=new Audio(s+"pow4.ogg"); break;}d=Math.sqrt((x-playerX)*(x-playerX)+(y-playerY)*(y-playerY)+(z-playerZ)*(z-playerZ));pow.volume=1.5/(1+d/10);pow.play();
}function doLogic(){if(seedTimer<frames){seedTimer=frames+seedInterval*Math.random()*10;spawnSeed();}for(i=0;i<seeds.length;++i){seeds[i].vy+=gravity;seeds[i].x+=seeds[i].vx;seeds[i].y+=seeds[i].vy;seeds[i].z+=seeds[i].vz;if(frames-seeds[i].born>seedLife){splode(seeds[i].x,seeds[i].y,seeds[i].z);seeds.splice(i,1);}}for(i=0;i<sparks.length;++i){if(sparks[i].alpha>0 && sparks[i].radius>5){sparks[i].alpha-=.01;sparks[i].radius/=1.02;sparks[i].vy+=gravity;point=new Object();point.x=sparks[i].x;point.y=sparks[i].y;point.z=sparks[i].z;if(sparks[i].trail.length){x=sparks[i].trail[sparks[i].trail.length-1].x;y=sparks[i].trail[sparks[i].trail.length-1].y;z=sparks[i].trail[sparks[i].trail.length-1].z;d=((point.x-x)*(point.x-x)+(point.y-y)*(point.y-y)+(point.z-z)*(point.z-z));if(d>9){sparks[i].trail.push(point);}}else{sparks[i].trail.push(point);}if(sparks[i].trail.length>5)sparks[i].trail.splice(0,1); sparks[i].x+=sparks[i].vx;sparks[i].y+=sparks[i].vy;sparks[i].z+=sparks[i].vz;sparks[i].vx/=1.075;sparks[i].vy/=1.075;sparks[i].vz/=1.075;}else{sparks.splice(i,1);}}p=Math.atan2(playerX,playerZ);d=Math.sqrt(playerX*playerX+playerZ*playerZ);d+=Math.sin(frames/80)/1.25;t=Math.sin(frames/200)/40;playerX=Math.sin(p+t)*d;playerZ=Math.cos(p+t)*d;yaw=pi+p+t;
}function rgb(col){var r = parseInt((.5+Math.sin(col)*.5)*16);var g = parseInt((.5+Math.cos(col)*.5)*16);var b = parseInt((.5-Math.sin(col)*.5)*16);return "#"+r.toString(16)+g.toString(16)+b.toString(16);
}function draw(){ctx.clearRect(0,0,cx*2,cy*2);ctx.fillStyle="#ff8";for(i=-100;i<100;i+=3){for(j=-100;j<100;j+=4){x=i;z=j;y=25;point=rasterizePoint(x,y,z);if(point.d!=-1){size=250/(1+point.d);d = Math.sqrt(x * x + z * z);a = 0.75 - Math.pow(d / 100, 6) * 0.75;if(a>0){ctx.globalAlpha = a;ctx.fillRect(point.x-size/2,point.y-size/2,size,size); }}}}ctx.globalAlpha=1;for(i=0;i<seeds.length;++i){point=rasterizePoint(seeds[i].x,seeds[i].y,seeds[i].z);if(point.d!=-1){size=200/(1+point.d);ctx.fillRect(point.x-size/2,point.y-size/2,size,size);}}point1=new Object();for(i=0;i<sparks.length;++i){point=rasterizePoint(sparks[i].x,sparks[i].y,sparks[i].z);if(point.d!=-1){size=sparks[i].radius*200/(1+point.d);if(sparks[i].alpha<0)sparks[i].alpha=0;if(sparks[i].trail.length){point1.x=point.x;point1.y=point.y;switch(sparks[i].img){case sparkPics[0]:ctx.strokeStyle="#f84";break;case sparkPics[1]:ctx.strokeStyle="#84f";break;case sparkPics[2]:ctx.strokeStyle="#8ff";break;case sparkPics[3]:ctx.strokeStyle="#fff";break;case sparkPics[4]:ctx.strokeStyle="#4f8";break;case sparkPics[5]:ctx.strokeStyle="#f44";break;case sparkPics[6]:ctx.strokeStyle="#f84";break;case sparkPics[7]:ctx.strokeStyle="#84f";break;case sparkPics[8]:ctx.strokeStyle="#fff";break;case sparkPics[9]:ctx.strokeStyle="#44f";break;}for(j=sparks[i].trail.length-1;j>=0;--j){point2=rasterizePoint(sparks[i].trail[j].x,sparks[i].trail[j].y,sparks[i].trail[j].z);if(point2.d!=-1){ctx.globalAlpha=j/sparks[i].trail.length*sparks[i].alpha/2;ctx.beginPath();ctx.moveTo(point1.x,point1.y);ctx.lineWidth=1+sparks[i].radius*10/(sparks[i].trail.length-j)/(1+point2.d);ctx.lineTo(point2.x,point2.y);ctx.stroke();point1.x=point2.x;point1.y=point2.y;}}}ctx.globalAlpha=sparks[i].alpha;ctx.drawImage(sparks[i].img,point.x-size/2,point.y-size/2,size,size);}}
}function frame(){if(frames>100000){seedTimer=0;frames=0;}frames++;draw();doLogic();requestAnimationFrame(frame);
}window.addEventListener("resize",()=>{canvas.width=canvas.clientWidth;canvas.height=canvas.clientHeight;cx=canvas.width/2;cy=canvas.height/2;
});initVars();
frame();
</script></body>
</html>
