web前端|js教程
html+css,JQuery,样式表,css,鼠标,实现,点击
web前端-js教程
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5253 O(∩_∩)O~~ 54 同 55 学 56 们 57 节 58 日 59 快 60 乐 61 ~~ 6263
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鼠标点击释放烟花效果
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66 67 68var aLi=document.querySelectorAll("li"); 69setInterval(a,1000); 70setInterval(b,2000); 71setInterval(c,3000); 72setInterval(d,4000); 73setInterval(e,5000); 74setInterval(f,6000); 75setInterval(g,7000); 76setInterval(h,8000); 77function a() { 78 aLi[0].style.display = "block" 79} 80function b() { 81 aLi[1].style.display = "block" 82} 83function c() { 84 aLi[2].style.display = "block" 85} 86function d() { 87 aLi[3].style.display = "block" 88} 89function e() { 90 aLi[4].style.display = "block" 91} 92function f() { 93 aLi[5].style.display = "block" 94} 95function g() { 96 aLi[6].style.display = "block" 97} 98function h() { 99 aLi[7].style.display = "block"100}101$(function(){102 var Fireworks = function(){103 var self = this;104 var rand = function(rMi, rMa){return ~~((Math.random()*(rMa-rMi+1))+rMi);}105 var hitTest = function(x1, y1, w1, h1, x2, y2, w2, h2){return !(x1 + w1 < x2 || x2 + w2 < x1 || y1 + h1 < y2 || y2 + h2 < y1);};106 window.requestAnimFrame=function(){return window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.oRequestAnimationFrame||window.msRequestAnimationFrame||function(a){window.setTimeout(a,1E3/60)}}();107 108 self.init = function(){109 self.canvas = document.createElement(canvas);110 self.canvas.width = self.cw = $(window).innerWidth();111 self.canvas.height = self.ch = $(window).innerHeight();112 self.particles = [];113 self.partCount = 150;114 self.fireworks = [];115 self.mx = self.cw/2;116 self.my = self.ch/2;117 self.currentHue = 30;118 self.partSpeed = 5;119 self.partSpeedVariance = 10;120 self.partWind = 50;121 self.partFriction = 5;122 self.partGravity = 1;123 self.hueMin = 0;124 self.hueMax = 360;125 self.fworkSpeed = 4;126 self.fworkAccel = 10;127 self.hueVariance = 30;128 self.flickerDensity = 25;129 self.showShockwave = true;130 self.showTarget = false;131 self.clearAlpha = 25;132 133 $(document.body).append(self.canvas);134 self.ctx = self.canvas.getContext(2d);135 self.ctx.lineCap = ound;136 self.ctx.lineJoin = ound;137 self.lineWidth = 1;138 self.bindEvents();139 self.canvasLoop();140 141 self.canvas.onselectstart = function() {142return false;143 };144 };145 146 self.createParticles = function(x,y, hue){147 var countdown = self.partCount;148 while(countdown--){149var newParticle = {150 x: x,151 y: y,152 coordLast: [153 {x: x, y: y},154 {x: x, y: y},155 {x: x, y: y}156 ],157 angle: rand(0, 360),158 speed: rand(((self.partSpeed - self.partSpeedVariance) <= 0) ? 1 : self.partSpeed - self.partSpeedVariance, (self.partSpeed + self.partSpeedVariance)),159 friction: 1 - self.partFriction/100,160 gravity: self.partGravity/2,161 hue: rand(hue-self.hueVariance, hue+self.hueVariance),162 brightness: rand(50, 80),163 alpha: rand(40,100)/100,164 decay: rand(10, 50)/1000,165 wind: (rand(0, self.partWind) - (self.partWind/2))/25,166 lineWidth: self.lineWidth167};168self.particles.push(newParticle);169 }170 };171 172 173 self.updateParticles = function(){174 var i = self.particles.length;175 while(i--){176var p = self.particles[i];177var radians = p.angle * Math.PI / 180;178var vx = Math.cos(radians) * p.speed;179var vy = Math.sin(radians) * p.speed;180p.speed *= p.friction;181 182p.coordLast[2].x = p.coordLast[1].x;183p.coordLast[2].y = p.coordLast[1].y;184p.coordLast[1].x = p.coordLast[0].x;185p.coordLast[1].y = p.coordLast[0].y;186p.coordLast[0].x = p.x;187p.coordLast[0].y = p.y;188 189p.x += vx;190p.y += vy;191p.y += p.gravity;192 193p.angle += p.wind;194p.alpha -= p.decay;195 196if(!hitTest(0,0,self.cw,self.ch,p.x-p.radius, p.y-p.radius, p.radius*2, p.radius*2) || p.alpha 0){216 var inverseDensity = 50 - self.flickerDensity;217 if(rand(0, inverseDensity) === inverseDensity){218 self.ctx.beginPath();219 self.ctx.arc(Math.round(p.x), Math.round(p.y), rand(p.lineWidth,p.lineWidth+3)/2, 0, Math.PI*2, false)220 self.ctx.closePath();221 var randAlpha = rand(50,100)/100;222 self.ctx.fillStyle = hsla(+p.hue+, 100%, +p.brightness+\%, +randAlpha+);223 self.ctx.fill();224 }225}226 };227 };228 229 230 self.createFireworks = function(startX, startY, targetX, targetY){231 var newFirework = {232x: startX,233y: startY,234startX: startX,235startY: startY,236hitX: false,237hitY: false,238coordLast: [239 {x: startX, y: startY},240 {x: startX, y: startY},241 {x: startX, y: startY}242],243targetX: targetX,244targetY: targetY,245speed: self.fworkSpeed,246angle: Math.atan2(targetY - startY, targetX - startX),247shockwaveAngle: Math.atan2(targetY - startY, targetX - startX)+(90*(Math.PI/180)),248acceleration: self.fworkAccel/100,249hue: self.currentHue,250brightness: rand(50, 80),251alpha: rand(50,100)/100,252lineWidth: self.lineWidth253 };254 self.fireworks.push(newFirework);255 256 };257 258 259 self.updateFireworks = function(){260 var i = self.fireworks.length;261 262 while(i--){263var f = self.fireworks[i];264self.ctx.lineWidth = f.lineWidth;265 266vx = Math.cos(f.angle) * f.speed,267 vy = Math.sin(f.angle) * f.speed;268f.speed *= 1 + f.acceleration;269f.coordLast[2].x = f.coordLast[1].x;270f.coordLast[2].y = f.coordLast[1].y;271f.coordLast[1].x = f.coordLast[0].x;272f.coordLast[1].y = f.coordLast[0].y;273f.coordLast[0].x = f.x;274f.coordLast[0].y = f.y;275 276if(f.startX >= f.targetX){277 if(f.x + vx = f.targetX){285 f.x = f.targetX;286 f.hitX = true;287 } else {288 f.x += vx;289 }290}291 292if(f.startY >= f.targetY){293 if(f.y + vy = f.targetY){301 f.y = f.targetY;302 f.hitY = true;303 } else {304 f.y += vy;305 }306}307 308if(f.hitX && f.hitY){309 self.createParticles(f.targetX, f.targetY, f.hue);310 self.fireworks.splice(i, 1);311 312}313 };314 };315 316 self.drawFireworks = function(){317 var i = self.fireworks.length;318 self.ctx.globalCompositeOperation = lighter;319 while(i--){320var f = self.fireworks[i];321self.ctx.lineWidth = f.lineWidth;322 323var coordRand = (rand(1,3)-1);324self.ctx.beginPath();325self.ctx.moveTo(Math.round(f.coordLast[coordRand].x), Math.round(f.coordLast[coordRand].y));326self.ctx.lineTo(Math.round(f.x), Math.round(f.y));327self.ctx.closePath();328self.ctx.strokeStyle = hsla(+f.hue+, 100%, +f.brightness+\%, +f.alpha+);329self.ctx.stroke();330 331if(self.showTarget){332 self.ctx.save();333 self.ctx.beginPath();334 self.ctx.arc(Math.round(f.targetX), Math.round(f.targetY), rand(1,8), 0, Math.PI*2, false)335 self.ctx.closePath();336 self.ctx.lineWidth = 1;337 self.ctx.stroke();338 self.ctx.restore();339}340 341if(self.showShockwave){342 self.ctx.save();343 self.ctx.translate(Math.round(f.x), Math.round(f.y));344 self.ctx.rotate(f.shockwaveAngle);345 self.ctx.beginPath();346 self.ctx.arc(0, 0, 1*(f.speed/5), 0, Math.PI, true);347 self.ctx.strokeStyle = hsla(+f.hue+, 100%, +f.brightness+\%, +rand(25, 60)/100+);348 self.ctx.lineWidth = f.lineWidth;349 self.ctx.stroke();350 self.ctx.restore();351}352 };353 };354 355 self.bindEvents = function(){356 $(window).on( esize, function(){357clearTimeout(self.timeout);358self.timeout = setTimeout(function() {359 self.canvas.width = self.cw = $(window).innerWidth();360 self.canvas.height = self.ch = $(window).innerHeight();361 self.ctx.lineCap = ound;362 self.ctx.lineJoin = ound;363}, 100);364 });365 366 $(self.canvas).on(mousedown, function(e){367self.mx = e.pageX - self.canvas.offsetLeft;368self.my = e.pageY - self.canvas.offsetTop;369self.currentHue = rand(self.hueMin, self.hueMax);370self.createFireworks(self.cw/2, self.ch, self.mx, self.my);371 372$(self.canvas).on(mousemove.fireworks, function(e){373 self.mx = e.pageX - self.canvas.offsetLeft;374 self.my = e.pageY - self.canvas.offsetTop;375 self.currentHue = rand(self.hueMin, self.hueMax);376 self.createFireworks(self.cw/2, self.ch, self.mx, self.my);377});378 });379 380 $(self.canvas).on(mouseup, function(e){381$(self.canvas).off(mousemove.fireworks);382 });383 384 }385 386 self.clear = function(){387 self.particles = [];388 self.fireworks = [];389 self.ctx.clearRect(0, 0, self.cw, self.ch);390 };391 392 393 self.canvasLoop = function(){394 requestAnimFrame(self.canvasLoop, self.canvas);395 self.ctx.globalCompositeOperation = destination-out;396 self.ctx.fillStyle = gba(0,0,0,+self.clearAlpha/100+);397 self.ctx.fillRect(0,0,self.cw,self.ch);398 self.updateFireworks();399 self.updateParticles();400 self.drawFireworks();401 self.drawParticles();402 403 };404 405 self.init();406 407 }408 var fworks = new Fireworks();409 410});411 412 413 414 415
广大网友们!因为这是放假的时候老师给发的!所以我也看不太懂有些东西!实在是抱歉 有什么不明白的,就留言告诉我!我去找我曾经的老师问问,虽然他已经退休好久了!!
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