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This article mainly introduces "how to achieve fireworks special effects with sound effects in JavaScript". In daily operation, I believe many people have doubts about how to achieve fireworks special effects with sound effects in JavaScript. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubts about "how to achieve fireworks special effects with sound effects in JavaScript". Next, please follow the editor to study!

The JavaScript code is as follows:

$(function () {var canvas = $('# canvas') [0]; canvas.width = $(window). Width (); canvas.height = $(window). Height (); var ctx = canvas.getContext ('2d'); / / resize $_ (window) .on (' resize', function () {canvas.width = $(window) .width () Canvas.height = $(window). Height (); ctx.fillStyle ='# 000003; ctx.fillRect (0,0, canvas.width, canvas.height); center = {x: canvas.width / 2, y: canvas.height / 2};}); / / init ctx.fillStyle ='# 000003' Ctx.fillRect (0,0, canvas.width, canvas.height); / / objects var listFire = []; var listFirework = []; var listText = []; var listSpecial = []; var listSpark = []; var lights = []; var fireNumber = 10; var center = {x: canvas.width / 2, y: canvas.height / 2}; var range = 100 Var fired = 0; var onHold = 0; var supprise = false; var textIndex = 0; var actions = [makeDoubleFullCircleFirework, makePlanetCircleFirework, makeFullCircleFirework, makeDoubleCircleFirework, makeHeartFirework, makeCircleFirework, makeRandomFirework]; for (var I = 0; I

< fireNumber; i++) { var fire = { x: Math.random() * range / 2 - range / 4 + center.x, y: Math.random() * range * 2.5 + canvas.height, size: Math.random() + 0.5, fill: '#ff3', vx: Math.random() - 0.5, vy: -(Math.random() + 4), ax: Math.random() * 0.06 - 0.03, delay: Math.round(Math.random() * range) + range * 4, hold: false, alpha: 1, far: Math.random() * range + (center.y - range) }; fire.base = { x: fire.x, y: fire.y, vx: fire.vx, vy: fire.vy }; // listFire.push(fire); // play sound playLaunchSound(); } // define array of sound var listExpSound = $('audio.exp'); var listLaunchSound = $('audio.launch'); // define array position of text var textString = 'happylunarnewyear2018'; var textMatrix = [ 4.5, 0, 5.5, 0, 6.5, 0, 7.5, 0, 8.5, 0, 0, 1, 1, 1, 2, 1, 3, 1, 4, 1, 6, 1, 7, 1, 8, 1, 10, 1, 11, 1, 12, 1, 13, 1, 5, 2, 6, 2, 7, 2, 8, 2 ] var chars = { h: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 1, 3, 2, 3, 3, 3, 4, 3, 5, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 5, 6, 5, 7 ], a: [ 2, 0, 2, 1, 2, 2, 1, 2, 1, 3, 1, 4, 1, 5, 0, 5, 0, 6, 0, 7, 2, 5, 3, 0, 3, 1, 3, 2, 4, 2, 4, 3, 4, 4, 4, 1, 5, 5, 5, 6, 5, 7, 3, 5 ], p: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 1, 0, 2, 0, 3, 0, 4, 1, 5, 2, 4, 3, 3, 4, 2, 4, 1, 4 ], y: [ 0, 0, 0, 1, 1, 1, 1, 2, 1, 3, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 3, 2, 3, 3, 4, 1, 4, 2, 5, 0, 5, 1 ], l: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 1, 7, 2, 7, 3, 7, 4, 7, 5, 7 ], u: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 1, 7, 2, 7, 3, 7, 4, 7, 5, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 5, 6 ], n: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 1, 1, 1, 2, 2, 2, 2, 3, 2, 4, 3, 4, 3, 5, 4, 5, 4, 6, 5, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 5, 6, 5, 7 ], e: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 1, 3, 2, 3, 3, 3, 4, 3, 1, 7, 2, 7, 3, 7, 4, 7, 5, 7 ], w: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 1, 6, 2, 1, 2, 2, 2, 3, 2, 4, 2, 5, 2, 6, 2, 7, 3, 7, 5, 0, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 4, 5, 4, 6 ], r: [ 0, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 0, 7, 1, 0, 2, 0, 3, 0, 4, 1, 5, 2, 4, 3, 3, 4, 2, 4, 1, 4, 1, 5, 2, 5, 3, 6, 4, 6, 5, 7 ], 2: [ 0, 1, 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 5, 1, 5, 2, 5, 3, 4, 3, 3, 3, 2, 3, 2, 4, 1, 4, 1, 5, 0, 5, 0, 6, 0, 7, 1, 7, 2, 7, 3, 7, 4, 7, 5, 7, 5, 6 ], 0: [ 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 6, 1, 0, 2, 0, 3, 0, 4, 0, 1, 7, 2, 7, 3, 7, 4, 7, 5, 1, 5, 2, 5, 3, 5, 4, 5, 5, 5, 6 ], 1: [ 1, 2, 2, 2, 2, 1, 3, 1, 3, 0, 4, 0, 4, 1, 4, 2, 4, 3, 4, 4, 4, 5, 4, 6, 4, 7, 1, 7, 2, 7, 3, 7, 5, 7 ], 7: [ 0, 0, 1, 0, 2, 0, 3, 0, 4, 0, 5, 0, 5, 1, 5, 2, 5, 3, 4, 3, 4, 4, 3, 4, 3, 5, 3, 6, 3, 7 ] } function initText() { var i = textIndex; var velocity = Math.random() * 0.25 + 1; var shift = { x: -(Math.random() + 2), y: -(Math.random() + 3) }; var char = chars[textString[i]]; var width = 80; var half = 6.5 * width; var left = textMatrix[i * 2] * width - half; var top = textMatrix[i * 2 + 1] * range * 1.2 - range * 2.4; for (var j = 0; j < fireNumber * char.length * 0.25; j++) { var rand = Math.floor(Math.random() * char.length * 0.5); var x = char[rand * 2] + shift.x; var y = char[rand * 2 + 1] + shift.y; var text = { x: center.x + left * 0.9, y: center.y + top, left: center.x + left, size: Math.random() + 0.5, fill: '#ff3', vx: x * (velocity + (Math.random() - 0.5) * 0.5), vy: y * (velocity + (Math.random() - 0.5) * 0.5), ay: 0.08, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 } text.base = { life: text.life, size: text.size, }; text.direct = (text.left - text.x) * 0.08; listText.push(text); } // play sound playExpSound(); // lights.push({ x: center.x + left * 0.9, y: center.y + top, color: text.fill, radius: range * 2 }); if (++textIndex < textString.length) { setTimeout(initText, 10); } else { textIndex = 0; } } function initSpark() { var x = Math.random() * range * 3 - range * 1.5 + center.x; var vx = Math.random() - 0.5; var vy = -(Math.random() + 4); var ax = Math.random() * 0.04 - 0.02; var far = Math.random() * range * 4 - range + center.y; var direct = ax * 10 * Math.PI; var max = fireNumber * 0.5; for (var i = 0; i < max; i++) { var special = { x: x, y: Math.random() * range * 0.25 + canvas.height, size: Math.random() + 2, fill: '#ff3', vx: vx, vy: vy, ax: ax, direct: direct, alpha: 1 }; special.far = far - (special.y - canvas.height); listSpecial.push(special); // play sound playLaunchSound(); } } function randColor() { var r = Math.floor(Math.random() * 256); var g = Math.floor(Math.random() * 256); var b = Math.floor(Math.random() * 256); var color = 'rgb($r, $g, $b)'; color = color.replace('$r', r); color = color.replace('$g', g); color = color.replace('$b', b); return color; } function playExpSound() { var sound = listExpSound[Math.floor(Math.random() * listExpSound.length)]; sound.volume = Math.random() * 0.4 + 0.1; sound.play(); } function playLaunchSound() { setTimeout(function() { var sound = listLaunchSound[Math.floor(Math.random() * listLaunchSound.length)]; sound.volume = 0.05; sound.play(); }, 200); } function makeCircleFirework(fire) { var color = randColor(); var velocity = Math.random() * 2 + 6; var max = fireNumber * 5; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.04, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 2 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return color; } function makeDoubleCircleFirework(fire) { var color = randColor(); var velocity = Math.random() * 2 + 8; var max = fireNumber * 3; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.04, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } color = randColor(); velocity = Math.random() * 3 + 4; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.04, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return color; } function makePlanetCircleFirework(fire) { var color = '#aa0609'; var velocity = Math.random() * 2 + 4; var max = fireNumber * 2; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.04, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } max = fireNumber * 4; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity * Math.random(), vy: Math.sin(rad) * velocity * Math.random(), ay: 0.04, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } max = fireNumber * 3; color = '#ff9'; var rotate = Math.random() * Math.PI * 2; var vx = velocity * (Math.random() + 2); var vy = velocity * 0.6; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; // calc x, y for ellipse var cx = Math.cos(rad) * vx + (Math.random() - 0.5) * 0.5; var cy = Math.sin(rad) * vy + (Math.random() - 0.5) * 0.5; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: cx * Math.cos(rotate) - cy * Math.sin(rotate), // rotate x ellipse vy: cx * Math.sin(rotate) + cy * Math.cos(rotate), // rotate y ellipse ay: 0.02, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return '#aa0609'; } function makeFullCircleFirework(fire) { var color = randColor(); var velocity = Math.random() * 8 + 8; var max = fireNumber * 3; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.06, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } max = fireNumber * Math.round(Math.random() * 4 + 4); for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity * Math.random(), vy: Math.sin(rad) * velocity * Math.random(), ay: 0.06, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return color; } function makeDoubleFullCircleFirework(fire) { var color = randColor(); var velocity = Math.random() * 8 + 8; var max = fireNumber * 3; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.04, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } color = randColor(); velocity = Math.random() * 3 + 4; max = fireNumber * 2; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.06, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } max = fireNumber * 4; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * velocity * Math.random(), vy: Math.sin(rad) * velocity * Math.random(), ay: 0.06, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return color; } function makeHeartFirework(fire) { var color = randColor(); var velocity = Math.random() * 3 + 3; var max = fireNumber * 5; var rotate = Math.random() * Math.PI * 2; for (var i = 0; i < max; i++) { var rad = (i * Math.PI * 2) / max + rotate; var v, p; if (rad - rotate < Math.PI * 0.5) { p = (rad - rotate) / (Math.PI * 0.5); v = velocity + velocity * p; } else if (rad - rotate >

Math.PI * 0.5 & & rad-rotate

< Math.PI) { p = (rad - rotate - Math.PI * 0.5) / (Math.PI * 0.5); v = velocity * (2 - p); } else if (rad - rotate >

Math.PI & & rad-rotate

< Math.PI * 1.5) { p = (rad - rotate - Math.PI) / (Math.PI * 0.5); v = velocity * (1 - p); } else if (rad - rotate >

Math.PI * 1.5 & & rad-rotate

< Math.PI * 2) { p = (rad - rotate - Math.PI * 1.5) / (Math.PI * 0.5); v = velocity * p; } else { v = velocity; } v = v + (Math.random() - 0.5) * 0.25; var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.cos(rad) * v, vy: Math.sin(rad) * v, ay: 0.02, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 1.5 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return color; } function makeRandomFirework(fire) { var color = randColor(); for (var i = 0; i < fireNumber * 5; i++) { var firework = { x: fire.x, y: fire.y, size: Math.random() + 1.5, fill: color, vx: Math.random() * 15 - 7.5, vy: Math.random() * -15 + 5, ay: 0.05, alpha: 1, life: Math.round(Math.random() * range / 2) + range / 2 }; firework.base = { life: firework.life, size: firework.size }; listFirework.push(firework); } return color; } function makeSpark(special) { var color = special.fill; var velocity = Math.random() * 6 + 12; var max = fireNumber; for (var i = 0; i < max; i++) { var rad = (Math.random() * Math.PI * 0.3 + Math.PI * 0.35) + Math.PI + special.direct; var spark = { x: special.x, y: special.y, size: Math.random() + 1, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.02, alpha: 1, rad: rad, direct: special.direct, chain: Math.round(Math.random() * 2) + 2, life: Math.round(Math.random() * range / 2) + range / 2 }; spark.base = { life: spark.life, velocity: velocity }; listSpark.push(spark); } return color; } function chainSpark(parentSpark) { var color = parentSpark.fill; if (parentSpark.chain >

0) {var velocity = parentSpark.base.velocity * 0.6; var max = Math.round (Math.random () * 5); for (var I = 0; I

< max; i++) { var rad = (Math.random() * Math.PI * 0.3 - Math.PI * 0.15) + parentSpark.rad + parentSpark.direct; var spark = { x: parentSpark.x, y: parentSpark.y, size: parentSpark.size * 0.6, fill: color, vx: Math.cos(rad) * velocity + (Math.random() - 0.5) * 0.5, vy: Math.sin(rad) * velocity + (Math.random() - 0.5) * 0.5, ay: 0.02, alpha: 1, rad: rad, direct: parentSpark.direct, chain: parentSpark.chain, life: parentSpark.base.life * 0.8 }; spark.base = { life: spark.life, size: spark.size, velocity: velocity }; listSpark.push(spark); } if (Math.random() >

{/ / play sound playExpSound ();}} return color;} (function loop () {requestAnimationFrame (loop); update ()) Draw ();}) (); function update () {/ / update fire logic for (var I = 0; I)

< listFire.length; i++) { var fire = listFire[i]; // if (fire.y = 0; i--) { var firework = listFirework[i]; if (firework) { firework.vx *= 0.9; firework.vy *= 0.9; firework.x += firework.vx; firework.y += firework.vy; firework.vy += firework.ay; firework.alpha = firework.life / firework.base.life; firework.size = firework.alpha * firework.base.size; firework.alpha = firework.alpha >

0. 6? 1: firework.alpha; / / firework.life--; if (firework.life = 0; iMurray -) {var text = listText [I]; text.vx * = 0.9 Text.vy * = 0.9; text.direct * = 0.9; text.x + = text.vx + text.direct; text.y + = text.vy; text.vy + = text.ay; text.alpha = text.life / text.base.life Text.size = text.alpha * text.base.size; text.alpha = text.alpha > 0.61: text.alpha; / / text.life--; if (text.life = 0 Var special -) {var special = listSpecial [I]; if (special.y = 0; iMel -) {var spark = listSpark [I]; if (spark) {spark.vx * = 0.9 Spark.vy * = 0.9; spark.x + = spark.vx; spark.y + = spark.vy; spark.vy + = spark.ay; spark.alpha = spark.life / spark.base.life + 0.2 / / spark.life--; if (spark.life

< spark.base.life * 0.8 && spark.life >

0) {/ / spark.chain--; chainSpark (spark);} if (spark.life

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