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This article will introduce in detail for you "JavaScript how to achieve five different fireworks effects", the content steps are clear and detailed, the details are handled properly, and the editor will update different knowledge points every day. I hope this article "JavaScript how to achieve five different fireworks effects" can give you unexpected gains, please follow the editor's ideas slowly in depth, the specific content is as follows, to harvest new knowledge.

I. simple and atmospheric fireworks

Demo address: http://haiyong.site/fireworks1

HTML Code:

The HTML code here is very short.

CSS code

These are the only two paragraphs of css.

Body {background:black; overflow:hidden; margin:0;} canvas {background:#000;}

JS code

All the source code is here, just copy and paste

Window.addEventListener ("resize", resizeCanvas, false); window.addEventListener ("DOMContentLoaded", onLoad, false); window.requestAnimationFrame = window.requestAnimationFrame | | window.webkitRequestAnimationFrame | | window.mozRequestAnimationFrame | | window.oRequestAnimationFrame | | window.msRequestAnimationFrame | | function (callback) {window.setTimeout (callback, 1000 Universe 60);}; var canvas, ctx, w, h, particles = [], probability = 0.04, xPoint, yPoint; function onLoad () {canvas = document.getElementById ("canvas") Ctx = canvas.getContext ("2d"); resizeCanvas (); window.requestAnimationFrame (updateWorld);} function resizeCanvas () {if (!! canvas) {w = canvas.width = window.innerWidth; h = canvas.height = window.innerHeight;}} function updateWorld () {update (); paint (); window.requestAnimationFrame (updateWorld);} function update () {if (particles.length)

< 500 && Math.random() < probability) { createFirework(); } var alive = []; for (var i=0; i= screen.height || this.alpha = 0; i--){ maxOpacity = Math.max(maxOpacity, this.fireworks[i].getOpacity()); } contextTwigs.clearRect(0, 0, this.width, this.height); contextFireworks.fillStyle = this.SKY_COLOR.replace('%luminance', 5 + maxOpacity * 15); contextFireworks.fillRect(0, 0, this.width, this.height); for(var i = this.fireworks.length - 1; i >

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