HTML5 progress bar special effects_html5 tutorial skills

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Copy code The code is as follows: HTML5有特色的进度条 body { background: #111; color:White; } a{color:White;} canvas { background: #111; border: 1px solid #171717; display: block; left: 50%; margin: -51px 0 0 -201px; position: absolute; top: 50%; } /*==============================================*/ /* Light Loader /*==================================================*/ var lightLoader = function (c, cw, ch) { var _this = this; this.c = c; this.ctx = c.getContext('2d'); this.cw = cw; this.ch = ch; this.loaded = 0; this.loaderSpeed = .6; this.loaderHeight = 10; this.loaderWidth = 310; this.loader = { x: (this.cw / 2) - (this.loaderWidth / 2), y: (this.ch / 2) - (this.loaderHeight / 2) }; this.particles = []; this.particleLift = 180; this.hueStart = 0 this.hueEnd = 120; this.hue = 0; this.gravity = .15; this.particleRate = 4; /*========================================================*/ /* Initialize /*========================================================*/ this.init = function () { this.loop(); }; /*========================================================*/ /* Utility Functions /*========================================================*/ this.rand = function (rMi, rMa) { return ~ ~((Math.random() * (rMa - rMi 1)) rMi); }; this.hitTest = function (x1, y1, w1, h1, x2, y2, w2, h2) { return !(x1 w1 /*========================================================*/ /* Update Loader /*========================================================*/ this.updateLoader = function () { if (this.loaded this.loaded = this.loaderSpeed; } else { this.loaded = 0; } }; /*========================================================*/ /* Render Loader /*========================================================*/ this.renderLoader = function () { this.ctx.fillStyle = '#000'; this.ctx.fillRect(this.loader.x, this.loader.y, this.loaderWidth, this.loaderHeight); this.hue = this.hueStart (this.loaded / 100) * (this.hueEnd - this.hueStart); var newWidth = (this.loaded / 100) * this.loaderWidth; this.ctx.fillStyle = 'hsla(' this.hue ', 100%, 40%, 1)'; this.ctx.fillRect(this.loader.x, this.loader.y, newWidth, this.loaderHeight); this.ctx.fillStyle = '#222'; this.ctx.fillRect(this.loader.x, this.loader.y, newWidth, this.loaderHeight / 2); }; /*========================================================*/ /* Particles /*========================================================*/ this.Particle = function () { this.x = _this.loader.x ((_this.loaded / 100) * _this.loaderWidth) - _this.rand(0, 1); this.y = _this.ch / 2 _this.rand(0, _this.loaderHeight) - _this.loaderHeight / 2; this.vx = (_this.rand(0, 4) - 2) / 100; this.vy = (_this.rand(0, _this.particleLift) - _this.particleLift * 2) / 100; this.width = _this.rand(1, 4) / 2; this.height = _this.rand(1, 4) / 2; this.hue = _this.hue; }; this.Particle.prototype.update = function (i) { this.vx = (_this.rand(0, 6) - 3) / 100; this.vy = _this.gravity; this.x = this.vx; this.y = this.vy; if (this.y > _this.ch) { _this.particles.splice(i, 1); } }; this.Particle.prototype.render = function () { _this.ctx.fillStyle = 'hsla(' this.hue ', 100%, ' _this.rand(50, 70) '%, ' _this.rand(20, 100) / 100 ')'; _this.ctx.fillRect(this.x, this.y, this.width, this.height); }; this.createParticles = function () { var i = this.particleRate; while (i--) { this.particles.push(new this.Particle()); }; }; this.updateParticles = function () { var i = this.particles.length; while (i--) { var p = this.particles[i]; p.update(i); }; }; this.renderParticles = function () { var i = this.particles.length; while (i--) { var p = this.particles[i]; p.render(); }; };

/*========================================================*/ /* Clear Canvas /*========================================================*/ this.clearCanvas = function () { this.ctx.globalCompositeOperation = 'source-over'; this.ctx.clearRect(0, 0, this.cw, this.ch); this.ctx.globalCompositeOperation = 'lighter'; }; /*========================================================*/ /* Animation Loop /*========================================================*/ this.loop = function () { var loopIt = function () { requestAnimationFrame(loopIt, _this.c); _this.clearCanvas(); _this.createParticles(); _this.updateLoader(); _this.updateParticles(); _this.renderLoader(); _this.renderParticles(); }; loopIt(); }; }; /*========================================================*/ /* Check Canvas Support /*========================================================*/ var isCanvasSupported = function () { var elem = document.createElement('canvas'); return !!(elem.getContext && elem.getContext('2d')); }; /*========================================================*/ /* Setup requestAnimationFrame /*========================================================*/ var setupRAF = function () { var lastTime = 0; var vendors = ['ms', 'moz', 'webkit', 'o']; for (var x = 0; x window.requestAnimationFrame = window[vendors[x] 'RequestAnimationFrame']; window.cancelAnimationFrame = window[vendors[x] 'CancelAnimationFrame'] || window[vendors[x] 'CancelRequestAnimationFrame']; }; if (!window.requestAnimationFrame) { window.requestAnimationFrame = function (callback, element) { var currTime = new Date().getTime(); var timeToCall = Math.max(0, 16 - (currTime - lastTime)); var id = window.setTimeout(function () { callback(currTime timeToCall); }, timeToCall); lastTime = currTime timeToCall; return id; }; }; if (!window.cancelAnimationFrame) { window.cancelAnimationFrame = function (id) { clearTimeout(id); }; }; }; /*========================================================*/ /* Define Canvas and Initialize /*========================================================*/ if (isCanvasSupported) { var c = document.createElement('canvas'); c.width = 400; c.height = 100; var cw = c.width; var ch = c.height; document.body.appendChild(c); var cl = new lightLoader(c, cw, ch); setupRAF(); cl.init(); } HTML5进度条 请使用支持HTML5的浏览器查看本页

HTML5 progress bar special effects_html5 tutorial skills

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