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------->视觉体验
【源代码分享】
<!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title>HTML5文本输入框粒子动画特效DEMO演示</title> <style> input { border: 2px solid #5E6C77; font-size: 1.5em; padding: .25em .5em .3125em; color: #5E6C77; border-radius: .25em; background: transparent; -webkit-transition: all .100s; transition: all .100s; margin:80px auto; } input:focus { outline: none; color: #A2ACB3; border-color: #A2ACB3; } input.keyup { color: white; border-color: white; text-shadow: 0 0 .125em white; box-shadow: 0 0 .25em white,inset 0 0 .25em white; } body { -webkit-box-align: center; -webkit-align-items: center; -ms-flex-align: center; align-items: center; -webkit-box-pack: center; -webkit-justify-content: center; -ms-flex-pack: center; justify-content: center; } canvas { position: absolute; left: 0; right: 0; top: 0; bottom: 0; pointer-events: none; } input { font-family: "Arial Rounded MT Bold","Helvetica Rounded",Arial,sans-serif; } ::-webkit-input-placeholder { color: #5E6C77; text-shadow: 0 0 .125em transparent; -webkit-transition: all .25s; transition: all .25s; } input:focus::-webkit-input-placeholder { opacity: .5; } ::-moz-placeholder { color: #5E6C77; text-shadow: 0 0 .125em transparent; -webkit-transition: all .25s; transition: all .25s; } input:focus::-moz-placeholder { opacity: .5; } :-ms-input-placeholder { color: #5E6C77; text-shadow: 0 0 .125em transparent; -webkit-transition: all .25s; transition: all .25s; } input:focus:-ms-input-placeholder { opacity: .5; } html, body { height: 100%; overflow: hidden; } html { background: #282E33; } </style> </head> <body> <input type="text" placeholder="请输入关键词"> <div style="text-align:center;clear:both;"> <script type="text/javascript"> console.clear(); //www.codesc.net var MAX_LIFE = 50; var canvas = document.querySelector('canvas'); var input = document.querySelector('input'); var field = {} var hasFocus = false; var caret = document.createElement('span'); caret.style.cssText = document.defaultView.getComputedStyle(input, '').cssText; caret.style.position = 'absolute'; caret.style.left = 0; caret.style.top = 0; caret.style.width = 'auto'; caret.style.visibility = 'hidden'; document.body.appendChild(caret); function reposition() { field = input.getBoundingClientRect(); } window.onload = reposition; window.onresize = reposition; reposition(); input.onfocus = function() { hasFocus = true } input.onblur = function() { hasFocus = false } function rain() { } function burst(intensity) { var behavior = [ this.behavior.cohesion(), this.behavior.move() ]; var size = .75; `` var force = .7; var lifeMin = 0; var progress = Math.min(field.width, caret.offsetWidth) / field.width; var offset = field.left + (field.width * progress); var rangeMin = Math.max(field.left, offset - 30); var rangeMax = Math.min(field.right, offset + 10); this.spray(intensity, function() { return [ null, null, Vector.create( Random.between(rangeMin + 10, rangeMax - 20), Random.between(field.top + 15, field.bottom - 15) ), Vector.random(force), size + Math.random(), Random.between(lifeMin, 0), behavior ] }); // top edge this.spray(intensity * .5, function() { return [ null, null, Vector.create( Random.between(rangeMin, rangeMax), field.top ), Vector.random(force), size + Math.random(), Random.between(lifeMin, 0), behavior ] }); // bottom edge this.spray(intensity * .5, function() { return [ null, null, Vector.create( Random.between(rangeMin, rangeMax), field.top + field.height ), Vector.random(force), size + Math.random(), Random.between(lifeMin, 0), behavior ] }); // left edge if (input.value.length === 1) { this.spray(intensity * 2, function() { return [ null, null, Vector.create( field.left, Random.between(field.top, field.bottom) ), Vector.random(force), size + Math.random(), Random.between(lifeMin, 0), behavior ] }); } // right edge if (rangeMax == field.right) { this.spray(intensity * 2, function() { return [ null, null, Vector.create( field.right, Random.between(field.top, field.bottom) ), Vector.random(force), size + Math.random(), Random.between(lifeMin, 0), behavior ] }); } } // start particle simulation simulate( '2d', { init: function() { }, tick: function(particles) { if (!particles) { return; } particles.forEach(function(p) { if (p.life > MAX_LIFE) { this.destroy(p); } }); }, beforePaint: function() { this.clear(); }, paint: function(particle) { var p = particle.position; var s = particle.size; var o = 1 - (particle.life / MAX_LIFE); this.paint.circle(p.x, p.y, s, 'rgba(255,255,255,' + o + ')'); this.paint.circle(p.x, p.y, s + 2, 'rgba(231,244,255,' + (o * .25) + ')'); }, afterPaint: function() { // nothing }, action: function(x, y) { caret.textContent = input.value; burst.call(this, 10); input.classList.add('keyup'); setTimeout(function() { input.classList.remove('keyup') }, 100); } } ); // "simulate" particle simulation logic /** * Constants */ PI_2 = Math.PI / 2; PI_180 = Math.PI / 180; /** * Random */ var Random = { between: function(min, max) { return min + (Math.random() * (max - min)); } } /** * 2D Vector Class */ function Vector(x, y) { this._x = x || 0; this._y = y || 0; } Vector.create = function(x, y) { return new Vector(x, y); }; Vector.add = function(a, b) { return new Vector(a.x + b.x, a.y + b.y); }; Vector.subtract = function(a, b) { return new Vector(a.x - b.x, a.y - b.y); }; Vector.random = function(range) { var v = new Vector(); v.randomize(range); return v; }; Vector.distanceSquared = function(a, b) { var dx = a.x - b.x; var dy = a.y - b.y; return dx * dx + dy * dy; }; Vector.distance = function(a, b) { var dx = a.x - b.x; var dy = a.y - b.y; return Math.sqrt(dx * dx + dy * dy); }; Vector.prototype = { get x() { return this._x; }, get y() { return this._y; }, set x(value) { this._x = value; }, set y(value) { this._y = value; }, get magnitudeSquared() { return this._x * this._x + this._y * this._y; }, get magnitude() { return Math.sqrt(this.magnitudeSquared); }, get angle() { return Math.atan2(this._y, this._x) * 180 / Math.PI; }, clone: function() { return new Vector(this._x, this._y); }, add: function(v) { this._x += v.x; this._y += v.y; }, subtract: function(v) { this._x -= v.x; this._y -= v.y; }, multiply: function(value) { this._x *= value; this._y *= value; }, divide: function(value) { this._x /= value; this._y /= value; }, normalize: function() { var magnitude = this.magnitude; if (magnitude > 0) { this.divide(magnitude); } }, limit: function(treshold) { if (this.magnitude > treshold) { this.normalize(); this.multiply(treshold); } }, randomize: function(amount) { amount = amount || 1; this._x = amount * 2 * (-.5 + Math.random()); this._y = amount * 2 * (-.5 + Math.random()); }, rotate: function(degrees) { var magnitude = this.magnitude; var angle = ((Math.atan2(this._x, this._y) * PI_HALF) + degrees) * PI_180; this._x = magnitude * Math.cos(angle); this._y = magnitude * Math.sin(angle); }, flip: function() { var temp = this._y; this._y = this._x; this._x = temp; }, invert: function() { this._x = -this._x; this._y = -this._y; }, toString: function() { return this._x + ', ' + this._y; } } /** * Particle Class */ function Particle(id, group, position, velocity, size, life, behavior) { this._id = id || 'default'; this._group = group || 'default'; this._position = position || new Vector(); this._velocity = velocity || new Vector(); this._size = size || 1; this._life = Math.round(life || 0); this._behavior = behavior || []; } Particle.prototype = { get id() { return this._id; }, get group() { return this._group; }, get life() { return this._life; }, get size() { return this._size; }, set size(size) { this._size = size; }, get position() { return this._position; }, get velocity() { return this._velocity; }, update: function(stage) { this._life++; var i = 0; var l = this._behavior.length; for (; i < l; i++) { this._behavior[i].call(stage, this); } }, toString: function() { return 'Particle(' + this._id + ') ' + this._life + ' pos: ' + this._position + ' vec: ' + this._velocity; } } // setup DOM function simulate(dimensions, options) { // private vars var particles = []; var destroyed = []; var update = update || function() {}; var stage = stage || function() {}; var canvas; var context; if (!options) { console.error('"options" object must be defined'); return; } if (!options.init) { console.error('"init" function must be defined'); return; } if (!options.paint) { console.error('"paint" function must be defined'); return; } if (!options.tick) { options.tick = function() {}; } if (!options.beforePaint) { options.beforePaint = function() {}; } if (!options.afterPaint) { options.afterPaint = function() {}; } if (!options.action) { options.action = function() {}; } if (document.readyState === 'interactive') { setup(); } else { document.addEventListener('DOMContentLoaded', setup); } // resizes canvas to fit window dimensions function fitCanvas() { canvas.width = window.innerWidth; canvas.height = window.innerHeight; } // create canvas for drawing function setup() { // create canvas = document.createElement('canvas'); document.body.appendChild(canvas); // correct canvas size on window resize window.addEventListener('resize', fitCanvas); // go go(); } // canvas has been attached, let's go! function go() { // set initial canvas size fitCanvas(); // get context for drawing context = canvas.getContext(dimensions); // simulation update loop function act() { // update particle states var i = 0; var l = particles.length; var p; for (; i < l; i++) { particles[i].update(this); } // clean destroyed particles while (p = destroyed.pop()) { do { // has not been found in destroyed array? if (p !== particles[i]) { continue; } // remove particle particles.splice(i, 1); } while (i-- >= 0) } // repaint context options.beforePaint.call(this); // repaint particles i = 0; l = particles.length; for (; i < l; i++) { options.paint.call(this, particles[i]); } // after particles have been painted options.afterPaint.call(this); } function tick() { // call update method, this allows for inserting particles later on options.tick.call(this, particles); // update particles here act(); // on to the next frame window.requestAnimationFrame(tick); } /** * API **/ function clear() { context.clearRect(0, 0, canvas.width, canvas.height); } function destroy(particle) { destroyed.push(particle); } function add(id, group, position, velocity, size, life, behavior) { particles.push(new Particle(id, group, position, velocity, size, life, behavior)); } function spray(amount, config) { var i = 0; for (; i < amount; i++) { add.apply(this, config()); } } function debug(particle) { this.paint.circle( particle.position.x, particle.position.y, particle.size, 'rgba(255,0,0,.75)' ); context.beginPath(); context.moveTo(particle.position.x, particle.position.y); context.lineTo(particle.position.x + (particle.velocity.x * 10), particle.position.y + (particle.velocity.y * 10)); context.strokeStyle = 'rgba(255,0,0,.1)'; context.stroke(); context.closePath(); }; this.clear = clear; this.destroy = destroy; this.add = add; this.spray = spray; this.debug = debug; this.paint = { circle: function(x, y, size, color) { context.beginPath(); context.arc(x, y, size, 0, 2 * Math.PI, false); context.fillStyle = color; context.fill(); }, square: function(x, y, size, color) { context.beginPath(); context.rect(x - (size * .5), y - (size * .5), size, size); context.fillStyle = color; context.fill(); } } this.behavior = { cohesion: function(range, speed) { range = Math.pow(range || 100, 2); speed = speed || .001; return function(particle) { var center = new Vector(); var i = 0; var l = particles.length; var count = 0; if (l <= 1) { return; } for (; i < l; i++) { // don't use self in group if (particles[i] === particle || Vector.distanceSquared(particles[i].position, particle.position) > range) { continue; } center.add(Vector.subtract(particles[i].position, particle.position)); count++; } if (count > 0) { center.divide(count); center.normalize(); center.multiply(particle.velocity.magnitude); center.multiply(.05); } particle.velocity.add(center); } }, separation: function(distance) { var distance = Math.pow(distance || 25, 2); return function(particle) { var heading = new Vector(); var i = 0; var l = particles.length; var count = 0; var diff; if (l <= 1) { return; } for (; i < l; i++) { // don't use self in group if (particles[i] === particle || Vector.distanceSquared(particles[i].position, particle.position) > distance) { continue; } // stay away from neighbours diff = Vector.subtract(particle.position, particles[i].position); diff.normalize(); heading.add(diff); count++; } if (count > 0) { // get average heading.divide(count); // make same length as current velocity (so particle won't speed up) heading.normalize(); heading.multiply(particle.velocity.magnitude); // limit force to make particle movement smoother heading.limit(.1); } particle.velocity.add(heading); } }, alignment: function(range) { range = Math.pow(range || 100, 2); return function(particle) { var i = 0; var l = particles.length; var count = 0; var heading = new Vector(); if (l <= 1) { return; } for (; i < l; i++) { // don't use self in group also don't align when out of range if (particles[i] === particle || Vector.distanceSquared(particles[i].position, particle.position) > range) { continue; } heading.add(particles[i].velocity); count++; } if (count > 0) { heading.divide(count); heading.normalize(); heading.multiply(particle.velocity.magnitude); // limit heading.multiply(.1); } particle.velocity.add(heading); } }, move: function() { return function(particle) { particle.position.add(particle.velocity); // handle collisions? } }, eat: function(food) { food = food || []; return function(particle) { var i = 0; var l = particles.length; var prey; for (; i < l; i++) { prey = particles[i]; // can't eat itself, also, needs to be tasty if (prey === particle || food.indexOf(prey.group) === -1) { continue; } // calculate force vector if (Vector.distanceSquared(particle.position, neighbour.position) < 2 && particle.size >= neighbour.size) { particle.size += neighbour.size; destroy(neighbour); } } } }, force: function(x, y) { return function(particle) { particle.velocity.x += x; particle.velocity.y += y; } }, limit: function(treshold) { return function(particle) { particle.velocity.limit(treshold); } }, attract: function(forceMultiplier, groups) { forceMultiplier = forceMultiplier || 1; groups = groups || []; return function(particle) { // attract other particles var totalForce = new Vector(0, 0); var force = new Vector(0, 0); var i = 0; var l = particles.length; var distance; var pull; var attractor; var grouping = groups.length; for (; i < l; i++) { attractor = particles[i]; // can't be attracted by itself or mismatched groups if (attractor === particle || (grouping && groups.indexOf(attractor.group) === -1)) { continue; } // calculate force vector force.x = attractor.position.x - particle.position.x; force.y = attractor.position.y - particle.position.y; distance = force.magnitude; force.normalize(); // the bigger the attractor the more force force.multiply(attractor.size / distance); totalForce.add(force); } totalForce.multiply(forceMultiplier); particle.velocity.add(totalForce); } }, wrap: function(margin) { return function(particle) { // move around when particle reaches edge of screen var position = particle.position; var radius = particle.size * .5; if (position.x + radius > canvas.width + margin) { position.x = radius; } if (position.y + radius > canvas.height + margin) { position.y = radius; } if (position.x - radius < -margin) { position.x = canvas.width - radius; } if (position.y - radius < -margin) { position.y = canvas.height - radius; } } }, reflect: function() { return function(particle) { // bounce from edges var position = particle.position; var velocity = particle.velocity; var radius = particle.size * .5; if (position.x + radius > canvas.width) { velocity.x = -velocity.x; } if (position.y + radius > canvas.height) { velocity.y = -velocity.y; } if (position.x - radius < 0) { velocity.x = -velocity.x; } if (position.y - radius < 0) { velocity.y = -velocity.y; } } }, edge: function(action) { return function(particle) { var position = particle.position; var velocity = particle.velocity; var radius = particle.size * .5; if (position.x + radius > canvas.width) { action(particle); } if (position.y + radius > canvas.height) { action(particle); } if (position.x - radius < 0) { action(particle); } if (position.y - radius < 0) { action(particle); } } } } // public Object.defineProperties(this, { 'particles': { get: function() { return particles; } }, 'width': { get: function() { return canvas.width; } }, 'height': { get: function() { return canvas.height; } }, 'context': { get: function() { return context; } } }); options.init.call(this) tick(); var self = this; document.addEventListener('keyup', function(e) { options.action.call(self, e.pageX, e.pageY); }); } }; </script> </div> </body> </html>
--------------------------------------------------------------------------------------------------------------------------------感谢观看！期待您的下次光临！