网站制作（道歉）-编程知识

王心怡* , 张钊*

(淮北师范大学计算机科学与技术学院，安徽淮北)

*These authors contributed to the work equllly and should be regarded as co-first authors.

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可以点击这个网址查看效果：

第一张：

第二张：

第三张：

第四张：

<div class="wrapper"><input type="checkbox" id="ck1"/><label for="ck1">I</label><input type="checkbox" id="ck2"/><label for="ck2">love</label><input type="checkbox" id="ck3"/><label for="ck3">you</label>
</div><style type="text/css">
html {display: table;width: 100%; height: 100%;table-layout: fixed;
}body {display: table-cell;width: 100%; height: 100%;vertical-align: middle;font-family: 'Shadows Into Light';color: #111;
}.wrapper {width: 500px; height: 500px;position: relative;margin: 0 auto;
}input[type="checkbox"] {display: none;
}input[type="checkbox"] + label {width: 100px; height: 100px;line-height: 100px;display: inline-block;position: absolute;text-align: center;font-size: 100px;transition: all 1s ease;
}label {text-shadow: 8px 8px 30px rgba(0,0,0,0.5);
}label:hover {color: #c32a2a;cursor: pointer;}#ck1 + label,
#ck2 + label {border-radius: 50px;top: 0;
}#ck1:checked + label,
#ck2:checked + label,
#ck3:checked + label {background: #c32a2a;font-size: 0;transition: all 1s ease;
}#ck1:checked + label,
#ck2:checked + label {width: 300px; height: 300px;border-radius: 150px;line-height: 300px;
}#ck1 + label {left: 0;
}#ck2 + label {right: 0;
}#ck3 + label {bottom: 0; left: 50%;margin: 0 -50px;
}#ck3:checked + label {width: 275px; height: 275px;bottom: 96px; left: 162px;transform: rotate(45deg);line-height: 27px;}span {display: inline-block;text-align: center;position: absolute;bottom: 10px; left: 50%;margin-left: -100px;width: 200px;font-size: 24px;color: #999;
}
</style><span>点击每个单词查看效果</span>

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var Point = (function() {function Point(x, y) {this.x = (typeof x !== 'undefined') ? x : 0;this.y = (typeof y !== 'undefined') ? y : 0;}Point.prototype.clone = function() {return new Point(this.x, this.y);};Point.prototype.length = function(length) {if (typeof length == 'undefined')return Math.sqrt(this.x * this.x + this.y * this.y);this.normalize();this.x *= length;this.y *= length;return this;};Point.prototype.normalize = function() {var length = this.length();this.x /= length;this.y /= length;return this;};return Point;
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})();/** ParticlePool class*/
var ParticlePool = (function() {var particles,firstActive = 0,firstFree   = 0,duration    = settings.particles.duration;function ParticlePool(length) {// create and populate particle poolparticles = new Array(length);for (var i = 0; i < particles.length; i++)particles[i] = new Particle();}ParticlePool.prototype.add = function(x, y, dx, dy) {particles[firstFree].initialize(x, y, dx, dy);// handle circular queuefirstFree++;if (firstFree   == particles.length) firstFree   = 0;if (firstActive == firstFree       ) firstActive++;if (firstActive == particles.length) firstActive = 0;};ParticlePool.prototype.update = function(deltaTime) {var i;// update active particlesif (firstActive < firstFree) {for (i = firstActive; i < firstFree; i++)particles[i].update(deltaTime);}if (firstFree < firstActive) {for (i = firstActive; i < particles.length; i++)particles[i].update(deltaTime);for (i = 0; i < firstFree; i++)particles[i].update(deltaTime);}// remove inactive particleswhile (particles[firstActive].age >= duration && firstActive != firstFree) {firstActive++;if (firstActive == particles.length) firstActive = 0;}};ParticlePool.prototype.draw = function(context, image) {// draw active particlesif (firstActive < firstFree) {for (i = firstActive; i < firstFree; i++)particles[i].draw(context, image);}if (firstFree < firstActive) {for (i = firstActive; i < particles.length; i++)particles[i].draw(context, image);for (i = 0; i < firstFree; i++)particles[i].draw(context, image);}};return ParticlePool;
})();/** Putting it all together*/
(function(canvas) {var context = canvas.getContext('2d'),particles = new ParticlePool(settings.particles.length),particleRate = settings.particles.length / settings.particles.duration, // particles/sectime;// get point on heart with -PI <= t <= PIfunction pointOnHeart(t) {return new Point(160 * Math.pow(Math.sin(t), 3),130 * Math.cos(t) - 50 * Math.cos(2 * t) - 20 * Math.cos(3 * t) - 10 * Math.cos(4 * t) + 25);}// creating the particle image using a dummy canvasvar image = (function() {var canvas  = document.createElement('canvas'),context = canvas.getContext('2d');canvas.width  = settings.particles.size;canvas.height = settings.particles.size;// helper function to create the pathfunction to(t) {var point = pointOnHeart(t);point.x = settings.particles.size / 2 + point.x * settings.particles.size / 350;point.y = settings.particles.size / 2 - point.y * settings.particles.size / 350;return point;}// create the pathcontext.beginPath();var t = -Math.PI;var point = to(t);context.moveTo(point.x, point.y);while (t < Math.PI) {t += 0.01; // baby steps!point = to(t);context.lineTo(point.x, point.y);}context.closePath();// create the fillcontext.fillStyle = '#ea80b0';context.fill();// create the imagevar image = new Image();image.src = canvas.toDataURL();return image;})();// render that thing!function render() {// next animation framerequestAnimationFrame(render);// update timevar newTime   = new Date().getTime() / 1000,deltaTime = newTime - (time || newTime);time = newTime;// clear canvascontext.clearRect(0, 0, canvas.width, canvas.height);// create new particlesvar amount = particleRate * deltaTime;for (var i = 0; i < amount; i++) {var pos = pointOnHeart(Math.PI - 2 * Math.PI * Math.random());var dir = pos.clone().length(settings.particles.velocity);particles.add(canvas.width / 2 + pos.x, canvas.height / 2 - pos.y, dir.x, -dir.y);}// update and draw particlesparticles.update(deltaTime);particles.draw(context, image);}// handle (re-)sizing of the canvasfunction onResize() {canvas.width  = canvas.clientWidth;canvas.height = canvas.clientHeight;}window.onresize = onResize;// delay rendering bootstrapsetTimeout(function() {onResize();render();}, 10);
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Institutional Review Board Statement: Not applicable.

Informed Consent Statement: Not applicable.

Data Availability Statement: Not applicable.

Author Contributions:All authors participated in the assisting performance study and approved the paper.

Conflicts of Interest: The authors declare no conflict of interest