jquery制作 随机弹跳的小球特效

以下是源码：

代码如下:

<!doctype html>
 <html>
 <head>
 <title>HTML5 随机弹跳的小球</title>
 <style>
 body{
 font-family: 微软雅黑;   
 }
 body,h1{
 margin:0;
 }
 canvas{
 display:block;margin-left: auto;margin-right: auto;
 border:1px solid #DDD;   
 background: -webkit-linear-gradient(top, #222,#111);
 }   
 </style>
 </head>
 <body>
 <h1>HTML5特效 随机弹跳的小球</h1>
 <div>请使用支持HTML5的浏览器开打本页。 <button id="stop-keleyi-com">暂停</button>
 <button id="run-keleyi-com">继续</button>
 <button id="addBall-keleyi-com">增加小球</button> <button onclick="javascript:window.location.reload();">刷新</button>
 <br />每次刷新页面的小球大小，颜色，运动路线，都是新的，可以点击上面各个按钮看看效果。
 </div>
 <canvas id="canvas-keleyi-com" >
 </canvas>
 <script type="text/javascript" src="http://keleyi.com/keleyi/pmedia/jquery/jquery-1.11.0.min.js"></script>
 <script type="text/javascript">
 var nimo = {
 aniamted: null,
 content: null,
 data: {
 radiusRange: [5, 20],
 speedRange: [-5, 5],
 scrollHeight: null,
 scrollWdith: null
 },
 balls: [],
 ele: {
 canvas: null
 },
 fn: {
 creatRandom: function (startInt, endInt) {//生产随机数
 var iResult;
 iResult = startInt + (Math.floor(Math.random() * (endInt - startInt + 1)));
 return iResult
 },
 init: function () {
 nimo.data.scrollWdith = document.body.scrollWidth;
 nimo.data.scrollHeight = document.body.scrollHeight;
 nimo.ele.canvas = document.getElementById('canvas-ke'+'leyi-com');
 nimo.content = nimo.ele.canvas.getContext('2d');
 nimo.ele.canvas.width = nimo.data.scrollWdith - 50;
 nimo.ele.canvas.height = nimo.data.scrollHeight - 100;
 },
 addBall: function () {
 var aRandomColor = [];
 aRandomColor.push(nimo.fn.creatRandom(0, 255));
 aRandomColor.push(nimo.fn.creatRandom(0, 255));
 aRandomColor.push(nimo.fn.creatRandom(0, 255));
 var iRandomRadius = nimo.fn.creatRandom(nimo.data.radiusRange[0], nimo.data.radiusRange[1]);
 var oTempBall = {
 coordsX: nimo.fn.creatRandom(iRandomRadius, nimo.ele.canvas.width - iRandomRadius),
 coordsY: nimo.fn.creatRandom(iRandomRadius, nimo.ele.canvas.height - iRandomRadius),
 radius: iRandomRadius,
 bgColor: 'rgba(' + aRandomColor[0] + ',' + aRandomColor[1] + ',' + aRandomColor[2] + ',0.5)'
 };
 oTempBall.speedX = nimo.fn.creatRandom(nimo.data.speedRange[0], nimo.data.speedRange[1]);
 if (oTempBall.speedX === 0) {
 oTempBall.speedX = 1
 }
 if (oTempBall.speedY === 0) {
 oTempBall.speedY = 1
 }
 oTempBall.speedY = nimo.fn.creatRandom(nimo.data.speedRange[0], nimo.data.speedRange[1]);
 nimo.balls.push(oTempBall)
 },
 drawBall: function (bStatic) {
 var i, iSize;
 nimo.content.clearRect(0, 0, nimo.ele.canvas.width, nimo.ele.canvas.height)
 for (var i = 0, iSize = nimo.balls.length; i < iSize; i++) {
 var oTarger = nimo.balls[i];
 nimo.content.beginPath();
 nimo.content.arc(oTarger.coordsX, oTarger.coordsY, oTarger.radius, 0, 10);
 nimo.content.fillStyle = oTarger.bgColor;
 nimo.content.fill();
 if (!bStatic) {
 if (oTarger.coordsX + oTarger.radius >= nimo.ele.canvas.width) {
 oTarger.speedX = -(Math.abs(oTarger.speedX))
 }
 if (oTarger.coordsX - oTarger.radius <= 0) {
 oTarger.speedX = Math.abs(oTarger.speedX)
 }
 if (oTarger.coordsY - oTarger.radius <= 0) {
 oTarger.speedY = Math.abs(oTarger.speedY)
 }
 if (oTarger.coordsY + oTarger.radius >= nimo.ele.canvas.height) {
 oTarger.speedY = -(Math.abs(oTarger.speedY))
 }
 oTarger.coordsX = oTarger.coordsX + oTarger.speedX;
 oTarger.coordsY = oTarger.coordsY + oTarger.speedY;
 }
 }
 },
 run: function () {
 nimo.fn.drawBall();
 nimo.aniamted = setTimeout(function () {
 nimo.fn.drawBall();
 nimo.aniamted = setTimeout(arguments.callee, 10)
 }, 10)
 },
 stop: function () {
 clearTimeout(nimo.aniamted)
 }
 }
 }
 window.onload = function () {
 nimo.fn.init();
 var i;
 for (var i = 0; i < 10; i++) {
 nimo.fn.addBall();
 }
 nimo.fn.run();
 document.getElementById('stop-kel'+'eyi-com').onclick = function () {
 nimo.fn.stop()
 }
 document.getElementById('run-keley'+'i-com').onclick = function () {
 nimo.fn.stop()
 nimo.fn.run()
 }
 document.getElementById('addBall-k'+'eleyi-com').onclick = function () {
 var i;
 for (var i = 0; i < 10; i++) {
 nimo.fn.addBall();
 }
 nimo.fn.drawBall(true);
 }
 }
 </script>
 </body>
 </html>