 <!doctype html>

 <html>

 <head>

 <title>HTML5 隨機(jī)彈跳的小球</title>

 <style>

 body{

 font-family: 微軟雅黑;    

 }

 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 隨機(jī)彈跳的小球</h1>

 <div>請(qǐng)使用支持HTML5的瀏覽器開打本頁(yè)。 <button id="stop-keleyi-com">暫停</button>

 <button id="run-keleyi-com">繼續(xù)</button>

 <button id="addBall-keleyi-com">增加小球</button> <button onclick="javascript:window.location.reload();">刷新</button>

 <br />每次刷新頁(yè)面的小球大小，顏色，運(yùn)動(dòng)路線，都是新的，可以點(diǎn)擊上面各個(gè)按鈕看看效果。

 </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) {//生產(chǎn)隨機(jī)數(shù)

 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>