JS实现随机乱撞彩色圆球特效的方法

本文实例讲述了JS实现随机乱撞彩色圆球特效的方法。分享给大家供大家参考。具体实现方法如下：

<!doctype html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>JS实现的随机乱撞的彩色圆球特效代码</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>JS实现的随机乱撞的彩色圆球特效代码</h1>
<canvas id="canvas" >
</canvas>
<button id="stop">stop</button>
<button id="run">run</button>
<button id="addBall">addBall</button>
<script src="jquery-1.6.2.min.js"></script>
<script>
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');
  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').onclick=function(){
 nimo.fn.stop()
 }
 document.getElementById('run').onclick=function(){
 nimo.fn.stop()
 nimo.fn.run()
 }
 document.getElementById('addBall').onclick=function(){
 var i;
 for(var i=0;i<10;i++){
  nimo.fn.addBall();
 }
 nimo.fn.drawBall(true);
 }
}
</script>
</body>
</html>

希望本文所述对大家的javascript程序设计有所帮助。