本文實例講述了JS實現隨機亂撞彩色圓球特效的方法。分享給大家供大家參考。具體實現方法如下：
<!doctype html><html lang="en"><head> <meta charset="UTF-8"> <title>JS實現的隨機亂撞的彩色圓球特效代碼</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>JS實現的隨機亂撞的彩色圓球特效代碼</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){//生產隨機數 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>希望本文所述對大家的javascript程序設計有所幫助。
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