代码如下：
<!DOCTYPE html> <html> <head lang="en"> <meta charset="UTF-8"> <title>吃豆人V01</title> </head> <body> <canvas></canvas> <script> var canvas = document.getElementById("canvas"); var context = canvas.getContext("2d"); //TODO 面向对象方式解析 //TODO 1.创建吃豆人的对象模板 function Pacman(){ //TODO 属性 this.isOpen = true;//TODO 开关 this.start = 45*Math.PI/180; this.end = 315*Math.PI/180; //TODO 方法 //TODO 1.绘制方法 this.paint = function(){ //TODO 吃豆人的脸 context.beginPath(); context.arc(250,200,100,this.start,this.end); context.lineTo(250,200); context.closePath(); context.fillStyle = "yellow"; context.fill(); context.stroke(); //TODO 吃豆人的眼睛 context.beginPath(); context.arc(250,150,15,0,Math.PI*2); context.fillStyle = "black"; context.fill(); //TODO 吃豆人的眼神 context.beginPath(); context.arc(255,145,5,0,Math.PI*2); context.fillStyle = "white"; context.fill(); } //TODO 2.控制开闭切换 this.open = function(){ if(this.isOpen){//TODO 开口 this.start = 45*Math.PI/180; this.end = 315*Math.PI/180; this.isOpen = false; }else{//TODO 闭口 this.start = 0; this.end = Math.PI*2; this.isOpen = true; } } } //TODO 创建吃豆人的对象 var pacman = new Pacman(); //TODO 核心控制器 setInterval(function(){ context.clearRect(0,0,canvas.width,canvas.height); pacman.paint(); pacman.open(); },200); </script> </body> </html>