利用javeScript对象以及方法实现的网页弹球游戏，供大家参考，具体内容如下
<!DOCTYPE html> <html> <head> <tilie>呼呼哈嘿的网页弹球</title> </head> <body> <canvaswidth="400"height="400"></canvas> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.js"></script> <script> var canv=document.getElementById("canvas"); var ctx=canv.getContext("2d"); //创建一个小球对象 var ball={ x: 100, y: 100, xSpeed: -5, ySpeed: -5 }; //定义绘制小球的方法 ball.draw=function(){ ctx.beginPath(); ctx.arc(this.x,this.y,10,0,Math.PI*2,false); ctx.fill(); }; //定义小球运动的方法 ball.move=function(){ this.x =this.x+this.xSpeed; this.y =this.y+this.ySpeed; }; //边界判断 ball.checkCanvas=function(panelStart,panelEnd) { if(this.x<0||this.x>400) this.xSpeed=-this.xSpeed; if(this.y<0) this.ySpeed=-this.ySpeed; if(this.y>390){ if(this.x>panelStart && this.x<panelEnd) this.ySpeed=-this.ySpeed; else{ alert("GAME OVER!!!"); this.x= 50; this.y=100; } } }; //定时功能使得小球动起来 setInterval(function() { ctx.clearRect(0,0,400,400); ball.draw(); panel.draw(); ball.move(); ball.checkCanvas(panel.x,panel.x+panel.xSize); ctx.strokeRect(0,0,400,400); },30); //定时函数，每30ms执行一次大括号中的代码； //创建挡板的对象； var panel ={ x:200, y:390, xSize: 50, ySize: 5 }; //挡板移动方法 panel.draw=function(){ ctx.fillRect(this.x,this.y,this.xSize,this.ySize); }; //利用jquery实现按键交互； $("body").keydown(function(event) { console.log(event.keyCode); if(event.keyCode==37){ panel.x=panel.x-5; if(panel.x<0){ panel.x=0; } } if(event.keyCode==39){ panel.x=panel.x+5; if(panel.x>400-50){ panel.x=350; } } } ); </script> </body> </html>
