先mark，稍后研究，JS代码只有17行！
1 <!DOCTYPE html> 2 <html> 3 <body> 4 <canvas id="myCanvas" width="240" height="240" style="border:1px solid #d3d3d3;">Your browser does not support the HTML5 canvas tag.</canvas> 5 <script> 6 var ctx=document.getElementById("myCanvas").getContext("2d"),r = [{x:10,y:9},{x:10,y:8}],co=40,e=null; 7 ctx.shadowBlur=20,ctx.shadowColor="black"; 8 setInterval(function(){ 9 if(check(r[0],0) || r[0].x < 0 || r[0].x >= 24 || r[0].y < 0 || r[0].y >= 24)return; 10 e!=null&&((co==40&&r[0].x==e.x&&r[0].y+1==e.y)||(co==38&&r[0].x==e.x&&r[0].y-1==e.y)||(co==37&&r[0].x-1==e.x&&r[0].y==e.y)||(co==39&&r[0].x+1==e.x&&r[0].y==e.y))?(r.unshift(e),e=null,r.unshift(r.pop())):(r.unshift(r.pop())); 11 (co==40 || co==38)?(r[0].x=r[1].x,r[0].y=r[1].y+(co==40?1:-1)):(r[0].x=r[1].x+(co==39?1:-1),r[0].y=r[1].y); 12 ctx.clearRect(0,0,240,240); 13 if(e)ctx.fillRect(e.x*10,e.y*10,10,10); 14 for(var i=0;i<r.length;i++)ctx.fillRect(r[i].x*10,r[i].y*10,10,10); 15 while(e==null || check(e))e={y:(Math.random()*24 >>>0),x:(Math.random()*24 >>>0)}; 16 if(check(r[0],0) || r[0].x < 0 || r[0].x >= 24 || r[0].y < 0 || r[0].y >= 24)alert("game over\nYou get ["+(r.length-2)+"]"); 17 },100); 18 document.onkeyup = function(event){co=event.keyCode>=37 && event.keyCode<=40 && (Math.abs(event.keyCode-co) != 2)?event.keyCode:co;} 19 function check(e,j){ 20 for(var i=0;i<r.length;i++)if(j!=i && r[i].x==e.x && r[i].y==e.y)return true; 21 return false; 22 } 23 </script> 24 </body> 25 </html>
不得不说，HTML5的出现，为各种实现创造了很多便利啊！