教你如何在HTML5全栈开发中用十几行代码做出贪吃蛇，直接上源码：
<!DOCTYPE
html>
<html>
<body>
<canvas id="myCanvas" width="240"
height="240" style="border:1px solid #d3d3d3;">
Your browser does not
support the HTML5 canvas tag.
</canvas>
<script>
var
ctx=document.getElementById("myCanvas").getContext("2d"),r =
[{x:10,y:9},{x:10,y:8}],co=40,e=null;
ctx.shadowBlur=20,ctx.shadowColor="black";
setInterval(function(){
if(check(r[0],0)
|| r[0].x < 0 || r[0].x >= 24 || r[0].y < 0 || r[0].y >=
24)return;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()));
(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);
ctx.clearRect(0,0,240,240);
if(e)ctx.fillRect(e.x*10,e.y*10,10,10);
for(var
i=0;i<r.length;i++)ctx.fillRect(r[i].x*10,r[i].y*10,10,10);
while(e==null
|| check(e))e={y:(Math.random()*24 >>>0),x:(Math.random()*24
>>>0)};
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)+"]");
},100);
document.onkeyup = function(event){co=event.keyCode>=37
&& event.keyCode<=40 && (Math.abs(event.keyCode-co) !=
2)?event.keyCode:co;}
function check(e,j){ for(var
i=0;i<r.length;i++)if(j!=i && r[i].x==e.x &&
r[i].y==e.y)return true; return
false;}
</script>
</body>
</html>