程序员web前端<html>
<body>
<canvasid=”can”width=”400″height=”400″style=”background:Black”></canvas>
<script>
varsn=[42,41],dz=43,fx=1,n,ctx=document.getElementById(“can”).getContext(“2d”);
functiondraw(t,c){
ctx.fillStyle=c;
ctx.fillRect(t%20*20+1,~~(t/20)*20+1,18,18);
}
document.onkeydown=function(e){
fx=sn[1]-sn[0]==(n=[-1,-20,1,20][(e||event).keyCode-37]||fx)?fx:n
};
!function(){
sn.unshift(n=sn[0]+fx);
if(sn.indexOf(n,1)>0||n<0||n>399||fx==1&&n%20==0||fx==-1&&n%20==19)
returnalert(“GAMEOVER”);
draw(n,”Lime”);
if(n==dz){
while(sn.indexOf(dz=~~(Math.random()*400))>=0);
draw(dz,”Yellow”);
}else
draw(sn.pop(),”Black”);
setTimeout(arguments.callee,130);
}();
</script>
</body>
</html>