转自https://bbs.csdn.net/topics/390793064?page=1
<!doctype html><html><head></head><body>
<div id="box" style="256px;font:25px/25px 宋体;background:#000;color:#9f9;"></div><script>
var arr=[15];
var next=10;//最好判断一下arr[1]!=arr[0]+x
document.onkeydown=function(e){next={'37':-1,'39':1,'38':-10,'40':10}[(e?e:event).keyCode]};
var run=setInterval(function(){
var list=['-1&&arr[0]%10==0','1&&arr[0]%10==9','-10&&arr[0]<10','10&&arr[0]>189'];
var temp=arr[0]+next;
if(list.some(function(x){return eval('next=='+x)})||arr.indexOf(temp)>=0)
return clearInterval(run)||alert('OVER');
arr.unshift(temp);
if(this.food==null||food==temp){
list=[];//(list=Array(200)).forEach(function(val,i){list[i]=i});
for(var i=0;i<200;i++)
list.push(i);
list=list.filter(function(x){return arr.indexOf(x)<0});
food=list[Math.round(Math.random()*(list.length-1))];//food是全局变量
}
else
arr.pop();
var s='';
for(var j=0;j<200;j++){//这个循环还可以缩短
if(j%10==0&&j!=0)
s+='<br/>';
if(arr.indexOf(j)>=0)
s+='u25a0';
else if(j==food)
s+='u2605';
else
s+=' ';
}
document.getElementById("box").innerHTML=s;
},200);
</script></body></html>