13行js写贪吃蛇游戏

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<!DOCTYPE html>
<canvas id="1" width="400" height="400"></canvas>
<script>
let dir=1,food=3,snk=[1,0],ctx=document.getElementById("1").getContext("2d")
document.onkeydown=e=>{dir = snk[0]-snk[1]==-(tmp = [-1,-10,1,10][e.keyCode-37]||dir)?dir:tmp }
setInterval(()=>{
snk.unshift(Head = snk[0] + dir)
if(Head!=food) snk.pop()
else while(snk.includes(food=0|Math.random()*10*10)) ;
if(snk.indexOf(Head,1)!=-1||(dir==1&&Head%10==0)||(dir==-1&&Head%10==9)||Head<0||Head>=100)
return document.write(0&snk.shift()) //
for(let i=0; i<100; i++){
ctx.fillStyle = '#0'+(food==i)*9910+snk.includes(i)*1990
ctx.fillRect(i%10*40,(i-i%10)*4, 40,40)
}
},100)
</script>

<!DOCTYPE html>
<canvas id="1" width="400" height="400"></canvas>
<script>
let dir=1,food=3,snk=[1,0],n_=0, ctx=document.getElementById("1").getContext("2d")
document.onkeydown=e=>{ dir =snk[0]-snk[1]==-(tmp = [-1,-10,1,10][e.keyCode-37]||dir)?dir:tmp }
setInterval(()=>{
snk.unshift(Head = snk[0] + dir)
if(Head!=food) snk.pop()
else while(snk.includes(food=0|Math.random()*10*10)) ;
if(snk.indexOf(Head,1)!=-1||(dir==1&&Head%10==0)||(dir==-1&&Head%10==9)||Head<0||Head>=100)
return alert("died"+ ++n_+"times") //
for(let i=0 ; i<100; i++){
ctx.fillStyle = '#0'+~~((food===i)*13000*Math.random())+~~(snk.includes(i)*3000*Math.random())
ctx.fillRect(i%10*40,(i-i%10)*4, 40,40)
}
},120)
</script>

900

^1100char

<!DOCTYPE html>
<canvas id="1" width="400" height="400" style="border: 1px solid "></canvas>
<script>
ctx = document.getElementById("1").getContext("2d") //CanvasRenderingContext2D inferface
let Len = 10, dir = 2, dirNow ; //dirNow
food = [3, 0]; Snake = [[0, 0], [1, 0]] //,Snake
Map = {'0,0':'#52a', '1,0':'#52a'} //
dirMat = [[-1, 0], [0, -1], [1, 0], [0, 1]] //
pairEq = ((p1, p2) => p1[0] == p2[0] && p1[1] == p2[1]) //
document.onkeydown = e =>{
if (37 <= e.keyCode == e.keyCode < 41 && dirNow != ( (e.keyCode - 35) % 4) ) //
dir = e.keyCode -37
}
!function () {
Head = Snake[Snake.length-1].map((x, i) => x + dirMat[dirNow=dir][i]); //
if (!pairEq(Head, food))
Map[Snake.shift()]='#fff' //,,
if (Snake.some(x=>pairEq(x,Head)) || !Head.every(x => 0<=x == x < Len)) //
return document.write("Game Over") //document.write
Snake.push(Head); //
while (Snake.some(x => pairEq(x, food))) //,
food = [~~(Math.random() * Len), ~~(Math.random() * Len)]; //js, ~~
Map[Head] = '#52a' ; Map[food] = '#ad5'
for( k in Map){
ctx.fillStyle= Map[k]
ctx.fillRect(parseInt(k[0])*40,parseInt(k[2])*40,40,40) //e.g. k="1,3",10
}
setTimeout(arguments.callee, 100); //100ms
}()
</script>

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