JS游戏贪吃蛇

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<body><canvas id="can" width="400" height="400" style="background: Black"></canvas><script>    var sn = [ 42, 41 ], dz = 43, fx = 1, n, ctx = document.getElementById("can").getContext("2d");    function draw(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)            return alert("GAME OVER");        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>

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