贪吃蛇

作者: 云龙789 | 来源:发表于2019-01-25 16:45 被阅读1次

js 贪吃蛇代码

<!doctype html>
<html>
<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 () {
        console.log(sn);
        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>
</html>