js版贪吃蛇

作者: 饥人谷_阿银 | 来源:发表于2019-10-04 09:52 被阅读0次

<!doctype html>
<html>
    
    <body style='overflow:hidden'>
        <canvas id="can" width="400" height="400" style="background:Black;display: block;margin:20px auto;"></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>

</html>