js小游戏----贪吃蛇

来源：互联网发布：零基础软件测试编辑：程序博客网时间：2024/04/28 23:51

<html xmlns="http://www.w3.org/1999/xhtml

">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
    <title></title>
</head>
<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>
</html>

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