原生JS实现俄罗斯方块
<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GBK">
</head>
<body>
<div id="box" style="width:252px;font:25px/25px 宋体;background:#000;color:#9f9;text-shadow:2px 3px 1px #0f0;"></div>
<script>var map = eval("[" + Array(23).join("0x801,") + "0xfff]");
var tatris = [[0x6600], [0x2222, 0xf00], [0xc600, 0x2640], [0x6c00, 0x4620], [0x4460, 0x2e0, 0x6220, 0x740], [0x2260, 0xe20, 0x6440, 0x4700], [0x2620, 0x720, 0x2320, 0x2700]];
var keycom = {"38": "rotate(1)", "40": "down()", "37": "move(2,1)", "39": "move(0.5,-1)"};
var dia, pos, bak, run;
function start() {
    dia = tatris[~~(Math.random() * 7)];
    bak = pos = {fk: [], y: 0, x: 4, s: ~~(Math.random() * 4)};
    rotate(0);
}
function over() {
    document.onkeydown = null;
    clearInterval(run);
    alert("GAME OVER");
}
function update(t) {
    bak = {fk: pos.fk.slice(0), y: pos.y, x: pos.x, s: pos.s};
    if (t) return;
    for (var i = 0, a2 = ""; i < 22; i++)        a2 += map[i].toString(2).slice(1, -1) + "<br/>";
    for (var i = 0, n; i < 4; i++)        if (/([^0]+)/.test(bak.fk[i].toString(2).replace(/1/g, "\u25a1")))            a2 = a2.substr(0, n = (bak.y + i + 1) * 15 - RegExp.$_.length - 4) + RegExp.$1 + a2.slice(n + RegExp.$1.length);
    document.getElementById("box").innerHTML = a2.replace(/1/g, "\u25a0").replace(/0/g, "\u3000");
}
function is() {
    for (var i = 0; i < 4; i++)        if ((pos.fk[i] & map[pos.y + i]) != 0) return pos = bak;
}
function rotate(r) {
    var f = dia[pos.s = (pos.s + r) % dia.length];
    for (var i = 0; i < 4; i++)        pos.fk[i] = (f >> (12 - i * 4) & 15) << pos.x;
    update(is());
}
function down() {
    ++pos.y;
    if (is()) {
        for (var i = 0; i < 4 && pos.y + i < 22; i++)            if ((map[pos.y + i] |= pos.fk[i]) == 0xfff)                map.splice(pos.y + i, 1), map.unshift(0x801);
        if (map[1] != 0x801) return over();
        start();
    }
    update();
}
function move(t, k) {
    pos.x += k;
    for (var i = 0; i < 4; i++)        pos.fk[i] *= t;
    update(is());
}
document.onkeydown = function (e) {
    eval(keycom[(e ? e : event).keyCode]);
};
start();
run = setInterval("down()", 200);</script>
</body>
</html>

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