技能实现
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</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()", 400);
</script>
</body>
</html>