100行JavaScript代码实现JavaScript
- 2020 年 3 月 9 日
- 筆記
先看效果：
100行JavaScript代码实现经典游戏俄罗斯方块
新建一个html文件，复制如下代码，用浏览器打开即可：
<!doctype html> <html> <head> <style type="text/css"> body {background: #000;font: 25px / 25px 宋体;} #box {float: left;width: 252px;border: #999 20px ridge;color: #9f9;text-shadow: 2px 3px 1px #0f0;} #info {float: left;color: #cfc;padding: 24px;} #next {padding: 8px;width: 105px;color: #9f9;text-shadow: 2px 3px 1px #0f0;} </style> </head> <body> <div id="box"></div> <div id="info"> NEXT: <div id="next"></div> <div id="text"></div> </div> <script type="text/javascript"> 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 char = {x: "u3000",s: "u25a0",t: "u25a1"}; var keycom = {"38": "rotate(1)","40": "down()","37": "move(2,1)","39": "move(0.5,-1)","32": "0;pause=!pause"}; var dia, pos, bak, run, next, pause = false, info = {speed: 1,lines: 0,score: 0}; function start(){ dia = next.d; bak = pos = { fk: [], y: 0, x: 4, s: next.s }; nextdia(); document.getElementById("next").innerHTML = (next.d[next.s % next.d.length] | 0x10000).toString(2).slice(-16).replace(/..../g, "$&<br/>").replace(/1/g, char.t).replace(/0/g, char.x); document.getElementById("text").innerHTML = "SCORE:" + info.score + "<br/><br/>LINES:" + info.lines + "<br/><br/>SPEED:" + info.speed; rotate(0); run = setInterval("pause||down()", ~ ~ (Math.pow(1.3, 12 - info.speed) * 30 + 20)); } function over(){ document.onkeydown = null; alert("GAME OVER"); } function nextdia(){ next = {d: tatris[~ ~ (Math.random() * 7)],s: ~ ~ (Math.random() * 4)}; } function update(t){ bak = {fk: pos.fk.slice(0),y: pos.y,x: pos.x,s: pos.s}; if (t) return; for (var i = 0, a2 = ""; i < 22; i++) a2 += map[i].toString(2).slice(1, -1) + "<br/>"; for (var i = 0, n; i < 4; i++) if (/([^0]+)/.test(bak.fk[i].toString(2).replace(/1/g, char.t))) a2 = a2.substr(0, n = (bak.y + i + 1) * 15 - RegExp.$_.length - 4) + RegExp.$1 + a2.slice(n + RegExp.$1.length); document.getElementById("box").innerHTML = a2.replace(/1/g, char.s).replace(/0/g, char.x); } 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, r = 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); ++info.lines % 20 == 0 && info.speed++, r++; } clearInterval(run); if (map[1] != 0x801) return over(); info.score += ~ ~ (Math.pow(r, 1.5) * 10) + 2; 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("pause||" + keycom[(e ? e : event).keyCode]); }; nextdia(); start(); </script></body> </html>
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