基于jquery的地址栏射击游戏代码

演示地址:http://demo.3water.com/js/2011/hunt/index.htm

玩法向下看
请看地址栏上的字母 O! 你使用O来向 a射击。 使用键盘上的 左箭头 和 右箭头 移动字母O. 当O移动到 a 上时，按 空格键射击! 游戏会定时30秒时间，按ESC键重新开始。
注：请使用系统自带的IE浏览器来打开本链接。

你使用O来向 a射击。 使用键盘上的 左箭头 和 右箭头 移动字母O. 当O移动到 a 上时，按 空格键射击! 

核心代码:

(function() { 
var Animal, Game; 
var __bind = function(fn, me){ return function(){ return fn.apply(me, arguments); }; }; 
Game = (function() { 
function Game() { 
this.eventReceived = __bind(this.eventReceived, this);; 
this.update = __bind(this.update, this);; this.level = 1; 
this.levelSize = 60; 
this.playerLocation = this.levelSize / 2; 
this.start(); 
} 
Game.prototype.start = function() { 
var num; 
this.points = 0; 
this.startTime = new Date; 
this.timeLimit = 30; 
this.animals = []; 
for (num = 4; num >= 1; num--) { 
this.addAnimal(); 
} 
return this.interval = setInterval(this.update, 1000 / 30); 
}; 
Game.prototype.gameOver = function() { 
clearInterval(this.interval); 
return location.hash = "在" + (this.elapsedTime()) + "秒中你共射中了" + this.points + "个a! (按ESC键重新开始)"; 
}; 
Game.prototype.elapsedTime = function() { 
return Math.floor(((new Date).getTime() - this.startTime.getTime()) / 1000); 
}; 
Game.prototype.addAnimal = function() { 
var animal; 
animal = new Animal(Math.floor(Math.random() * this.levelSize)); 
return this.animals.push(animal); 
}; 
Game.prototype.removeAnimal = function(deadAnimal) { 
var animal; 
return this.animals = (function() { 
var _i, _len, _ref, _results; 
_ref = this.animals; 
_results = []; 
for (_i = 0, _len = _ref.length; _i < _len; _i++) { 
animal = _ref[_i]; 
if (animal !== deadAnimal) { 
_results.push(animal); 
} 
} 
return _results; 
}).call(this); 
}; 
Game.prototype.isAnimalAt = function(position) { 
var animal, matches; 
matches = (function() { 
var _i, _len, _ref, _results; 
_ref = this.animals; 
_results = []; 
for (_i = 0, _len = _ref.length; _i < _len; _i++) { 
animal = _ref[_i]; 
if (Math.floor(animal.position) === position) { 
_results.push(animal); 
} 
} 
return _results; 
}).call(this); 
return matches[0]; 
}; 
Game.prototype.update = function() { 
var animal, position, timeLeft, url, _i, _len, _ref; 
url = []; 
_ref = this.animals; 
for (_i = 0, _len = _ref.length; _i < _len; _i++) { 
animal = _ref[_i]; 
animal.update(this.levelSize); 
} 
while (url.length < this.levelSize) { 
position = url.length; 
if (position === this.playerLocation) { 
if (this.isAnimalAt(this.playerLocation)) { 
url.push("@"); 
} else { 
url.push("O"); 
} 
} else if (this.isAnimalAt(position)) { 
url.push("a"); 
} else { 
url.push("-"); 
} 
} 
timeLeft = this.timeLimit - this.elapsedTime(); 
if (timeLeft <= 0) { 
return this.gameOver(); 
} else { 
if (timeLeft < 10) { 
timeLeft = "0" + timeLeft; 
} 
location.hash = (" " + timeLeft + "|") + url.join("") + ("|" + timeLeft); 
return document.title = "Points " + this.points; 
} 
}; 
Game.prototype.eventReceived = function(event) { 
var animal; 
switch (event.which) { 
case 37: 
this.playerLocation -= 1; 
if (this.playerLocation < 0) { 
return this.playerLocation = this.levelSize - 1; 
} 
break; 
case 39: 
this.playerLocation += 1; 
return this.playerLocation %= this.levelSize; 
case 38: 
case 32: 
animal = this.isAnimalAt(this.playerLocation); 
if (animal) { 
this.points += 1; 
this.removeAnimal(animal); 
console.log(this.animals.length); 
if (this.animals.length === 0) { 
return this.gameOver(); 
} 
} 
break; 
case 27: 
return this.start(); 
} 
}; 
return Game; 
})(); 
Animal = (function() { 
function Animal(position) { 
this.position = position; 
this.velocityChange = Math.random() * 0.5; 
this.velocityIndex = Math.random() * Math.PI; 
this.dampener = 0.4; 
} 
Animal.prototype.update = function(levelSize) { 
this.velocityIndex += Math.random() * this.velocityChange; 
this.position += Math.sin(this.velocityIndex) * this.dampener; 
this.position %= levelSize; 
if (this.position < 0) { 
return this.position += levelSize; 
} 
}; 
return Animal; 
})(); 
$(function() { 
var game; 
game = new Game(); 
return $(document).keydown(game.eventReceived); 
}); 
}).call(this);