基于jquery的地址栏射击游戏代码

演示地址:http://demo.jb51.net/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。

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() {