Address bar shooting game code based on jquery_jquery

Demo address:http://demo.jb51.net/js/2011/hunt/index.htm

Look down for gameplay
Please see the address Letter O on the bar! You use the O to shoot at the a. Use the left and right arrows on your keyboard to move the letter O. When the O moves over a, press the space bar to shoot! The game will time out for 30 seconds, press the ESC key to restart.
Note: Please use the IE browser that comes with the system to open this link.

You use O to shoot at a. Use the Left Arrow and Right Arrow on your keyboard to move the letter O. When the O moves over a, press the Spacebar to shoot!

Core code:

Copy code The code is as follows:

(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 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 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 animal = _ref[_i];
animal.update(this.levelSize);
}
while (url.length 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 return this.gameOver();
} else {
if (timeLeft 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 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 return this.position = levelSize;
}
};
return Animal;
})();
$(function() {
var game;
game = new Game();
return $(document).keydown(game.eventReceived);
});
}).call(this);