近期学习js，假期无事，参照网上的代码写了个双人玩的贪吃蛇。
对网上的代码作了些改造,具体如下：
1，把m*n的二维数组变成m*n一维数组，映射关系为：
A[r]------>a[i][j];
i = r%m;
j = (r-r%m)/m;
j<n;
2，对随机数的获取作了些改造，
3，蛇尾总是第一个加入的元素，
代码编写仓促，也没写注释，望各位见谅
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>snake</title>
<script type='text/javascript' >
(function(){
if (!window.Snake)
window.Snake = {};
Snake = function(container, name){
this.container = container;
this.name = '_' + name + '_';
this.dir = 0;
this.testDir = 0;
this.head = -1;
this.run = 0;
this.speed=300;
this.count={};
if (typeof Snake.prototype._init == 'undefined') {
Snake.prototype.control = function(n){
if (Math.abs(this.testDir) == Math.abs(n))
return;
this.dir = n;
};
Snake.prototype.move = function(){
if (this.container.win) {
clearInterval(this.run);
return;
}
var _left = this.head % this.container.width;
var _top = (this.head - this.head % this.container.width) / this.container.width;
this.dir % this.container.width == 0 ? _top += this.dir / this.container.width : _left += this.dir;
if (_left < 0 || _left >= this.container.width || _top < 0 || _top >= this.container.height || (this.container.all[this.head + this.dir] && this.container.all[this.head + this.dir].indexOf(this.name) != -1)) {
this.container.win = true;
alert(this.name+' lose ~_~');
return;
}
if (!this.container.all[this.head + this.dir]) {
this.container.all[this.head + this.dir] = this.name;
var _div = this.getDivByClass(this.name)[0];
this.container.all[parseInt(_div.style.left) / 20 + parseInt(_div.style.top) / 20 * this.container.width] = this.container.all[parseInt(_div.style.left) / 20 + parseInt(_div.style.top) / 20 * this.container.width].replace(this.name, '');
_div.style.left = _left * 20 + 'px';
_div.style.top = _top * 20 + 'px';
this.container.div.appendChild(_div);
}
else
if (this.head + this.dir == this.container.food) {
var _div = this.getDivByClass(this.container.foodClass)[0];
_div.className = this.name;
this.container.div.appendChild(_div);
this.container.createFood();
this.container.all[this.head + this.dir] = this.name;
}
else {
var _str = this.container.all[this.head + this.dir];
var _divs = this.getDivByClass(_str);
var _div = _divs[0];
if (_divs.length > 1 && parseInt(_div.style.left) / 20 + parseInt(_div.style.top) / 20 * this.container.width == this.head + this.dir) {
this.container.all[this.head + this.dir] = this.name;
_div.className = this.name;
this.container.div.appendChild(_div);
}
else {
this.container.all[this.head + this.dir] += this.name;
var _div = this.getDivByClass(this.name)[0];
this.container.all[parseInt(_div.style.left) / 20 + parseInt(_div.style.top) / 20 * this.container.width] = this.container.all[parseInt(_div.style.left) / 20 + parseInt(_div.style.top) / 20 * this.container.width].replace(this.name, '');
_div.style.left = _left * 20 + 'px';
_div.style.top = _top * 20 + 'px';
this.container.div.appendChild(_div);
}
}
var lth=this.getDivByClass(this.name).length
if(lth>=this.container.bet){
this.container.win=true;
alert(this.name+' win ^-^');
}
this.count.innerHTML=this.name+': '+lth.toString();
this.head += this.dir;
this.testDir = this.dir;
};
Snake.prototype.getDivByClass = function(name){
var _divs = this.container.div.getElementsByTagName('DIV');
var _result = [];
for (var i = 0; i < _divs.length; i++) {
if (_divs[i].className == name)
_result.push(_divs[i]);
}
return _result;
};
Snake.prototype.acc=function(n){
return this.speed+n>50? this.speed+n:this.speed;
}
Snake.prototype.init = function(){
this.head = this.container.getRandom();
this.container.all[this.head] = this.name;
var _left = this.head % this.container.width * 20 + 'px';
var _top = (this.head - this.head % this.container.width) / this.container.width * 20 + 'px';
var _div = document.createElement('DIV');
_div.className = this.name;
_div.style.left = _left;
_div.style.top = _top;
this.count=document.createElement('P');
this.count.innerHTML=this.name+': 1';
this.container.counts.push(this.count);
this.container.div.appendChild(_div);
}
}
Snake.prototype._init = true;
}
if (!window.Container)
window.Container = {};
Container = function(width, height, foodClass, bet){
this.width = width;
this.height = height;
this.food = -1;
this.foodClass = '_' + foodClass + '_';
this.bet = bet;
this.win = false;
this.all = [];
this.counts=[];
var _div = document.createElement('DIV');
_div.className = 'container';
//_div.style.position = 'absolute';
_div.style.width = this.width * 20 + 'px';
_div.style.height = this.height * 20 + 'px';
this.div = _div;
this.getRandom = function(){
var _remain = [];
for (var i = 0; i < width * height; i++) {
if (this.all[i])
continue;
_remain.push(i);
}
var _index = Math.floor(Math.random() * _remain.length);
return _remain[_index];
}
this.createFood = function(){
var _food = this.getRandom();
this.food = _food;
this.all[_food] = this.foodClass;
var _fDiv = document.createElement('DIV');
_fDiv.className = this.foodClass;
var _left = _food % this.width * 20 + 'px';
var _top = (_food - _food % this.width) / this.width * 20 + 'px';
_fDiv.style.left = _left;
_fDiv.style.top = _top;
this.div.appendChild(_fDiv);
}
}
})();
var container = new Container(30, 30, 'food', 20);
var snakeA = new Snake(container, 'snakeA');
var snakeB = new Snake(container, 'snakeB');
function game(){
container.createFood();
snakeA.init();
snakeB.init();
function allcontrol(e){
e = e || window.event;
var n = e.keyCode;
switch (n) {
case 37:
snakeA.control(-1);
break;
case 38:
snakeA.control(-container.width);
break;
case 39:
snakeA.control(1);
break;
case 40:
snakeA.control(container.width);
break;
case 65:
snakeB.control(-1);
break;
case 87:
snakeB.control(-container.width);
break;
case 68:
snakeB.control(1);
break;
case 83:
snakeB.control(container.width);
break;
case 96:
if(snakeA.run){
clearInterval(snakeA.run);
snakeA.speed=snakeA.acc(-50);
snakeA.run=setInterval('snakeA.move()',snakeA.acc(-50));
}
break;
case 110:
if(snakeA.run){
clearInterval(snakeA.run);
snakeA.speed=snakeA.acc(20);
snakeA.run=setInterval('snakeA.move()',snakeA.acc(50));
}
break;
case 71:
if(snakeB.run){
clearInterval(snakeB.run);
snakeB.speed=snakeB.acc(-20);
snakeB.run=setInterval('snakeB.move()',snakeB.acc(-50));
}
break;
case 72:
if(snakeB.run){
clearInterval(snakeB.run);
snakeB.speed=snakeB.acc(20);
snakeB.run=setInterval('snakeB.move()',snakeB.acc(50));
}
break;
}
if (!snakeA.run && snakeA.dir)
snakeA.run = setInterval('snakeA.move()', 300);
if (!snakeB.run && snakeB.dir)
snakeB.run = setInterval('snakeB.move()', 300);
}
var _wrap=document.createElement('DIV');
_wrap.appendChild(container.counts[1]);
_wrap.appendChild(container.div);
_wrap.appendChild(container.counts[0]);
document.body.appendChild(_wrap);
var des=document.createElement('DIV');
des.style.clear='both';
des.style.position='relative';
des.style.padding='20px';
des.innerHTML='snakeA:键盘上↑↓←→代表方向控制，小键盘上0加速，.减速<br/>snakeB:键盘上A W S D代表方向控制，键盘上G加速，H减速<br/>两条蛇可以相互吃掉对方尾部，先吃到20个食物为赢';
document.body.appendChild(des);
if (document.addEventListener) {
document.addEventListener('keydown', allcontrol, false);
}
else
if (document.attachEvent) {
document.attachEvent('onkeydown', allcontrol);
}
}
window.onload = game;
</script>
<style type='text/css'>
p{
float:left;
margin:10px;
padding:20px;
font-weight:bolder;
border:1px solid #000;
text-align:center;
vertical-align:text-bottom;;
}
.container{
position:relative;
float:left;
margin:10px;
padding:0;
border:1px solid #000;
}
._snakeA_{
position:absolute;
margin:0;
padding:0;
width:20px;
height:20px;
border:1px solid #ccc;
background-color:red;
}
._food_{
position:absolute;
margin:0;
padding:0;
width:20px;
height:20px;
border:1px solid #ccc;
background-color:green;
}
._snakeB_{
position:absolute;
margin:0;
padding:0;
width:20px;
height:20px;
border:1px solid #ccc;
background-color:#2E2E2E;
}
</style>
<script type='text/javascript'>
</script>
</head>
<body >
</body>
</html>