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javascript制作贪吃蛇游戏

文章类别:Javascript | 发表日期:2010-3-6 9:01:13

1、IE: element.innerText = FF: element.textContent;
2、setAttribute("cellpadding","0")在IE中无效,正确写法cellPadding (一不小心就犯错了);
3、FF中,使用绑定在某元素上的键盘事件前,先让它获得焦点,document也不例外,这容易疏忽;
4、在IE中create table element,记得加tbody;
5、画面每渲染一次只有一次方向键有效,注意程序中的变量 allowPress (修复#2、#4、#5提到的问题);

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>贪吃蛇 - by CNwander</title>
<style type="text/css">
* {margin:0; padding:0}
body {background:#333; -moz-user-select:none; text-align:center; font-size:12px}
table {margin:80px auto 10px auto; overflow:hidden; border-collapse:collapse; }
td {width:20px; height:20px; border:1px solid #eee; background:#f4f4f4}
.cover {background:#39c;}
.food {background:#093}
.block {background:#333}
.brake {background:#f00}
.skate {background:#00f}
#say {margin-top:50px; color:white}
#help {width:420px; margin:0 auto; line-height:17px; color:white}
#help span {float:left; margin-right:10px}
#help .box {width:15px; height:15px; margin-right:5px; border:1px solid white}
#btnStart {clear:both; width:100px; height:30px; margin-top:10px; padding:0; background:#bbb; color:#222; border:1px solid #fff; border-bottom-color:#000; border-right-color:#000; cursor:pointer}
</style>
<script type="text/javascript">
// code by CNwander.
// common
function $(str) {
 return document.getElementById(str);
}
function ../tag/tag_Javascript.html(str,target) {
 target = target || document;
 return target.getElementsByTagName(str);
}
// global
// const
var WIDTH = 20, //网格宽度
 HEIGHT = 20, //网格高度
 SAY = ["相当不错,虽然说和CNwander还不是一个级别的","可以啊,再加点油都可以和CNwander媲美了!","一个字,牛,连CNwander都甘拜下风了","差不多行了,别把游戏玩爆了"];
var len = 3, //蛇的长度
 speed, //爬行速度
 gridElems = multiArray(WIDTH,HEIGHT), //单元格对象
 carrier, //承载对象(食物,障碍,滑板,刹车)
 snake, //蛇每节的坐标点
 info, //交互对话
 btnStart, //开始按钮
 topScore = len,
 snakeTimer, //蛇行走计时器
 brakeTimers = [], //随机刹车
 skateTimers = [], //随机滑板
 directkey, // 方向键值 37-40 左上右下
 allowPress = true;
window.onload = function(){
 info = $("say");
 btnStart = $("btnStart");
 initGrid(); //网格初始化
 document.onkeydown = attachEvents; //绑定方向事件
 btnStart.onclick = function (e) {
  btnStart.blur(); //firefox中必须释放焦点
  start(); //游戏开始
  btnStart.setAttribute("disabled",true);
  btnStart.style.color = "#aaa";
 }
}
//开始游戏
function start() {
 len = 3;
 speed = 10;
 directkey = 39;
 carrier = multiArray(WIDTH,HEIGHT);
 snake = new Array();
 clear();
 initSnake(); //蛇初始化
 addObject("food");
 walk();
 addRandomBrake();
}
//创建网格
function initGrid() {
 var body = ../tag/tag_Javascript.html("body")[0];
 var table = document.createElement("table"),
  tbody = document.createElement("tbody")
 for(var j = 0; j < HEIGHT; j++) { 
  var col = document.createElement("tr"); 
  for(var i = 0; i < WIDTH; i++) { 
   var row = document.createElement("td");
   gridElems[i][j] = col.appendChild(row); 
  }
  tbody.appendChild(col); 
 }
 table.appendChild(tbody);
 $("snakeWrap").appendChild(table);
}
//创建蛇
function initSnake() {
 var pointer = randomPointer(len-1, len-1, WIDTH/2);
 for(var i = 0; i < len; i++) {
  var x = pointer[0] - i,
   y = pointer[1];
  snake.push([x,y]);
  carrier[x][y] = "cover";
 }
}
//添加键盘事件
function attachEvents(e) {
 e = e || event;
 if( allowPress )
 directkey = Math.abs(e.keyCode - directkey) != 2 && e.keyCode > 36 && e.keyCode < 41 ? e.keyCode : directkey; //非方向键、反向无效
 allowPress = false;
 return false;
}
function walk() {
 if(snakeTimer) window.clearInterval(snakeTimer);
 snakeTimer = window.setInterval(step, Math.floor(3000/speed));
}
function step() {
 //获取目标点
 var headX = snake[0][0],
  headY = snake[0][1];
 switch(directkey) {
  case 37: headX -= 1; break;
  case 38: headY -= 1; break;
  case 39: headX += 1; break
  case 40: headY += 1; break;
 }
 //碰到边界,阻挡物,则结束游戏
 if(headX >= WIDTH || headX < 0 || headY >= HEIGHT || headY < 0 || carrier[headX][headY] == "block" || carrier[headX][headY] == "cover" ) {
  trace("GAME OVER");
  if(getText($("score"))*1 < len) trace(len,$("score"));
  btnStart.removeAttribute("disabled");
  btnStart.style.color = "#000";
  window.clearInterval(snakeTimer);
  for(var i = 0; i < brakeTimers.length; i++) window.clearTimeout(brakeTimers[i]);
  for(var i = 0; i < skateTimers.length; i++) window.clearTimeout(skateTimers[i]);
  return;
 }
 //加速
 if(len % 4 == 0 && speed < 60 && carrier[headX][headY] == "food") {
  speed += 5;
  walk(); 
  trace("加速!");
 }
 //捡到刹车
 if(carrier[headX][headY] == "brake") {
  speed = 5;
  walk();
  trace("恭喜!捡到刹车一个。");
 }
 //遭遇滑板
 if(carrier[headX][headY] == "skate") {
  speed += 20;
  walk();
  trace("遭遇滑板!");
 } 
 //添加阻挡物
 if(len % 6 == 0 && len < 60 && carrier[headX][headY] == "food") {
  addObject("block");
 } 
 //对话
 if(len <= 40 && len % 10 == 0) {
  var cheer = SAY[len/10-1];
  trace(cheer);
 } 
 //吃东西
 if(carrier[headX][headY] != "food") {
  var lastX = snake[snake.length-1][0],
   lastY = snake[snake.length-1][1];
  carrier[lastX][lastY] = false;
  gridElems[lastX][lastY].className = "";
  snake.pop();
 } else {
  carrier[headX][headY] = false;
  trace("吃到食物");
  addObject("food");
 }
 snake.unshift([headX,headY]);
 carrier[headX][headY] = "cover";
 gridElems[headX][headY].className = "cover";
 
 len = snake.length;
 allowPress = true;
}
//添加物品
function addObject(name) {
 var p = randomPointer();
 carrier[p[0]][p[1]] = name;
 gridElems[p[0]][p[1]].className = name;
}
//添加随机数量刹车和滑板
function addRandomBrake() {
 var num = randowNum(1,5);
 for(var i = 0; i < num; i++) {
  brakeTimers.push( window.setTimeout(function(){addObject("brake")},randowNum(10000,100000)) );
  skateTimers.push( window.setTimeout(function(){addObject("skate")},randowNum(5000,100000)) );
 }  
}
//输出信息
function trace(sth,who) {
 who = who || info;
 if(document.all) who.innerText = sth;
 else who.textContent = sth;
}
//获取信息
function getText(target) {
 if(document.all) return target.innerText;
 else return target.textContent;
}
//创建二维数组
function multiArray(m,n) {
 var arr =  new Array(n);
 for(var i=0; i<m; i++)
  arr[i] = new Array(m);
 return arr;
}
//清除画面
function clear() {
 for(var y = 0; y < gridElems.length; y++) {
  for(var x = 0; x < gridElems[y].length; x++) {
   gridElems[x][y].className = "";
  }
 }
}
//产生指定范围随机点
function randomPointer(startX,startY,endX,endY) {
 startX = startX || 0;
 startY = startY || 0;
 endX = endX || WIDTH;
 endY = endY || HEIGHT;
 var p = [],
  x = Math.floor(Math.random()*(endX - startX)) + startX,
  y = Math.floor(Math.random()*(endY - startY)) + startY;
 if(carrier[x][y]) return randomPointer(startX,startY,endX,endY);
 p[0] = x;
 p[1] = y;
 return p;
}
//产生随机整数
function randowNum(start,end) {
 return Math.floor(Math.random()*(end - start)) + start;
}
</script>
</head>
<body onselectstart="return false">
 <div id="say">贪吃蛇</div>
    <div id="snakeWrap"></div>
    <div id="help">
     <span class="box food"></span><span>绿色食物</span>
        <span class="box block"></span><span>灰色毒品</span>
        <span class="box skate"></span><span>蓝色滑板</span>
        <span class="box brake"></span><span>红色刹车</span>
        <span style="float:right">最高分:<strong id="score">0</strong></span>
        <input type="button" id="btnStart" value="开始游戏" />
    </div>
</body>
</html>

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