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RSS订阅用JS写的一个贪吃蛇游戏 分享下
wasd 控制方向
代码写得有点烂，欢迎大家点评
<html>
<head>
<title>贪吃蛇游戏</title>
<script type="text/javascript">
var width = 15; //蛇运动区域宽
var height = 15; //蛇运动区域高
var snakeLength = 3; //蛇的初始长度
var timerId ;
var direction = "X++"; //蛇朝哪方向前进，初始化向右
var lastMov_id = null; //蛇前进一步时，记录蛇的尾巴上次的位置
var score = 0; //得分
var randomEgg ; //随机产生的蛋
var bgColor = "#00FFE0"; //背景色
alltds = document.getElementsByTagName("td");
var snake = new Array();
function drawBgColor(){
for(i=0;i<alltds.length;i++){
alltds[i].style.backgroundColor = bgColor;
}
}
function drawSnake(){
if(snake.length == 0){ //初始化蛇的长度
for(i=0;i<snakeLength;i++){
snakeId = "0|"+i;
snake[i] = snakeId;
}
}else{
getSnakeArray();
}
for(i=0;i<snake.length;i++){
changeBgColor(snake[i],"red");
}
if(lastMov_id != null){
changeBgColor(lastMov_id,bgColor);
}
if(snake[snake.length-1] == randomEgg){
drawEgg();
}
msg.innerHTML = "得分："+score;
timerId = window.setTimeout("drawSnake()",300);
}
function getSnakeArray(){
if(direction == ""){
return;
}
lastMov_id = snake[0];
movIds = snake[snake.length-1].split("|");
movIds_Y = parseInt(movIds[0]);
movId_X = parseInt(movIds[1]);
eval(direction.replace("X","movId_X").replace("Y","movIds_Y"));
newLeaderId = movIds_Y+"|"+movId_X;
if(isLoss(newLeaderId)){
alert("哈哈，输啦~~");
window.location.reload();
}
if(newLeaderId == randomEgg){ //吃到蛋，得分+1，蛇的长度+1
score ++;
snake.length ++;
snake[snake.length-1] = newLeaderId;
lastMov_id = null;
}else{ //否则蛇向前移动一步
for(i=0;i<snake.length;i++){
if(i == snake.length-1){
snake[i] = newLeaderId;
break;
}
snake[i] = snake[i+1];
}
}
}
function isLoss(newId){ //判断是否输了
var curid = newId.split("|");
cur_Y = curid[0];
cur_X = curid[1];
if(cur_Y < 0 || cur_X < 0){
return true;
}
if(cur_Y > height-1 || cur_X > width-1){
return true;
}
for(i=0;i<snake.length-1;i++){
if(newId == snake[i])
return true;
}
return false;
}
function drawEgg(){
while(true){ //如果产生的蛋与蛇重合，则从新产生
randomEgg = getRandomNum(0,height)+"|"+getRandomNum(0,width);
if(contains(randomEgg) == false){
break;
}
}
changeBgColor(randomEgg,"blue");
}
function contains(con){
for(i=0;i<snake.length;i++){
if(snake[i] == randomEgg)
return true;
}
return false;
}
function getRandomNum(min,max){
var randomNum = parseInt(Math.random()*(max-min)+min);
return randomNum;
}
function changeBgColor(obj,color){
if(typeof(obj) == "string"){
obj = document.getElementById(obj);
}
try{
obj.style.backgroundColor = color;
}catch(e){
}
}
function keyEvent(){
oldDirection = direction;
var keyNum = event.keyCode;
if(keyNum == 87){ //w
direction = "Y--";
}else if(keyNum == 83){ //s
direction = "Y++";
}else if(keyNum == 65){ //a
direction = "X--";
}else if(keyNum == 68){ //d
direction = "X++";
}
if(oldDirection.substr(0,1) == direction.substr(0,1) && oldDirection.substr(1,2) != direction.substr(1,2))
{
direction = oldDirection; //不能向后退
}
}
function startGame(){
drawEgg();
drawSnake();
startBtn.disabled = true;
}
</script>
</head>
<body>
<script type="text/javascript">
document.write("<table border=solid>");
for(i=0;i<height;i++){
document.write("<tr>");
for(j=0;j<width;j++){
document.write("<td id="+(i+"|"+j)+" height=20px width=20px>");
document.write(" ");
document.write("</td>");
}
document.write("</tr>");
}
document.write("</table>");
drawBgColor();
document.write("<font id=msg></font>");
document.write("<br/><button id=\"startBtn\">开始</button>");
startBtn.onclick = function(){
startGame();
};
document.onkeydown = function(){ //监听鼠标事件
keyEvent();
}
</script>
</body>
</html>
2009-11-25
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