以下是代码：
<!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=gb2312" />
<title>jjb</title>
<style type="text/css">
* { margin:0px; padding:0px;}
#content{ width:800px; height:500px; position:absolute; left:10px; top:10px; background:url(bg.gif) repeat-x left top;}
#scbox{width:100px; background:#000000; font-weight:bold; color:#FFFFFF; font-size:12px; line-height:22px; padding-left:10px;}
#start{ position:absolute; left:215px; _left:190px; top:140px;}
#life { height:22px; background:#009000; position:absolute; left:110px; top:0px;}
#bottom { width:800px; height:44px; position:absolute; left:0; top:456px; background:#333; z-index:9;}
#startbox { height:150px; position:absolute; left:260px; top:100px; background:#000000; color:#fff; font-size:12px; padding:10px;}
#jia {font-size:40px; font-family:Verdana, Arial, Helvetica, sans-serif; color:#0099CC; position:absolute; z-index:1001;}
#jian {font-size:40px; font-family:Verdana, Arial, Helvetica, sans-serif; color:#FF0000; position:absolute; z-index:1001;}
</style>
<script language="javascript">
(function (){
(new Image()).src = "38.gif";
(new Image()).src = "48.gif";
(new Image()).src = "bike.gif";
(new Image()).src = "bike2.gif";
(new Image()).src = "bg.gif";
})();
//缓存加载图片
function $(id) {return document.getElementById(id);}
var boxBaseAttr = new Object;
boxBaseAttr = {
width : "26px",
height : "40px",
position: "absolute",
top : "30px",
background : "url(38.gif) no-repeat center top",
zIndex : 10
};
var boxBaseAttr2 = new Object;
boxBaseAttr2 = {
width : "26px",
height : "40px",
position: "absolute",
top : "30px",
background : "url(48.gif) no-repeat center top",
zIndex : 10
};
var ele = new Object;
ele = {
div : document.createElement("div"),
span: function (){
var sp = document.createElement("span");
for(var s in boxBaseAttr) {
sp.style[s] = boxBaseAttr[s];
}
sp.setAttribute("type", "good");
return sp;
},
badspan : function (){
var sp2 = document.createElement("span");
for(var s in boxBaseAttr2) {
sp2.style[s] = boxBaseAttr2[s];
}
sp2.setAttribute("type", "bad");
return sp2;
}
};
var sco = 0, lifeWidth = 690, lifes = true;
var bar = {
getScore : function () {
sco += 10;
$("sc").innerHTML = sco;
},
loseScore : function (){
sco -= 10;
$("sc").innerHTML = sco;
},
life : function (){
var life = $("life");
var sl = setInterval(function(){
if(lifeWidth < 23) {
lifes = false;
clearInterval(sl);
return;
}
else {
lifeWidth -= 23;
life.style.width = lifeWidth + "px";
}
},1000);
}
};
var fire = {
init : function (o, x, y) {
o.style.display = "block";
o.style.left = x + "px";
o.style.top = y + "px";
var fs = setInterval(function(){
if (y >= 280) {
y -= 10;
o.style.top = y + "px";
}
else{
clearInterval(fs);
o.style.display = "none";
}
},10);
}
};
/*-- game begin --*/
function game() {
var content = $("content"), x = 0;
var pigBaseAttr = new Object;
pigBaseAttr = {
background : "url(bike.gif) no-repeat center top",
position : "absolute",
top : content.clientHeight-44+"px",
left : (content.clientWidth - 45)/2+"px",
width : "45px",
height : "44px",
zIndex : 1000
};
var pig = ele.div.cloneNode(true);
for(var s in pigBaseAttr) {
pig.style[s] = pigBaseAttr[s];
}
content.appendChild(pig);
/* -- 小猪移动功能begin--*/
content.onmousemove = function (event){
var e = event || window.event;
if ( x > e.clientX) {
//pig.style.width = "110px";
pig.style.background = "url(bike.gif) no-repeat left top";
if (e.clientX -45 < 0) {
pig.style.left = "0px";
} else if(e.clientX + 45 > 800) {
pig.style.left = "755px";
}
else {
pig.style.left = (e.clientX - 45)+"px";
}
}
else if (x < e.clientX) {
//pig.style.width = "110px";
pig.style.background = "url(bike2.gif) no-repeat right top";
if (e.clientX -45 < 0) {
pig.style.left = "0px";
} else if(e.clientX + 45 > 800) {
pig.style.left = "755px";
}
else {
pig.style.left = (e.clientX - 45)+"px";
}
}
x = e.clientX;
}
/*-- 判断是否撞击，传入参数为box和content --*/
function meet(obox,parent) {
var objX = obox.offsetLeft;
var pigX = pig.offsetLeft;
var boxType = obox.getAttribute("type");
if (objX + 26 >= pigX && objX <= pigX + 45) {
if (boxType == "good") {
bar.getScore();
fire.init($("jia"), pigX, pig.offsetTop-30);
}
else if(boxType == "bad") {
bar.loseScore();
fire.init($("jian"), pigX, pig.offsetTop-30);
}
obox.style.left = "-2000px";
}
}
/* -- 创建随机位置的金币 begin--*/
function createbox() {
var box = ele.span();
var b = 30;
var boxLeft = Math.floor(Math.random()*760);//产生随机距离
box.style.left = boxLeft + "px";
content.appendChild(box);
//box进入游戏界面，开始移动，并开始执行函数和pig比对是否撞击
var st = setInterval(function (){
if (b < 460){
box.style.top = b + 5 + "px";
b += 5;
if (b >= 416) {
meet(box, content);
}
}
else {
content.removeChild(box);
clearInterval(st);
b = 30;
}
},5);
}
function createbadbox() {
var box = ele.badspan();
var b = 30;
var boxLeft = Math.floor(Math.random()*760);//产生随机距离
box.style.left = boxLeft + "px";
content.appendChild(box);
//box进入游戏界面，开始移动，并开始执行函数和pig比对是否撞击
var st = setInterval(function (){
if (b < 460){
box.style.top = b + 5 + "px";
b += 5;
if (b > 416) {
meet(box, content);
}
}
else {
content.removeChild(box);
clearInterval(st);
b = 30;
}
},5);
}
bar.life();
/*-- 开始执行循环添加box函数 --*/
var xt = setInterval(function(){
if (lifes == false) {
clearInterval(xt);
alert("时间到，您的得分是："+sco);
lifeWidth = 690;
lifes = true;
sco = 0;
$("startbox").style.display = "block";
$("start").value = "再玩一次";
content.removeChild(pig);
}else{
createbox();
createbadbox();
}
},500);
}
window.onload = function () {
$("start").onclick = function () {
$("startbox").style.display = "none";
new game();
}
}
</script>
</head>
<body>
<div id="content">
<div id="startbox">
<p>游戏规则：</p>
<p>(1) 你只有30秒的时间，用鼠标控制小猪左右移动;</p>
<p>(2) 小猪接到<img src="38.gif" />女孩，加10分；</p>
<p>(3) 小猪接到<img src="48.gif" />女孩，减10分；</p>
<input type="button" id="start" value="开始游戏" />
</div>
<div id="scbox">分数：<span id="sc">0</span></div>
<div id="life" style="width:690px;"></div>
<div id="bottom"></div>
<div id="jia" style="display:none;">+10</div>
<div id="jian" style="display:none;">-10</div>
</div>
</body>
</html>