<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
body {
margin: 0;
padding: 0;
} #game {
width: 800px;
height: 600px;
border: 1px solid #000;
background: url(images/sky.png);
overflow: hidden;
position: relative;
} #game .pipeD {
background: url(images/pipe1.png) top center;
position: absolute;
} #game .pipeU {
background: url(images/pipe2.png) bottom center;
position: absolute;
} #bird {
width: 34px;
height: 25px;
/* border-radius: 10px;
background-color: red;*/
position: absolute;
top: 100px;
left: 100px;
background: url(images/birds.png) -8px -10px no-repeat;
}
</style> </head> <body> <div id="game">
<div id="bird"></div>
</div>
</body>
<script type="text/javascript">
var birdElement = document.getElementById("bird");
var game = document.getElementById("game");
var gameover = false;
var g = 1;
// var i = 0;
var timer=null;
var bird = {
x: birdElement.offsetLeft,
y: birdElement.offsetTop,
speedX: 5,
speedY: 0,
start: birdElement
};
var sky = {
x: 0
}; game.onclick=function(){ setInterval(function () {
//游戏没有结束的时候运行代码
if (!gameover) { //整个游戏背景x轴移动的距离
sky.x = sky.x - bird.speedX;
game.style.backgroundPositionX = sky.x + "px";
//小鸟下落时y轴的坐标
bird.speedY = bird.speedY + g;
//设置一个变量用来接收小鸟下落时y轴的坐标，用来设置小鸟下降时的速度
var step = bird.speedY;
bird.y = bird.y + step; //用一个变量来设定小鸟下落的最低高度，用来 判断游戏是否结束
var overY = game.offsetHeight - birdElement.offsetHeight; //小鸟的y轴坐标大于最低高度，所以游戏停止
if (bird.y > overY) {
bird.y = overY;
stop(sky.x);
}
//小鸟的y轴坐标小于0，说明碰到顶部边框，所以游戏结束
if (bird.y < 0) {
bird.y = 0;
stop(sky.x);
}
//设置游戏开始时小鸟出现的位置
bird.start.style.top = bird.y + "px";
// console.log(bird.x)
}
}, 30); //添加键盘事件，实现键盘上下键控制小鸟
document.onkeyup = function (e) {
if (e.keyCode === 38) {
bird.speedY = -10;
}
} function Pipe(positonX) {
//管子的坐标
this.x = positonX;
this.upPipeY = 0;
this.width = 52;
this.upPipeH = random(100,275);
this.downPipeY = this.upPipeH + 200;
this.downPipeH = game.offsetHeight - this.downPipeY;
// 动态添加管子
var divUp = document.createElement("div");
divUp.className = "pipeU";
divUp.style.width = this.width + "px";
divUp.style.height = this.upPipeH + "px";
divUp.style.left = this.x + "px";
divUp.style.top = this.upPipeY + "px";
game.appendChild(divUp);
var divDown = document.createElement("div");
divDown.className = "pipeD";
divDown.style.width = this.width + "px";
divDown.style.height = this.downPipeH + "px";
divDown.style.left = this.x + "px";
divDown.style.top = this.downPipeY + "px";
game.appendChild(divDown);
//因为定时器会混乱this的指向问题，所以提前保存this的指向，这里的this指向调用该方法的实例
var that = this;
// 设置定时器让管子向后移动
this.timer=setInterval(function () {
//这里1控制的是管子移动的速度 数字越大 难度越高
that.x = that.x - 5;
//简单实现管子无缝滚动，视觉差
if (that.x < -52) {
that.x = 800;
}
if (!gameover) {
divUp.style.left = that.x + "px";
divDown.style.left = that.x + "px";
}
// 设置变量，进行游戏碰撞检测，并停止游戏
var downBoom = (bird.x + 34 > that.x) && (bird.x < that.x + 52) && (bird.y + 25 > that.downPipeY);
var upBoom = (bird.x + 34 > that.x) && (bird.x < that.x + 52) && (bird.y < that.upPipeH);
if (downBoom || upBoom) {
//gameover = true;
stop(sky.x);
}
}, 30);
}
//执行上面的函数方法
var arr=[];
for (var i = 0; i < 4; i++) {
arr[i]=new Pipe(i * 200 + 400);
}
//封装一个用来停止游戏的方法，
function stop(Sky){
var a;
gameover=true;
clearInterval(timer);
for(var i=0;i<arr.length;i++){
clearInterval(arr[i].timer);
}
if(Math.abs(Sky)<=352){
a=0;
alert("成绩："+a)
}else{
a=Math.floor((Math.abs(Sky)-300)/200+1);
// a=Math.ceil(((Math.abs(Sky)-300))/200);
alert("成绩："+a)
}
// console.log(Sky)
}
} function random(a,b){
return Math.round(Math.random()*(a-b)+b)
} </script>
效果如下