使用Javascript做贪吃蛇小游戏,
1.自定义地图宽高,蛇的初始速度
2.食物随机出现
3.蛇的样式属性
4.贪吃蛇玩法(吃食物,碰到边界,吃食物后加速,计分,)
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{
padding: 0;
margin: 0;
}
</style>
</head>
<body>
<input type="text" id="fen" value="0" disabled>
<script type="text/javascript">
var kuang = parseInt(prompt("请输入地图宽度"));
var gao = parseInt(prompt("请输入地图高度"));
var sudu = parseInt(prompt("请输入蛇的速度(越大越慢)"));
//创建地图
function Map(){
//属性
this.width = kuang;
this.height = gao;
this.backgroundColor = 'gray';
this.ditu = null;
//方法
if (!Map.prototype.show) {
Map.prototype.show = function(){
//创建div
var div = document.createElement('div');
//设置样式
div.style.width = this.width + 'px';
div.style.height = this.height + 'px';
div.style.backgroundColor = this.backgroundColor;
//显示在页面
document.body.appendChild(div);
//将地图div 保存到地图对象的属性上
this.ditu = div;
}
}
}
var map = new Map();
map.show();
//创建食物
function Food(map){
//属性
this.width = 20;
this.height = 20;
this.backgroundColor = 'yellow';
this.x = 0;
this.y = 0;
this.position = 'absolute';
this.borderRadius = '50%';
this.shiwu = null;
//方法
if(!Food.prototype.show){
Food.prototype.show = function(){
//判断，显示，刷新
if(!this.shiwu){
//创建div
var div = document.createElement('div');
div.style.width = this.width + 'px';
div.style.height = this.height + 'px';
div.style.backgroundColor = this.backgroundColor;
div.style.borderRadius = this.borderRadius;
div.style.position = this.position;
//显示到界面
map.ditu.appendChild(div);
this.shiwu = div;
}
//位置
//横/纵坐标 = 0~30随机数 * 地图宽/食物宽（食物宽20）
this.x = Math.floor(Math.random() * (map.width / this.width));
this.y = Math.floor(Math.random() * (map.height / this.height));
//根据坐标，显示食物位置
this.shiwu.style.left = this.x * this.width + 'px';
this.shiwu.style.top = this.y * this.height + 'px';
}
}
}
//输出
var food = new Food(map);
food.show();
//创建蛇
function Snake(){
//属性
this.width = 20;
this.height = 20;
this.position = 'absolute';
this.direction = 'right';
this.borderRadius = '50%';
//是否可以改变方向
this.canChange = false;
//身体
//[[x, y, 颜色, div]]
this.body = [[5, 5, 'red', null], [4, 5, 'blue', null], [3, 5, 'blue', null]];
//方法
//判断，显示，移动
if(!Snake.prototype.show){
Snake.prototype.show = function(){
//创建每节身体div
for (var i = 0; i < this.body.length; i++) {
//每节身体,判断是否创建过
if (!this.body[i][3]) {
//公共样式
var div =document.createElement('div');
div.style.width = this.width + 'px';
div.style.height = this.height + 'px';
div.style.position = this.position;
//显示
map.ditu.appendChild(div);
this.body[i][3] = div;
}
//不同样式
this.body[i][3].style.backgroundColor = this.body[i][2];
this.body[i][3].style.left = this.body[i][0] * this.width + 'px';
this.body[i][3].style.top = this.body[i][1] * this.height+ 'px';
this.body[i][3].style.borderRadius = '5px';
this.body[0][3].style.borderRadius = this.borderRadius;
}
//显示完成，可以修改方向
this.canChange = true;
}
//移动
//最后一节坐标变成前一节坐标
Snake.prototype.move = function(){
//循环,修改每节坐标
for (var i = this.body.length - 1; i > 0; i--) {
//x = x-1 y = y-1
this.body[i][0] = this.body[i-1][0];
this.body[i][1] = this.body[i-1][1];
}
//蛇头控制方向
if (this.direction == 'right') {
//x + 1
this.body[0][0] += 1;
}else if(this.direction == 'left') {
//x - 1
this.body[0][0] -= 1;
}else if(this.direction == 'up') {
//y - 1
this.body[0][1] -= 1;
}else if(this.direction == 'down') {
//y + 1
this.body[0][1] += 1;
}
//判断边界
if (this.body[0][0] < 0 || this.body[0][0] > (map.width / this.width) - 1 || this.body[0][1] < 0 || this.body[0][1] > (map.height / this.height) - 1) {
//游戏结束
clearInterval(timer);
alert('游戏结束');
return;
}
//判断 蛇头和其他身体坐标重合
for (var i = 1; i < this.body.length; i++) {
if (this.body[0][0] == this.body[i][0] && this.body[0][1] == this.body[i][1]) {
//重合，停止
clearInterval(timer);
alert('游戏结束');
return;
}
}
//重新显示
this.show();
//判断 是否吃到食物 蛇头坐标和食物坐标一样
if (this.body[0][0] == food.x && this.body[0][1] == food.y) {
//分数
var score = document.getElementById('fen');
var sc = parseInt(score.value)+1;
score.value = sc;
//吃到 this.body加长一节
this.body[this.body.length] = [0, 0, 'blue', null];
//食物刷新
food.show();
//吃到食物，加速
if(t>150){
t -= 10;
setTimer();
}
}
}
}
}
//输出蛇
var snake = new Snake;
snake.show();
//绑定键盘
window.onkeyup = function(e){
var evt = e || window.event;
if (!snake.canChange) {
return;
}
//左 37 上 38 右 39 下 40
if (e.keyCode == 37 && snake.direction != 'right') {
snake.direction = 'left'
}else if(e.keyCode == 38 && snake.direction != 'down') {
snake.direction = 'up'
}else if(e.keyCode == 39 && snake.direction != 'left') {
snake.direction = 'right'
}else if(e.keyCode == 40 && snake.direction != 'up') {
snake.direction = 'down'
}
snake.canChange =false;
};
//定时器 自动移动
var t = sudu;
var timer;
function setTimer(){
//先停止
clearInterval(timer);
//重新设置
timer = setInterval(function(){
snake.move();
}, t);
}
setTimer();
</script>
</body>
</html>