<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
.map{
position: relative;
background-color: #666666;
margin: 0 auto;
}
</style>
</head>
<body>
<div class="map" id="map"></div>
<script>
</script>
</body>
</html>
<script>
var speed=0;
var num=prompt("请选择难度：（1/2/3）");
var map=document.getElementById("map");
if(num==1){
map.style.width=400+"px";
map.style.height=300+"px";
speed=200;
}else if (num==2){
map.style.width=600+"px";
map.style.height=500+"px";
speed=150
}else {
map.style.width=800+"px";
map.style.height=700+"px";
speed=100;
}
var map=document.querySelector(".map");
//1.封装食物对象--->函数自调用
((function () {
//存放小方块食物
var elements=[];
//2.写小方块的构造函数--->宽高颜色X\Y轴
function Food(width,height,color,border,x,y) {
this.width=width||20;
this.height=height||20;
this.color=color||"yellow";
this.border=border||50;
this.x=x||0;
this.y=y||0;
this.element=document.createElement("div");
}
Food.prototype.init=function (map) {
var div = this.element;
div.style.width=this.width+"px";
div.style.height=this.height+"px";
div.style.backgroundColor=this.color;
div.style.borderRadius=this.border+"px";
div.style.position="absolute";
//设置随机的横纵坐标
this.x=parseInt(Math.random()*(map.offsetWidth/this.width))*this.width;
this.y=parseInt(Math.random()*(map.offsetHeight/this.height))*this.height;
div.style.left=this.x+"px";
div.style.top=this.y+"px";
//把DIV放到数组里面
elements.push(div);
//把DIV添加到地图当中
map.appendChild(div);
}
window.Food=Food;
})());
((function () {
//存放小蛇
var elements=[];
//写小蛇的构造函数
function Snake(width,height,direction) {
this.width=width||20;
this.height=height||20;
this.direction=direction||2;
this.body=[
{x:3, y:2, color:"green"},
{x:2,y:2,color:"red"},
{x:1,y:2,color:"red"}
]
}
//在原型中显示小蛇-->地图
Snake.prototype.init=function (map) {
remove();
for (var i=0;i<this.body.length;i++){
//存放小蛇的每一个部位
var obj=this.body[i];
//创建一个DIV
var div=document.createElement("div");
//把DIV添加到地图上
map.appendChild(div);
//设置样式
div.style.position="absolute";
div.style.width=this.width+"px";
div.style.height=this.height+"px";
//每个DIV的横纵坐标
div.style.left = this.width*obj.x+"px";
div.style.top = this.height*obj.y+"px";
div.style.backgroundColor=obj.color;
elements.push(div);
}
}
//在原型中移动小蛇-->地图
Snake.prototype.move=function(food,map){
for (var i=this.body.length-1;i>0;i--){
this.body[i].x=this.body[i-1].x;
this.body[i].y=this.body[i-1].y;
}
//设置小蛇的头部
switch (this.direction) {
case 2:
this.body[0].x+=1;
break;
case 0:
this.body[0].x-=1;
break;
case 1:
this.body[0].y-=1;
break;
case 3:
this.body[0].y+=1;
break;
}
//判断方向
//获取蛇头的横纵坐标
var headX=this.body[0].x*this.width;
var headY=this.body[0].y*this.height;
//获取食物的横纵坐标
var foodX = food.x;
var foodY = food.y;
if (headX == foodX && headY == foodY) {
var last=this.body[this.body.length-1];
this.body.push({
x:last.x,
y:last.y,
color:last.color
})
food.init(map);
}
};
//封装删除小蛇的函数
function remove() {
//先删除蛇尾--->遍历数组
for (var i=elements.length-1;i>=0;i--){
//获取对应下标的数组的里面的元素
var ele=elements[i];
//删除地图上的小蛇
ele.parentNode.removeChild(ele);
//删除数组里面的div
elements.splice(i,1);
}
}
//暴露给window
window.Snake=Snake;
})());
//封装游戏函数
((function () {
var that=null;
//游戏的构造函数
function Game(map) {
this.food=new Food();
this.snake=new Snake();
this.map=map;
that=this;
}
//通过原型对象添加方法
Game.prototype.init=function () {
//初始化食物和小蛇
this.food.init(this.map);
this.snake.init(this.map);
//原型可以互相访问
this.runSnake(this.food,this.map);
this.fang();
}
Game.prototype.runSnake = function(food,map){
var t = setInterval(function () {
that.snake.move(this.food,this.map);
that.snake.init(map);
// that.snake.move(map);
// that.snake.init(map);
//获取蛇头坐标
var headX=that.snake.body[0].x;
var headY=that.snake.body[0].y;
//获取地图最大的最大坐标值
var maxX = map.offsetWidth/this.snake.width;
var maxY = map.offsetHeight/this.snake.height;
if (headX<0||headX>maxX){
clearInterval(t);
alert("游戏结束！")
}else if (headY<0||headY>maxY) {
clearInterval(t);
alert("游戏结束！")
}
for (var i = 1;i<that.snake.body.length;i++){
if (headX==that.snake.body[i].x&&headY==that.snake.body[i].y){
alert("游戏结束！");
clearInterval(t);
}
}
}.bind(that),speed);
//判断
};
Game.prototype.fang = function(){
document.addEventListener('keydown',function (e) {
var n=event.keyCode-37;
n=n<4?n:this.snake.direction;
n=n>=0?n:this.snake.direction;
this.snake.direction=Math.abs(this.snake.direction-n)==2?this.snake.direction:n;
}.bind(that))
}
//暴露给window
window.Game=Game;
})());
var game=new Game(document.querySelector('.map'));
game.init();
</script>贪吃蛇案例
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转载自blog.csdn.net/m0_38027483/article/details/81672492
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