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index.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Snake</title>
<meta name="description" content="">
<meta name="keywords" content="">
<link href="" rel="stylesheet">
<style>
* {margin:0; padding:0;}
body {background:; -moz-user-select:none; text-align:center; font-size:12px;}
table {margin:80px auto 10px auto; overflow:hidden; border-collapse:collapse; }
td {width:10px; height:10px; ; background:#000;}
.food{background-color:green;}
.snake{background-color:#fff;}
</style>
</head>
<body>
<div id="map"></div>
<ul>
<li>1.基本实现一个贪吃蛇的游戏</li>
<li>2.方向键可以控制蛇的方向</li>
<li>3.未来还有完善的空间</li>
</ul>
<script>
var $ = {
id: function(id){
return document.getElementById(id);
},
tagName: function(tag, parent){
var parent = parent || document;
return parent.getElementsByTagName(tag);
},
create: function(tag) {
return document.createElement(tag);
}
};
var utils = {
//创建一个二维数组
createArray2: function(row, col){
var arr1 = new Array(row);
for(var i=0;i<col;i++) {
arr1[i] = new Array(col);
}
return arr1;
},
//一定范围内的随机数
random1: function(start, end){
return Math.floor(Math.random()*(end-start))+start
},
//一定范围内随机产生点位
random2: function(x1, y1, x2, y2) {
var x1 = x1 || 0, //开始的x坐标
y1 = y1 || 0, //开始的y坐标
x2 = x2 || 20, //结束的x坐标
y2 = y2 || 20, //结束的y坐标
pointer = [],
x = this.random1(x1,x2),
y = this.random1(y1,y2);
//如果已经有东西了，那么继续随机
if(barrier[x][y]) {
return this.random2(x1, y1, x2, y2);
}
pointer[0] = x;
pointer[1] = y;
return pointer;
},
key:{
"left": 37,
"up": 38,
"right": 39,
"down": 40
}
}
var row = 20,
col = 20,
barrier = utils.createArray2(row, col),
dirKey = utils.key["right"],
mapElems = utils.createArray2(row, col);
//地图类
function sMap(row, col){
this.col = col;
this.row = row;
}
sMap.prototype.create = function(container){
var table = $.create("table");
var tbody = $.create("tbody");
for(var i=0;i<this.row;i++) {
var tr = $.create("tr");
for(var j=0;j<this.col;j++) {
var td = $.create("td");
mapElems[j][i] = tr.appendChild(td)
}
tbody.appendChild(tr);
}
table.appendChild(tbody);
container.appendChild(table);
addBarrier("food");
//console.log(mapElems)
}
function Snake() {
this.snakePointer = []; //储存蛇的每一节坐标
this.speed = 10;//蛇的爬行速度
this.len = 3;//蛇的长度
this.timer = null;
//this.barrier = barrier;
}
//创建蛇
Snake.prototype.create = function(){
var pointer = utils.random2(this.len-1, this.len-1, col/2)//蛇随机出现位置
for(var i=0; i<this.len; i++) {
var x = pointer[0]-i,
y = pointer[1];
this.snakePointer.push([x,y]); //记录蛇的初始位置
barrier[x][y] = "snake";
}
}
//蛇运动
Snake.prototype.walk = function(){
console.log(this.snakePointer)
var _this = this;
if(this.timer) clearInterval(this.timer);
this.timer = setInterval(function(){
_this.step(_this);
}, Math.floor(3000/_this.speed));
}
//蛇行走一步
Snake.prototype.step = function(_this){
var hX = _this.snakePointer[0][0], //蛇头的x坐标
hY = _this.snakePointer[0][1]; //蛇头的Y坐标
switch(dirKey){
case utils.key["left"]:
hX--
break;
case utils.key["up"]:
hY--
break;
case utils.key["right"]:
hX++
break;
case utils.key["down"]:
hY++
break;
}
if(hX>=col || hX<0 || hY>=row || hY<0 || barrier[hX][hY] == "snake") {
clearInterval(_this.timer);
alert("游戏结束！");
}
//吃东西逻辑
if(barrier[hX][hY] == "food") {
barrier[hX][hY] = false;
addBarrier("food")
} else {
//擦除尾部
var lastX = _this.snakePointer[_this.snakePointer.length-1][0],
lastY = _this.snakePointer[_this.snakePointer.length-1][1];
barrier[lastX][lastY] = false;
mapElems[lastX][lastY].className = "";
_this.snakePointer.pop();
}
_this.snakePointer.unshift([hX, hY]);
barrier[hX][hY] = "snake";
mapElems[hX][hY].className = "snake";
_this.len = _this.snakePointer.length;
}
Snake.prototype.start = function(){
this.create();
this.walk();
}
//键盘控制
function keyHandler(e) {
var e = e || window.event;
dirKey = Math.abs(e.keyCode - dirKey ) !=2 && e.keyCode >36 && e.keyCode <41 ? e.keyCode : dirKey; //只能是方向键且不能是反向
return false;
}
//添加障碍(包括食物)
function addBarrier(name){
var pointer = utils.random2();
barrier[pointer[0]][pointer[1]] = name;
mapElems[pointer[0]][pointer[1]].className = name;
}
var map = new sMap(row, col);
var snake = new Snake();
map.create($.id("map"));
snake.start();
document.onkeydown = keyHandler;
</script>
</body>
</html>