施用js实现贪食蛇游戏 _JavaScript

使用js实现贪食蛇游戏

1、游戏说明

1) 用户可自定义贪食蛇行走速度（数字越大速度越快）及阻挡物个数（随机生成）。

2) 按“回车键”或“开始游戏”按钮开始游戏。

3) 按“方向键”控制贪食蛇行走方向。

4) 按“空格”或“开始/暂停游戏”按钮开始/暂停游戏。

2、效果图

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3、html页面

<!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=utf-8" />
<title>贪食蛇</title>
<link href="css/snake.css" rel="stylesheet"  />
<script type="text/javascript" src="js/jquery-1.6.2.min.js"></script>
<script type="text/javascript" src="js/snake.js"></script>
</head>

<body>
<div class="operate">
	<div id="start">
        贪食蛇速度：
        <select id="speed" style="width:100px;">
        	<option value="10" >1</option>
        	<option value="8" >2</option>
        	<option value="6" selected="selected" >3</option>
        	<option value="4" >4</option>
        	<option value="2" >5</option>
        </select>
        <br /><br />
        阻挡物个数：<input type="text" value="5" id="wall" style="width:100px;" />
        <br /><br />
        <input type="button" onclick="startGame();" value="开始游戏" />
    </div>
    <div id="restart" style="display:none;">
		<input type="button" id="pause" onclick="pauseGame();" value="暂停游戏" />
		<input type="button" onclick="restartGame();" value="重新开始" />
    </div>
    <div id="result"></div>
    <div class="tip">
   		<hr />
    	<ul>
        	<li><div class="tip_color" style="background:red;"></div><span class="tip_font">蛇头</span></li>
        	<li><div class="tip_color" style="background:green;"></div><span class="tip_font">蛇体</span></li>
        	<li><div class="tip_color" style="background:#660000;"></div><span class="tip_font">食物</span></li>
        	<li><div class="tip_color" style="background:#6699FF;"></div><span class="tip_font">阻挡物</span></li>
            <br /><br />
        	<li><span class="tip_short"><b>游戏操作说明：</b></span></li>
        	<li><span class="tip_short">1.用户可自定义贪食蛇行走速度（数字越大速度越快）及阻挡物个数（随机生成）。</span></li>
        	<li><span class="tip_short">2.按“回车键”或“开始游戏”按钮开始游戏。</span></li>
        	<li><span class="tip_short">3.按“方向键”控制贪食蛇行走方向。</span></li>
            <li><span class="tip_short">4.按“空格”或“开始/暂停游戏”按钮开始/暂停游戏。</span></li>
        </ul>
    </div>
</div>
</body>
</html>

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4、js

// 游戏名称：贪食蛇
// 作者：Sailqi
// 版本：1.0
// 日期：2011-09-22

var ground_rows = 60;//场地行数
var ground_columns = 60;//场地列数
var ground_width = 600;//场地宽度
var ground_height = 600;//场地高度

var x_step = ground_width / ground_columns;
var y_step = ground_height / ground_rows;

var points = new Array();//各点坐标数组
var snake = new Array();//贪食蛇各点数据
var refreshTimer = 200;//贪食蛇速度

var snakeHeadColor = "red";//蛇头颜色
var snakeColor = "green";//贪食蛇颜色
var foodColor = "#660000";//食物颜色
var wallColor = "#6699FF";//墙壁颜色

var groundObj;//场地JQuery对象

//行走方向 1左 2上 3右 4下
var direction = 3;
var pre_direction = direction;

var isStart = false;
var isPause = false;

//方块信息对象
function point(row, column, id, type){
	this.row = row;
	this.column = column;
	this.id = id;
	this.type = type;//1空方块，2墙，3蛇体，4食物
}

$(document).ready(function(){
	document.onkeydown = keydown;
	init();
});

//开始游戏
function startGame(){
	
	//生成食物
	groundObj.append(createRandomBlock(4));
	
	//生成初始化贪食蛇
	var snakeP;
	snakeP = points[1][1];
	snakeP.type = 3;
	snake.push(snakeP);
	groundObj.append(createBlock(snakeP));
	
	//速度
	refreshTimer = parseInt($("#speed").val()) * 50;
	//阻挡物
	var wallNum = parseInt($("#wall").val());
	for(k = 0; k < wallNum; k++){
		groundObj.append(createRandomBlock(2));
	}
	
	isStart = true;
	
	$("#start").hide();
	$("#restart").show();
	
	timer();
}

//重新开始
function restartGame(){
	location.reload();
}
//暂停/继续游戏
function pauseGame(){
	isPause = !isPause;
	if(isPause){
		$("#pause").val("继续游戏");
	} else{
		$("#pause").val("暂停游戏");
	}
}

//初始化数据、界面
function init(){
	$("body").append('<div id="ground" style="width:' + ground_width + 'px;height:' + ground_height + 'px;"></div>');
	groundObj = $("#ground");
	
	//场地各点坐标
	var max_x = ground_columns + 1;
	var max_y = ground_rows + 1;
	for(i = 0; i <= max_x; i++){
		points[i] = new Array();
		for(j = 0; j <= max_y; j++){
			if( i == 0 || i == max_x || j == 0 || j == max_y){//四周围墙
				points[i][j] = new point(i, j, "point" + i + "_" + j, 2);
				groundObj.append(createBlock(points[i][j]));
			} else{
				points[i][j] = new point(i, j, "point" + i + "_" + j, 1);
			}
		}
	}
	
}

//创建实际方块
//p 方块信息
function createBlock(p){
	var blockColor = "";
	if(p.type == 2){//墙壁
		blockColor = wallColor;
	} else if(p.type == 3){//蛇体
		blockColor = snakeColor;
	} else if(p.type == 4){//食物
		blockColor = foodColor;
	}
	var left = x_step * (p.column - 1);
	var top = y_step * (p.row - 1);
	var blockHtml = '<div id="' + p.id 
					+ '" style="width:' + x_step + 'px;'
					+ 'height:' + y_step + 'px;'
					+ 'background:' + blockColor  + ';'
					+ 'left:' + left + 'px;'
					+ 'top:' + top + 'px;'
					+ '"></div>';
	return blockHtml;
}

//随机生成方块
function createRandomBlock(type){
	var i = Math.floor(Math.random() * ground_columns + 1);
	var j = Math.floor(Math.random() * ground_rows + 1);
	var pt = points[i][j];
	//判断该位置是否已被占用
	if(pt.type != 1)
		return createRandomBlock(type);
	pt.type = type;
	return createBlock(pt);
}

//获取前进方向方块信息
function getBlock(){
	var current = snake[snake.length-1];
	var next;
	var row = 0, column = 0;
	switch(direction){
		case 1://左
			row = current.row;
			column = current.column - 1;
			break;
		case 2://上
			row = current.row - 1;
			column = current.column;
			break;
		case 3://右
			row = current.row;
			column = current.column + 1;
			break;
		case 4://下
			row = current.row + 1;
			column = current.column;
			break;
		default:
			return;
	}
	next = points[row][column];
	return next;
}

//蛇头颜色替换
function changeColor(){
	var snakeLength = snake.length;
	if(snakeLength > 1){
		$("#" + snake[snake.length-2].id).get(0).style.background = snakeColor;
	}
	$("#" + snake[snake.length-1].id).get(0).style.background = snakeHeadColor;
}

//刷新贪食蛇长度、位置
function refreshSnake(next){
	switch(next.type){
		//前面是空方块
		case 1:
			//移除尾部方块
			var tail = snake.shift();
			tail.type = 1;
			$("#" + tail.id).remove();
			//新增头部方块
			next.type = 3;
			snake.push(next);
			groundObj.append(createBlock( next));
			changeColor();
			break;	
		//前面是墙
		case 2:
			isStart = false;
			break;
		//前面是蛇本身
		case 3:
			if(Math.abs(direction - pre_direction) == 2){
				direction = pre_direction;
				break;
			}
			isStart = false;
			break;
		//前面是食物
		case 4:
			//移除食物方块
			$("#" + next.id).remove();
			//新增头部方块
			next.type = 3;
			snake.push(next);
			groundObj.append(createBlock(next));
			//重新生成食物
			groundObj.append(createRandomBlock(4));
			changeColor();
			break;	
	}
}

function showResult(){
	var score = snake.length;
	var result = "游戏结束！<br />您的成绩为：" + snake.length + "分。<br />";
	if(score < 6) result +="等级：差";
	else if(score >= 6 && score < 15) result += "等级：及格";
	else if(score >= 15 && score < 30) result += "等级：良好";
	else if(score >= 30 && score < 40) result += "等级：优秀";
	else if(score >= 40 && score < 50) result += "等级：牛人";
	else if(score >= 50 && score < 60) result += "等级：神人";
	else if(score >=60 && score < 70) result += "等级：立地成佛";
	else if(score >=70) result += "等级：无人能及";
	$("#result").html(result);
}
//定时器
function timer(){
	if(!isPause){
		if(isStart){
			refreshSnake(getBlock());
		} else{
			showResult();
			return;
		}
	}
	setTimeout("timer();", refreshTimer);
}

//监听键盘（方向键）
function keydown(evt)
{
	var evt = evt || event;
	var currKey = evt.keyCode || evt.which || evt.charCode;
	if(currKey == 13 || currKey == 32 || (currKey > 36 && currKey < 41))
	{
		pre_direction = direction;
		switch(currKey)
		{
			//回车键
			case 13:
				if(!isStart){
					startGame();
				}
				break;
			//空格键
			case 32:
				isPause = !isPause;
				break;
			//左方向键
			case 37:
				direction = 1;
				break;
			//上方向键
			case 38:
				direction = 2;
				break;
			//右方向键
			case 39:
				direction = 3;
				break;
			//下方向键
			case 40:
				direction = 4;
				break;
			//其它
			default:
				break;
		};
	}
}

5、css

@charset "utf-8";
/* CSS Document */
div{
	position: absolute;
}
/*场地*/
#ground{
	margin-left: 200px;
	margin-top: 50px;
}

.operate{
	width: 300px;
	height: 600px;
	margin-left: 900px;
	margin-top: 40px;
	border: 1px solid #6699FF;
	padding: 10px 10px 10px 10px;
}
/*用户自定义、控制面板*/
#start, #restart{
	margin-top:20px;
	margin-left: 20px;
}

/*结果显示*/
#result{
	margin-top:100px;
 	color: #FF0000;
	font-size: 20px;
	font-weight: bold;
	text-align: center;
	width:280px;
	height: 100px;
}
/*游戏说明*/
.tip{
	margin-top:200px;
}

.tip ul, .til ul li{
	list-style: none;
	margin-top: 30px;
	padding-left: 20px;
	width:280px;
}
/*方块*/
.tip_color{
	width:15px;
	height:15px;
}

/*方块颜色说明*/
.tip_font{
	width:50px;
	margin-left: 30px;
	overflow: scroll;
}

/*快捷键*/
.tip_short{
	height:20px;
	line-height: 23px;
}

/*水平线*/
hr{
	color: #6699FF;
}

6、源代码已打包，见附件Snake.zip。