300行JS代码，让你重回经典
诺基亚贪吃蛇——我的游戏启蒙 |
儿时的经典游戏，无非俄罗斯方块、贪吃蛇、推箱子，之后才有了智能拼图、麻将、象棋、连连看、消消乐。今天拿出来一款JS贪吃蛇供大家学习、参考。
游戏玩法不多做赘述，可以调整关卡，可以调整爬行速度，祝您游戏愉快。
部分游戏截图：
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<!DOCTYPE html>
<html>
<head>
<title>贪吃蛇</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">.backDiv {
text-align: center;
position:absolute;
top:20px;
left:300px;
width:820px;
height:550px;
}
.display {
position:absolute;
top:0px;
left:685px;
width:180px;
height:510px;
border: 5px solid black;
background-color: #ccffff;
}
#gamePanel table {
border-collapse: collapse;/*合并单元格边框*/
border: 5px solid black;
background-color: #f0f0f0;
}
#gamePanel td {
width:15px;
height:15px;
}
#scoreDiv {
position: absolute;
top: 20px;
left:20px;
text-align: left;
font-size: 20px;
font-weight: bold;
}
#prompt {
position: absolute;
top: 180px;
left: 20px;
text-align: left;
font-weight: bold;
}
#operator {
position: absolute;
top:550px;
left:100px;
}
#result {
position: absolute;
top:200px;
left:220px;
background-color: #00ffff;
font-size: 20px;
font-weight: bold;
text-align: left;
padding: 20px;
}</style>
<script>var snake = [];// 蛇数组
var barrers = [];// 障碍物数组
var game = {sizeX:"30",sizeY:"40",record:"0"};
var appearTime = disappearTime = 0;// 超级食物出现
var superFoodX = superFoodY = null;
var color = 0;// 食物颜色
function init(){
clearTimeout(game.time);
snake = [];
barrers = [];
game.x = 0;game.y = 1;
game.dir = null;
game.direction = "right";
game.rate = null;
game.lengths = 2;// 蛇的长度
game.score = 0;
$("scoreDiv").innerHTML = "得分："+game.score+"<br/><br/>长度："+ game.lengths+"<br/><br/>"+"最高分："+game.record;
$("pass").disabled = false;
$("rate").disabled = false;
$("start").disabled = false;
bord();// 设置界面
barrer();// 设置障碍物
$("result").style.visibility = "hidden";
snake.push("tb_" + game.x + "_" + (game.y-1));
snake.push("tb_" + game.x + "_" + game.y);// 蛇头
}
function $(id){
return document.getElementById(id);
}
// 表格
function bord(){
var panel = [];// 游戏面板
var proPanel = [];// 提示面板
panel.push("<table>");
for(var i=0; i<game.sizeX; i++){
panel.push("<tr>");
for(var j=0; j<game.sizeY; j++){
panel.push('<td id="tb_' + i + "_" + j + '" > </td>');
}
panel.push("</tr>");
}
panel.push("</table>");
$("gamePanel").innerHTML = panel.join("");
proPanel.push("<table>");
proPanel.push('<tr>'+'<td width="20px" height="20px" bgcolor="#ff3300"></td>' + '<td> 得分+10</td>'+'</tr>');
proPanel.push('<tr>'+'<td width="20px" height="20px" bgcolor="#33cc33"></td>' + '<td> 得分+30</td>'+'</tr>');
proPanel.push('<tr>'+'<td width="20px" height="20px" bgcolor="#99ff66"></td>' + '<td> 得分+50</td>'+'</tr>');
proPanel.push('<tr>'+'<td width="20px" height="20px" bgcolor="#ffff00"></td>' + '<td> 得分+100</td>'+'</tr>');
proPanel.push('<tr>'+'<td width="20px" height="20px" bgcolor="#006600"></td>' + '<td> 得分-30</td>'+'</tr>');
proPanel.push('<tr>'+'<td width="20px" height="20px" bgcolor="#000000"></td>' + '<td> 得分-50</td>');
proPanel.push("</table>");
$("prompt").innerHTML = proPanel.join("");
}
// 关卡障碍物设置
function barrer() {
var passValue = $("pass").value;
for(var i=0; i<barrers.length; i++) {
$(barrers[i]).style.backgroundColor = "";
}
barrers = [];
if(passValue == 2) {
for(var i=8; i<game.sizeX-8; i++) {
barrers.push("tb_" + i + "_" + 10);
barrers.push("tb_" + i + "_" + (game.sizeY-10));
}
}
if(passValue == 3) {
for(var i=8; i<game.sizeY-8; i++) {
barrers.push("tb_" + Math.floor(game.sizeX/2) + "_" + i);
}
for(var i=6; i<game.sizeX-6; i++) {
barrers.push("tb_" + i + "_" + Math.floor(game.sizeY/2));
}
}
if(passValue == 4) {
for(var i=12; i<game.sizeY-11; i++) {
barrers.push("tb_" + Math.floor(game.sizeX/2) + "_" + i);
}
for(var j=6; j<game.sizeX-6; j++) {
barrers.push("tb_" + j + "_" + Math.floor(game.sizeY/2+1));
}
for(var i=6; i<game.sizeX-6; i++) {
if(i < game.sizeX/2) {barrers.push("tb_"+i+"_"+12);}
else{barrers.push("tb_"+i+"_"+(game.sizeY-11));}
}
for(var j=12; j<game.sizeY-11; j++) {
if(j <= game.sizeY/2) {barrers.push("tb_"+(game.sizeX-7)+"_"+j);}
else {barrers.push("tb_"+6+"_"+(j+1));}
}
}
if(passValue == 5) {
for(var i=0; i<14; i++) {
barrers.push("tb_" + 7 + "_" + i);
barrers.push("tb_" + (game.sizeX-8) + "_" + (game.sizeY-i-1));
}
for(var i=15; i<25; i++) {
if(i < 18 || i > 21){
barrers.push("tb_"+10 +"_"+i);
barrers.push("tb_"+(game.sizeX-11)+"_"+i);
}
}
for(var i=0; i<9; i++) {
barrers.push("tb_" + i + "_" + (game.sizeY-13));
barrers.push("tb_" + (game.sizeX-i-1) + "_" + 12);
}
for(var i=11; i<19; i++) {
if(i < 13 || i > 16){
barrers.push("tb_"+i+"_"+15);
barrers.push("tb_"+i+"_"+(game.sizeY-16));
}
}
}
// 设置障碍物颜色
for(var i=0; i<barrers.length; i++) {
$(barrers[i]).style.backgroundColor = "#660033";
}
}
// 开始游戏
function startGame() {
food();
game.start = true;
$("pass").disabled = true;
$("rate").disabled = true;
$("start").disabled = true;
game.rate = $("rate").value;
$(snake[0]).style.backgroundColor = "#0066ff";
$(snake[1]).style.backgroundColor = "blue";
game.time = setTimeout(function(){
snakeMove();
},game.rate);
superFood();
}
// 蛇移动 速度，方向
function snakeMove() {
if(game.direction == "right") {game.y += 1; }// 右移
if(game.direction == "left") {game.y -= 1; }// 左移
if(game.direction == "up") {game.x -= 1; }// 上移
if(game.direction == "down") {game.x += 1; }// 下移
// 判断游戏是否结束
if(result() == true) {
clearTimeout(game.time); clearTimeout(appearTime); clearTimeout(disappearTime);
game.start = false;
var res = "游戏结束!<br/>";
if(game.score > game.record){
res += "恭喜你破纪录啦！<br/>";
$("scoreDiv").innerHTML = "得分：" + game.score + "<br/><br/>最高分：" + game.record;
}
res += "您的得分为：" + game.score + "<br/>长度:"+game.lengths;
$("result").style.visibility = "visible";
$("result").innerHTML = res;
return;
}
if(game.x==game.fx && game.y==game.fy) {eat(1);}
if(game.x==superFoodX && game.y==superFoodY) {eat(2);}
move();
game.time = setTimeout(function() {
snakeMove(game.rate,game.direction);
},game.rate);
}
function move() {
$(snake[0]).style.backgroundColor = "";
// 保留蛇当前的位置
for(var i=1; i<snake.length; i++) {
snake[i-1] = snake[i];
}
snake[snake.length-1] = "tb_" + game.x + "_" + game.y;// 蛇头位置
for(var i=0; i<snake.length-1; i++) {
$(snake[i]).style.backgroundColor = "#0066ff";
}
$(snake[i]).style.backgroundColor = "blue";
}
// 食物 位置随机且不能与蛇位置重复
function food() {
game.fx = Math.floor(Math.random(game.sizeX)*game.sizeX);
game.fy = Math.floor(Math.random(game.sizeY)*game.sizeY);
if($("tb_" + game.fx + "_" + game.fy).style.backgroundColor != "") {food(); }
else {$("tb_" + game.fx + "_" + game.fy).style.backgroundColor = "#ff3300"; }
}
// 超级食物出现
function superFood() {
appearTime = setTimeout(function(){
var n = Math.floor(Math.random(10)*10);
superFoodX = Math.floor(Math.random(game.sizeX)*game.sizeX);
superFoodY = Math.floor(Math.random(game.sizeY)*game.sizeY);
if($("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor != "") {superFood(); }
else{
if(("tb_" + superFoodX + "_" + superFoodY) == ("tb_" + game.fx + "_" + game.fy)){superFood(); return ;}
if(n < 3){$("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor = "#33cc33"; color = 0;}
else if(3 <= n && n < 5){$("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor = "#006600"; color = 1;}
else if(5 <= n && n < 7){$("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor = "#99ff66"; color = 2;}
else if(7 <= n && n < 9){$("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor = "#000000"; color = 3;}
else {$("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor = "#ffff00"; color = 4;}
clearTimeout(disappearTime);
superFood();
// 一定时间后超级食物消失
disappearTime = setTimeout(function(){
$("tb_" + superFoodX + "_" + superFoodY).style.backgroundColor = "";
superFoodX = superFoodY = null;
},game.rate*120-game.rate*50);
}
},game.rate*120);
}
// 蛇吃食物
function eat(ef) {
// 吃普通食物
if(ef == 1) {snake.push("tb_" + game.fx + "_" + game.fy); game.score += 10; food();}
// 吃超级食物
if(ef == 2) {
if(color == 0) {game.score += 30;}
else if(color == 1) {game.score -= 30;}
else if(color == 2) {game.score += 50;}
else if(color == 3) {game.score -= 50;}
else {game.score += 100;}
snake.push("tb_" + superFoodX + "_" + superFoodY);
if(game.score < 0) {game.score = 0;}
clearTimeout(disappearTime);
}
game.lengths += 1;
$("scoreDiv").innerHTML = "得分："+game.score+"<br/><br/>长度："+game.lengths+"<br/><br/>最高分："+game.record;
}
// 游戏结束
function result() {
var next = "tb_" + game.x + "_" + game.y;
if(game.x<0 || game.x>=game.sizeX || game.y<0 || game.y>=game.sizeY) {return true;}
for(var i=0; i<snake.length; i++) {if(next == snake[i]) {return true;}}
for(var i=0; i<barrers.length; i++) {if(next == barrers[i]) {return true;}}
return false;
}
// 键盘控制
function control(v) {
var evt = v;
game.dir = game.direction;
if(37 <= evt.keyCode && evt.keyCode <= 40 && game.start){
if(evt.keyCode == 37){game.dir=="right" ? game.direction = "right":game.direction = "left";}// 左
if(evt.keyCode == 38){game.dir=="down" ? game.direction = "down" : game.direction = "up";}// 上
if(evt.keyCode == 39){game.dir=="left" ? game.direction = "left" : game.direction = "right";}// 右
if(evt.keyCode == 40){game.dir=="up" ? game.direction = "up" : game.direction = "down";}// 下
if(game.dir != game.direction){clearTimeout(game.time); snakeMove(); }
}
}</script>
</head>
<body onload="init();" onkeyup="control(event);" >
<div class="backDiv">
<div class="display">
<div id="scoreDiv">分数：0</div><br/>
<div id="prompt"></div>
</div>
<div id="gamePanel" ></div><br/>
<div id="operator">
选择关卡：<select id="pass" onchange="barrer();">
<option value="1">关卡1</option>
<option value="2">关卡2</option>
<option value="3">关卡3</option>
<option value="4">关卡4</option>
<option value="5">关卡5</option>
</select>
速度：<select id="rate">
<option value="500">慢</option>
<option value="250">中</option>
<option value="100">快</option>
</select>
<input type="button" id="start" value="开始" onclick="startGame();" />
<input type="button" id="resets" value="重玩" onclick="init();" />
</div>
<div id="result"></div>
</div>
</body>
</html>
文章中的主体部分都添加了注释，不懂的地方可以评论在下方，博主常在，欢迎探讨学习，能帮到路过的你，我非常荣幸 |
如果你觉得我的代码还算有趣，在你的学习中能有所帮助，请查看我的置顶文章，我由衷感谢！
