基于JS制作一个简易的2048游戏
作者：巨輪
这篇文章主要介绍了如何利用JS编写一个简单的2048小游戏,代码简单易懂对大家的学习或工作具有一定的参考借鉴价值，需要的朋友可以参考下
效果图
实现代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>2048</title>
<style type="text/css">
.basic{
height:80px;
width:80px;
background-color:#DBDBDB;
float:left;
margin:2px;
}
.row{
height:80px;
clear:both;
}
</style>
</head>
<body>
<div id="pool"></div>
<div id="sample" class="basic" style='opacity: 0;'></div>
<div>score:<span id='score' style="font-size:200%;font-weight:bold;"></span></div>
<script type="text/javascript" >
//对象内使用，要加this
var container={
rowNum:4,
colNum:4,
score:0,//靠弄个Cookie记录下游戏记录
isMoved:false,//Block 有没有移动过
content:[],//{x:col,y:row,v:value}
colour:['#DBDBDB','#56A36C','#EFCEE8',
'#81C2D6','#8192D6','#D9B3E6',
'#DCF7A1','#83FCD8','#E8F2FF',
'#91C6FF','#B8F788','#58D2E8',
'#F2B6B6','#E8ED51','#FFE3FB',
'#E8FF8C','#FFDEC9','#F5A433',
'#E6109B','#96C4E6','#E560CD'],
colourObject:{},
//初始化 背景
loadBackground:function(){
var pool = document.getElementById("pool");
var sample = document.getElementById("sample")
var margin = 2;
var dotWidth = parseFloat(sample.offsetWidth) + margin;//基本方块宽度 + margin
for(var i = 0; i != this.rowNum; i++){
//创建行
var rDiv = document.createElement("div");
rDiv.setAttribute('id','r' + i);
rDiv.setAttribute('class','row');
for(var j = 0; j != this.colNum; j++){
var cDiv = document.createElement("div");
cDiv.setAttribute('id','c'+j + '_r' + i);
cDiv.setAttribute('class','basic');
rDiv.appendChild(cDiv);
}
rDiv.setAttribute('width',(this.colNum * (dotWidth + margin)) + 'px')
pool.appendChild(rDiv);
}
},
findBlock:function(colx, rowy){
return this.content.find(function(value){
return value.x == colx && value.y == rowy;
});
},
addBlockToMine:function(){//开局或移动后,添加新块
var zeroBlockArray = this.content.filter(function(value){
return value.v == 0;
});
if(zeroBlockArray.length != 0){
zeroBlockArray[this.makeRandomInteger(zeroBlockArray.length)].v =
(this.makeRandomInteger(2) + 1) * 2;
}
},
makeRandomInteger:function(scope){
return Math.floor(Math.random() * scope);
},
checkDeath:function(){
if(this.content.filter(function(value){
return value.v == 0;
}).length != 0){
return false;//有零块就表示没有死
}else{
//满格时，检测相邻之间可合并的可能性//Jallen Kwong
//再没有合并的可能，没有的话，游戏就结束
//穷举法(不聪明的方法)
for(var i = 0; i < this.rowNum; i++){
if(i != this.rowNum - 1){
for(var j = 0;j < this.colNum; j++){
var mainBlock = this.findBlock(j, i);
var downBlock = this.findBlock(j, i + 1);
if(j != this.colNum - 1){
var rightBlock = this.findBlock(j + 1,i);
if(mainBlock.v == rightBlock.v
|| mainBlock.v == downBlock.v){
return false;
}
}else{
if(mainBlock.v == downBlock.v){
return false;
}
}
}
}else{
for(var j = 0;j < this.colNum - 1; j++){
var mainBlock = this.findBlock(j, i);
var rightBlock = this.findBlock(j + 1, i);
if(mainBlock.v == rightBlock.v){
return false;
}
}
}
}
return true;//真的Game Over
}
},
refresh:function(){//刷新显示页面
for(var row = 0;row < this.rowNum;row++){
for(var col = 0;col < this.colNum;col++){
var value = this.findBlock(col,row).v;
var elem = document.getElementById('c'+col+'_r'+row);
elem.style.backgroundColor = this.colourObject[value] == undefined?this.colourObject[0]:this.colourObject[value];
elem.innerHTML
= (value == 0 ? "" : "<span style='font-size:200%;font-weight:bold;'>"+value+"</span>");
}
}
document.getElementById('score').innerHTML = this.score;
},
addKeyListener:function(event){
var keycode = event.keyCode;
if(keycode >= 37 && keycode <= 40){
//alert(keycode);
event.preventDefault();
var changeCount = 0;//记住块有没真正得移动过
switch(keycode){
case 37://左
//console.log(keycode);
for(var i = 0; i < this.rowNum; i++){
var queue = [];
var flag = false;
//入栈
for(var j = 0 ; j < this.colNum; j++){
var block = this.findBlock(j, i);
if(block.v == 0){
continue;
}
flag = this.coreCalculate(block, queue, flag);
}
//出队列
for(var k = 0 ;k < this.colNum; k++){
changeCount += this.outOfQueue(k, i, queue, k);
}
}
break;
case 38://上
for(var i = 0; i < this.colNum; i++){
var queue = [];
var flag = false;
for(var j = 0 ;j < this.rowNum; j++){
var block = this.findBlock(i, j);
if(block.v == 0){
continue;
}
flag = this.coreCalculate(block, queue, flag);
}
//出队列
for(var k = 0 ;k < this.rowNum; k++){
changeCount += this.outOfQueue(i, k, queue, k);
}
}
break;
case 39://右
for(var i = 0; i < this.rowNum; i++){
var queue = [];
var flag = false;
//入栈
for(var j = this.colNum - 1 ; j >= 0; j--){
var block = this.findBlock(j, i);
if(block.v == 0){
continue;
}
flag = this.coreCalculate(block, queue, flag);
}
//console.log(queue);
//出队列
for(var k = this.colNum - 1 ,l = 0;k >= 0; k--,l++){
changeCount += this.outOfQueue(k, i, queue, l);
}
}
break;
case 40://下
for(var i = 0; i < this.colNum; i++){
var queue = [];
var flag = false;
for(var j = this.rowNum - 1 ;j >= 0; j--){
var block = this.findBlock(i, j);
if(block.v == 0){
continue;
}
flag = this.coreCalculate(block, queue, flag);
}
//出队列
for(var k = this.rowNum - 1 ,l = 0;k >= 0; k--,l++){
changeCount += this.outOfQueue(i, k, queue, l);
}
}
break;
default:break;
}
//要检查content的v们有没有改变过
//1.入栈操作前，要来个数组拷贝，然后在做比对，这做法并不聪明
//2.出队列的时候，跟原来的值进行比较，有改变 changCount++
//console.log('changeCount:' + changeCount);
if(changeCount != 0){
this.addBlockToMine();
this.refresh();//刷新显示页面
if(this.checkDeath()){
alert("Game Over!");
document.onkeydown = function(event){
var keycode = event.keyCode;
if(keycode >= 37 && keycode <= 40){
event.preventDefault();
alert("Game Over!");
}
};
}
}
}
},
init:function(){
for(var row = 0; row < this.rowNum; row++){
for(var col = 0; col < this.colNum; col++){
this.content[this.content.length] = {x:col,y:row,v:0};
}
}
for(var i = 0;i <= 20;i++){
if(i == 0){
this.colourObject[i] = this.colour[i];
continue;
}
this.colourObject[Math.pow(2,i)] = this.colour[i];
}
//console.log(this.colourObject[7]);
},
coreCalculate:function(block, queue, flag){ flag的作用，入栈方式有问题，譬如2,2,4 应得 4,4 但结果 得8
if(queue.length == 0 ){
queue[queue.length] = block.v;
return flag;
}else{
var tailOfQueue = queue[queue.length - 1];
if((tailOfQueue == block.v) && !flag){
this.score += (queue[queue.length - 1] = tailOfQueue * 2);
return true;
}else{
queue[queue.length] = block.v;
return false;
}
}
},
outOfQueue:function(colx, rowy, queue, index){
var block = this.findBlock(colx, rowy);
var oldValue = block.v;
block.v = queue[index] == undefined ? 0 : queue[index];
return oldValue != block.v? 1 : 0;
}
};
//main
window.onload = function(){
container.loadBackground();
container.init();
//alert(container.findBlock(1,1).v);
container.addBlockToMine();
container.addBlockToMine();
container.refresh();
document.addEventListener('keydown', function(event){
container.addKeyListener(event);
});
};
</script>
</body>
</html>
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