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<!DOCTYPE html>
<html>
<head>
<title>2048</title>
<meta charset="utf-8"/>
<style>
#gridPanel{
width:480px; height:480px;
margin:0 auto;
background-color:#bbada0;
border-radius:10px;
position:relative;
}
.grid,.cell{
width:100px; height:100px;
border-radius:6px;
}
.grid{
float:left;
margin:16px 0 0 16px;
background-color:#ccc0b3;
}
.cell{
text-align:center;
line-height:100px;
color:#776e65;
font-size:60px;
position:absolute;
}
/*每行擁有相同的top*/
/*每列擁有相同的left*/
#c00,#c01,#c02,#c03{top:16px; }
#c00,#c10,#c20,#c30{left:16px; }
#c10,#c11,#c12,#c13{top:132px; }
#c01,#c11,#c21,#c31{left:132px;}
#c20,#c21,#c22,#c23{top:248px; }
#c02,#c12,#c22,#c32{left:248px;}
#c30,#c31,#c32,#c33{top:364px; }
#c03,#c13,#c23,#c33{left:364px;}
.n2{background-color:#eee3da}
.n4{background-color:#ede0c8}
.n8{background-color:#f2b179}
.n16{background-color:#f59563}
.n32{background-color:#f67c5f}
.n64{background-color:#f65e3b}
.n128{background-color:#edcf72}
.n256{background-color:#edcc61}
.n512{background-color:#9c0}
.n1024{background-color:#33b5e5}
.n2048{background-color:#09c}
.n4096{background-color:#a6c}
.n8192{background-color:#93c}
.n8,.n16,.n32,.n64,.n128,.n256,.n512,.n1024,.n2048,.n4096,.n8192{color:#fff}
.n1024,.n2048,.n4096,.n8192{font-size:40px}
/*顯示分數的p元素*/
p{width:480px; margin:0 auto;
font-family:Arial; font-weight:bold;
font-size:40px; padding-top:15px;
}
/*GameOver界面樣式*/
#gameOver{display:none;
width:100%; height:100%;
position:absolute; top:0px; left:0px;
}
#gameOver div{width:100%; height:100%;
background-color:#555; opacity:0.5;
}
#gameOver p{border-radius:10px;
position:absolute;top:200px;left:35%;
width:300px; height:200px;
border:1px solid #edcf72;
line-height:1.6em;
text-align:center;
background-color:#fff;
}
.button{padding:10px; border-radius:6px;
background-color:#9f8b77;
color:#fff; cursor:pointer;
}
</style>
<script>
function Task(obj,topStep,leftStep){
this.obj=obj;
this.topStep=topStep;
this.leftStep=leftStep;
}
//moveStep方法將當前元素對象移動一步
Task.prototype.moveStep=function(){
var style=getComputedStyle(this.obj,null);
var top=parseInt(style.top);
var left=parseInt(style.left);
this.obj.style.top=top+this.topStep+"px";
this.obj.style.left=left+this.leftStep+"px";
}
//清楚元素對象的樣式，使其返回原地
Task.prototype.clear=function(){
this.obj.style.left="";
this.obj.style.top="";
}
var animation={
times:10,//每個動畫10步完成
interval:10,//200毫秒邁一步
timer:null,//保存定時器id的屬性
tasks:[],//保存每次需要移動的任務
addTask:function(source,target){
//00 02
console.log(source+","+target);
var sourceDiv=
document.getElementById("c"+source);
var targetDiv=
document.getElementById("c"+target);
var sourceStyle=getComputedStyle(sourceDiv);
var targetStyle=getComputedStyle(targetDiv);
var topStep=(parseInt(targetStyle.top)-
parseInt(sourceStyle.top))/this.times;
var leftStep=(parseInt(targetStyle.left)-
parseInt(sourceStyle.left))/this.times;
var task=new Task(sourceDiv,topStep,leftStep);
this.tasks.push(task);
},
start:function(){
this.timer=setInterval(function(){
for(var i=0;i<animation.tasks.length;i++){
animation.tasks[i].moveStep();
}
animation.times--;
if(animation.times==0){
for(var i=0;i<animation.tasks.length;i++){
animation.tasks[i].clear();
}
clearInterval(animation.timer);
animation.timer=null;
animation.tasks=[];
animation.times=10;
}
},this.interval);
}
}
</script>
<script>
var game={
data:[],
score:0,
state:1,
RUNNING:1,
GAME_OVER:0,
PLAYING:2,//動畫正在播放中
start:function(){
this.data=[[0,0,0,0],[0,0,0,0],
[0,0,0,0],[0,0,0,0]];
this.score=0;
this.state=this.RUNNING;
var div=document.getElementById("gameOver");
//修改div的style.display
div.style.display="none";
this.randomNum(); this.randomNum();
this.updateView();
},
isFull:function(){
for(var row=0;row<4;row++){
for(var col=0;col<4;col++){
if(this.data[row][col]==0){
return false;
}
}
}
return true;
},
randomNum:function(){
if(this.isFull()){ return; }
while(true){
var row=Math.floor(Math.random()*4);
var col=Math.floor(Math.random()*4);
if(this.data[row][col]==0){
this.data[row][col]=
Math.random()<0.5?2:4;
break;
}
}
},
canLeft:function(){
//遍歷每個元素(最左側列除外)
for(var row=0;row<4;row++){
for(var col=1;col<4;col++){
// 只要發現任意元素左側值==0或
// 當前值==左側值
if(this.data[row][col]!=0){
if(this.data[row][col-1]==0||
this.data[row][col-1]==this.data[row][col]){
return true;
}
}
}
}//如果循環正常結束，
return false;
},
moveLeft:function(){
if(this.canLeft()){//先判斷能否左移
for(var row=0;row<4;row++){
this.moveLeftInRow(row);
}
this.state=this.PLAYING;
animation.start();
setTimeout(function(){
game.state=game.RUNNING;
game.randomNum();
game.updateView();
},animation.times*animation.interval);
}
},
moveLeftInRow:function(row){
for(var col=0;col<=2;col++){
var nextCol=this.getNextRight(row,col);
if(nextCol==-1){ break;
}else{
if(this.data[row][col]==0){
this.data[row][col]=
this.data[row][nextCol];
this.data[row][nextCol]=0;
animation.addTask(""+row+nextCol,""+row+col);
col--;
}else if(this.data[row][col]
==this.data[row][nextCol]){
this.data[row][col]*=2;
this.score+=this.data[row][col];
this.data[row][nextCol]=0;
animation.addTask(""+row+nextCol,""+row+col);
}
}
}
},
getNextRight:function(row,col){
for(var i=col+1;i<4;i++){
if(this.data[row][i]!=0){
return i;
}
}
return -1;
},
/*將游戲數據整體更新到頁面上*/
updateView:function(){
//Step1：遍歷二維數組中每個元素
for(var row=0;row<4;row++){
for(var col=0;col<4;col++){
//Step2：找到和當前元素對應的div
// 拼div的id: c+row+col
var div=document.getElementById("c"+row+col);
//Step3：將當前元素的值放入div中
// div.innerHTML=?
// 如果當前值==0，放入""
// 否則放入當前值
div.innerHTML=this.data[row][col]==0?"":
this.data[row][col];
//Step4: 根據當前元素值修改div樣式類
// div.className="類名";
// 如果當前值==0,className="cell"
// 否則className="cell n"+當前值
div.className=this.data[row][col]==0?"cell":
"cell n"+this.data[row][col];
}
}
/*將分數放入span*/
var span=document.getElementById("score");
span.innerHTML=this.score;
/*判斷游戲結束*/
if(this.isGameOver()){
this.state=this.GAME_OVER;
//顯示游戲結束div
//找到gameOverdiv
var div=document.getElementById("gameOver");
var finalScore=
document.getElementById("finalScore");
finalScore.innerHTML=this.score;
//顯示div
div.style.display="block";
}
},
canRight:function(){/*判斷能否右移*/
for(var row=0;row<4;row++){
for(var col=0;col<3;col++){
if(this.data[row][col]!=0){
if(this.data[row][col+1]==0||
this.data[row][col]==this.data[row][col+1]){
return true;
}
}
}
}return false;
},
moveRight:function(){/*向右移動所有行*/
if(this.canRight()){
for(var row=0;row<4;row++){
this.moveRightInRow(row);
}
this.state=this.PLAYING;
animation.start();
setTimeout(function(){
game.state=game.RUNNING;
game.randomNum();
game.updateView();
},animation.times*animation.interval);
}
},
moveRightInRow:function(row){/*右移當前行*/
//從右向左遍歷檢查，(最左邊元素除外)
for(var col=3;col>0;col--){
var nextCol=this.getNextLeft(row,col);
if(nextCol==-1){break;
}else{
if(this.data[row][col]==0){
this.data[row][col]=this.data[row][nextCol];
this.data[row][nextCol]=0;
animation.addTask(""+row+nextCol,""+row+col);
col++;
}else if(this.data[row][col]
==this.data[row][nextCol]){
this.data[row][col]*=2;
this.score+=this.data[row][col];
this.data[row][nextCol]=0;
animation.addTask(""+row+nextCol,""+row+col);
}
}
}
},
getNextLeft:function(row,col){
//從當前位置向左，找下一個不為0的數
for(var i=col-1;i>=0;i--){
if(this.data[row][i]!=0){
return i;
}
}return -1;
},
canUp:function(){
for(var row=1;row<4;row++){
for(var col=0;col<4;col++){
if(this.data[row][col]!=0){
if(this.data[row-1][col]==0||
this.data[row][col]==this.data[row-1][col]){
return true;
}
}
}
}return false;
},
moveUp:function(){
if(this.canUp()){
for(var col=0;col<4;col++){
this.moveUpInCol(col);
}
this.state=this.PLAYING;
animation.start();
setTimeout(function(){
game.state=game.RUNNING;
game.randomNum();
game.updateView();
},animation.times*animation.interval);
}
},
moveUpInCol:function(col){
for(var row=0;row<3;row++){
var nextRow=this.getNextDown(row,col);
if(nextRow==-1){ break;
}else{
if(this.data[row][col]==0){
this.data[row][col]=this.data[nextRow][col];
this.data[nextRow][col]=0;
animation.addTask(""+nextRow+col,""+row+col);
row--;
}else if(this.data[row][col]==
this.data[nextRow][col]){
this.data[row][col]*=2;
this.score+=this.data[row][col];
this.data[nextRow][col]=0;
animation.addTask(""+nextRow+col,""+row+col);
}
}
}
},
getNextDown:function(row,col){
for(var i=row+1;i<4;i++){
if(this.data[i][col]!=0){
return i;
}
}return -1;
},
canDown:function(){
for(var row=0;row<3;row++){
for(var col=0;col<4;col++){
if(this.data[row][col]!=0){
if(this.data[row+1][col]==0||
this.data[row][col]==this.data[row+1][col]){
return true;
}
}
}
}return false;
},
moveDown:function(){
if(this.canDown()){
for(var col=0;col<4;col++){
this.moveDownInCol(col);
}
this.state=this.PLAYING;
animation.start();
setTimeout(function(){
game.state=game.RUNNING;
game.randomNum();
game.updateView();
},animation.times*animation.interval);
}
},
moveDownInCol:function(col){
for(var row=3;row>0;row--){
var nextRow=this.getNextUp(row,col);
if(nextRow==-1){break;
}else{
if(this.data[row][col]==0){
this.data[row][col]=this.data[nextRow][col];
this.data[nextRow][col]=0;
animation.addTask(""+nextRow+col,""+row+col);
row++;
}else if(this.data[row][col]==
this.data[nextRow][col]){
this.data[row][col]*=2;
this.score+=this.data[row][col];
this.data[nextRow][col]=0;
animation.addTask(""+nextRow+col,""+row+col);
}
}
}
},
getNextUp:function(row,col){
for(var i=row-1;i>=0;i--){
if(this.data[i][col]!=0){
return i;
}
}return -1;
},
isGameOver:function(){/*判斷游戲是否結束*/
for(var row=0;row<4;row++){
for(var col=0;col<4;col++){
if(this.data[row][col]==0){
return false;
}
if(col<3){/*檢查右側相鄰*/
if(this.data[row][col]==this.data[row][col+1]){
return false;
}
}
if(row<3){/*檢查下方相鄰*/
if(this.data[row][col]==this.data[row+1][col]){
return false;
}
}
}
}return true;
}
}
window.onload=function(){
game.start();
document.onkeydown=function(){
if(game.state!=game.PLAYING){
var event=window.event||arguments[0];
if(game.state==game.RUNNING){
if(event.keyCode==37){
game.moveLeft();
}else if(event.keyCode==39){
game.moveRight();
}else if(event.keyCode==38){
game.moveUp();
}else if(event.keyCode==40){
game.moveDown();
}
}else if(event.keyCode==13){
game.start();
}
}
}
}
</script>
</head>
<body>
<p>Score:<span id="score"></span></p>
<div id="gridPanel">
<!--背景單元格-->
<div id="g00" class="grid"></div>
<div id="g01" class="grid"></div>
<div id="g02" class="grid"></div>
<div id="g03" class="grid"></div>
<div id="g10" class="grid"></div>
<div id="g11" class="grid"></div>
<div id="g12" class="grid"></div>
<div id="g13" class="grid"></div>
<div id="g20" class="grid"></div>
<div id="g21" class="grid"></div>
<div id="g22" class="grid"></div>
<div id="g23" class="grid"></div>
<div id="g30" class="grid"></div>
<div id="g31" class="grid"></div>
<div id="g32" class="grid"></div>
<div id="g33" class="grid"></div>
<!--前景單元格-->
<div id="c00" class="cell"></div>
<div id="c01" class="cell"></div>
<div id="c02" class="cell"></div>
<div id="c03" class="cell"></div>
<div id="c10" class="cell"></div>
<div id="c11" class="cell"></div>
<div id="c12" class="cell"></div>
<div id="c13" class="cell"></div>
<div id="c20" class="cell"></div>
<div id="c21" class="cell"></div>
<div id="c22" class="cell"></div>
<div id="c23" class="cell"></div>
<div id="c30" class="cell"></div>
<div id="c31" class="cell"></div>
<div id="c32" class="cell"></div>
<div id="c33" class="cell"></div>
</div>
<!--Game Over界面-->
<div id="gameOver">
<div><!--灰色半透明背景--></div>
<!--前景小窗-->
<p>Game Over!<br>
Score:<span id="finalScore"></span><br>
<a class="button" id="restart" onclick="game.start()">Try again!</a>
</p>
</div>
</body>
</html>
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