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2048 mini-game written using Javascript_javascript skills

WBOY
Release： 2016-05-16 15:30:04
Original
1554 people have browsed it

On a whim recently, the project is over. I use JavaScript to write a small game. Let’s practice it. If the writing is not good, please give me criticism and suggestions.

HTML code is as follows

<!DOCTYPE html>
<html>
 <head>
 <title></title>
 <meta charset="utf-8" />
 <link rel="stylesheet" href="2048.css"/>
 <script src="2048.js"></script>
 <script>
 </script>
 </head>
 <body>
 <p>Score:<span id="score"></span></p>
 <div id="gridPanel">
 <!--背景格-->
 <!--第1行-->
 <div id="g00" class="grid"></div>
 <div id="g01" class="grid"></div>
 <div id="g02" class="grid"></div>
 <div id="g03" class="grid"></div>
 <!--第2行-->
 <div id="g10" class="grid"></div>
 <div id="g11" class="grid"></div>
 <div id="g12" class="grid"></div>
 <div id="g13" class="grid"></div>
 <!--第3行-->
 <div id="g20" class="grid"></div>
 <div id="g21" class="grid"></div>
 <div id="g22" class="grid"></div>
 <div id="g23" class="grid"></div>
 <!--第4行-->
 <div id="g30" class="grid"></div>
 <div id="g31" class="grid"></div>
 <div id="g32" class="grid"></div>
 <div id="g33" class="grid"></div>
 <!--前景格-->
 <!--第1行-->
 <div id="c00" class="cell"></div>
 <div id="c01" class="cell"></div>
 <div id="c02" class="cell"></div>
 <div id="c03" class="cell"></div>
 <!--第2行-->
 <div id="c10" class="cell"></div>
 <div id="c11" class="cell"></div>
 <div id="c12" class="cell"></div>
 <div id="c13" class="cell"></div>
 <!--第3行-->
 <div id="c20" class="cell"></div>
 <div id="c21" class="cell"></div>
 <div id="c22" class="cell"></div>
 <div id="c23" class="cell"></div>
 <!--第4行-->
 <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>
 <div id="gameOver"><!--同时包含前景和背景的容器-->
 <div><!--半透明灰色背景--></div>
 <p><!--居中小窗口-->
  Game Over!<br>
  Score:<span id="finalScore"></span><br>
  <a class="button" onclick="game.start()">Try again!</a>
 </p>
 </div>
 </body>
</html>
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CSS code is as follows

@charset "utf-8";
#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{background-color:#ccc0b3;
 margin:16px 0 0 16px;
 float:left;
}
.cell{
 /*margin:16px 0 0 16px;
 float:left;
 position:relative;
 z-index:10;
 top:-464px;
 left:0;*/
 position:absolute;
 text-align:center;
 line-height:100px;
 font-size:60px;
}
#c00,#c01,#c02,#c03{top:16px;}
#c10,#c11,#c12,#c13{top:132px;}
#c20,#c21,#c22,#c23{top:248px;}
#c30,#c31,#c32,#c33{top:364px;}
#c00,#c10,#c20,#c30{left:16px;}
#c01,#c11,#c21,#c31{left:132px;}
#c02,#c12,#c22,#c32{left:248px;}
#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}
/*分数显示*/
p{width:480px; margin:0 auto;
 font-family:Arial;font-weight:bold;
 font-size:40px; padding-top:15px;
}
/*Game Over*/
#gameOver{width:100%; height:100%;
 position:absolute; top:0; left:0;
 display:none;
}
#gameOver>div{width:100%; height:100%;
 background-color:#555; opacity:.5;
}
#gameOver>p{width:300px; height:200px;
 border:1px solid #edcf72;
 line-height:1.6em; text-align:center;
 background-color:#fff; border-radius:10px;
 position:absolute; top:50%; left:50%;
 margin-top:-135px; margin-left:-150px;
}
.button{padding:10px; border-radius:6px;
 background-color:#9f8b77; color:#fff;
 cursor:pointer;
}
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The javascript code is as follows

var game={
 data:[],//保存所有数字的二维数组
 rn:4, //总行数
 cn:4, //总列数
 state: 0, //游戏当前状态：Running|GameOver
 RUNNING:1,
 GAMEOVER:0,
 score:0, //分数
 isGameOver:function(){//判断游戏状态为结束
  //如果没有满,则返回false
  if(!this.isFull()){
   return false;
  }else{//否则
   //从左上角第一个元素开始，遍历二维数组
   for(var row=0;row<this.rn;row++){
    for(var col=0;col<this.cn;col++){
     //如果当前元素不是最右侧元素
     if(col<this.cn-1){
     // 如果当前元素==右侧元素
      if(this.data[row][col]==
       this.data[row][col+1]){
       return false;
      }
     }
     //如果当前元素不是最下方元素
     if(row<this.rn-1){
     // 如果当前元素==下方元素
      if(this.data[row][col]==
       this.data[row+1][col]){
       return false;
      }
     }
    }
   }return true;
  }
 },
 start:function(){//游戏开始
  this.state=this.RUNNING;
  //找到游戏结束界面，隐藏
  var div=document.getElementById("gameOver");
  div.style.display="none";
  this.data=[//初始化二维数组
   [0,0,0,0],
   [0,0,0,0],
   [0,0,0,0],
   [0,0,0,0]
  ];
  this.score=0; //重置分数为0
  /*for(var r=0;r<this.rn;r++){
   this.data[r]=[];//向空数组中添加每一行数组
   for(var c=0;c<this.cn;c++){
    //向当前空行数组中加默认元素0
    this.data[r][c]=0;
   }
  }*/
  //在两个随机位置生成2或4
  this.randomNum();
  this.randomNum();
  //将数据更新到页面
  this.updateView();
 },
 isFull:function(){//判断当前数组是否已满
for(var row=0;row<this.rn;row++){//遍历二维数组
 for(var col=0;col<this.cn;col++){
  // 只要发现当前元素==0
  if(this.data[row][col]==0){
   return false;
  }
 }
}
  //(如果循环正常退出)
  return true;
 },
 randomNum:function(){//在随机空位置生成一个数
  if(!this.isFull()){//如果*不*满，才{
   while(true){//循环true
    //0-3随机生成一个行号row
    var row=parseInt(Math.random()*this.rn);
    //0-3随机生成一个列号col
    var col=parseInt(Math.random()*this.cn);
    //如果data[row][col]==0
    if(this.data[row][col]==0){
    // Math.random():<0.5 >=0.5
    //     2  4
    // 随机生成一个数<0.5&#63;2:4，
    // 放入data[row][col]
     this.data[row][col]=
        Math.random()<0.5&#63;2:4;
     break;//退出循环 
    }
   }
  }
 },
 updateView:function(){
//将二维数组中每个格的数字放入前景格中
//遍历二维数组中每个元素,比如:row=2,col=3, 16
for(var row=0;row<this.rn;row++){
 for(var col=0;col<this.cn;col++){
  /*网页中一切元素，属性，文字都是对象*/
  var div=document.getElementById("c"+row+col);
           //"c23"
  var curr=this.data[row][col]; //当前元素值
  //修改div开始标签和结束标签之间的内容
  div.innerHTML=curr!=0&#63;curr:"";
  //修改div的class属性
  div.className=curr!=0&#63;"cell n"+curr:"cell"
  // class
 }
}
 var span=document.getElementById("score");
 span.innerHTML=this.score;
 //判断并修改游戏状态为GAMEOVER
 if(this.isGameOver()){
  this.state=this.GAMEOVER;
  var div=document.getElementById("gameOver");
  var span=document.getElementById("finalScore");
  span.innerHTML=this.score;
 //修改div的style属性下的display子属性为"block"
  div.style.display="block";
 }
 },//updateView方法的结束
 /*实现左移*/
 /*找当前位置右侧，*下一个*不为0的数*/
 getRightNext:function(row,col){
  //循环变量:nextc——>指下一个元素的列下标
  //从col+1开始,遍历row行中剩余元素，<cn结束
  for(var nextc=col+1;nextc<this.cn;nextc++){
  // 如果遍历到的元素!=0
   if(this.data[row][nextc]!=0){
  //  就返回nextc
    return nextc;
   }
  }return -1;//(循环正常退出，就)返回-1
 },
 /*判断并左移*指定行*中的每个元素*/
 moveLeftInRow:function(row){
  //col从0开始，遍历row行中的每个元素，<cn-1结束
  for(var col=0;col<this.cn-1;col++){
  // 获得当前元素下一个不为0的元素的下标nextc
   var nextc=this.getRightNext(row,col);
  // 如果nextc==-1，(说明后边没有!=0的元素了)
   if(nextc==-1){
    break;
   }else{// 否则
  //  如果当前位置==0,
    if(this.data[row][col]==0){
  //   将下一个位置的值，当入当前位置
     this.data[row][col]=
      this.data[row][nextc];
  //   下一个位置设置为0
     this.data[row][nextc]=0;
     col--;//让col退一格，重复检查一次
    }else if(this.data[row][col]==
       this.data[row][nextc]){
  //  否则，如果当前位置==nextc的位置
  //   将当前位置*=2;
     this.data[row][col]*=2;
  //   下一个位置设置为0;
     this.data[row][nextc]=0;
  //   将当前位置的值，累加到score上
     this.score+=this.data[row][col];
    }
   }
  }
 },
 /*移动所有行*/
 moveLeft:function(){
  var oldStr=this.data.toString();
  //循环遍历每一行
  for(var row=0;row<this.rn;row++){
  // 调用moveLeftInRow方法，传入当前行号row
   this.moveLeftInRow(row);
  }//(循环结束后)
  var newStr=this.data.toString();
  if(oldStr!=newStr){
   //调用randomNum()，随机生成一个数
   this.randomNum();
   //调用updateView()，更行页面
   this.updateView();
  }
 },
 moveRight:function(){
  var oldStr=this.data.toString();
  for(var row=0;row<this.rn;row++){
   this.moveRightInRow(row);
  }
  var newStr=this.data.toString();
  if(oldStr!=newStr){
   this.randomNum();
   this.updateView();
  }
 },
 /*判断并右移*指定行*中的每个元素*/
 moveRightInRow:function(row){
  //col从cn-1开始，到>0结束
  for(var col=this.cn-1;col>0;col--){
   var nextc=this.getLeftNext(row,col);
   if(nextc==-1){
    break;
   }else{
    if(this.data[row][col]==0){
     this.data[row][col]=
      this.data[row][nextc];
     this.data[row][nextc]=0;
     col++;
    }else if(this.data[row][col]==
       this.data[row][nextc]){
     this.data[row][col]*=2;
     this.data[row][nextc]=0;
     this.score+=this.data[row][col];
    }
   }
  }
 },
 /*找当前位置左侧，下一个不为0的数*/
 getLeftNext:function(row,col){
  //nextc从col-1开始，遍历row行中剩余元素，>=0结束
  for(var nextc=col-1;nextc>=0;nextc--){
   // 遍历过程中，同getRightNext
   if(this.data[row][nextc]!=0){
    return nextc;
   }
  }return -1;
 },
 /*获得任意位置下方不为0的位置*/
 getDownNext:function(row,col){
  //nextr从row+1开始，到<this.rn结束
  for(var nextr=row+1;nextr<this.rn;nextr++){
   if(this.data[nextr][col]!=0){
    return nextr;
   }
  }return -1;
 },
 /*判断并上移*指定列*中的每个元素*/
 moveUpInCol:function(col){
  //row从0开始，到<rn-1，遍历每行元素
  for(var row=0;row<this.rn-1;row++){
  // 先获得当前位置下方不为0的行nextr
   var nextr=this.getDownNext(row,col);
   if(nextr==-1){ break; // 如果nextr==-1
   }else{// 否则
  //  如果当前位置等于0
    if(this.data[row][col]==0){
  //   将当前位置替换为nextr位置的元素
     this.data[row][col]=
       this.data[nextr][col];
  //   将nextr位置设置为0
     this.data[nextr][col]=0;
     row--;//退一行，再循环时保持原位
    }else if(this.data[row][col]==
       this.data[nextr][col]){
    //  否则，如果当前位置等于nextr位置
  //   将当前位置*=2
     this.data[row][col]*=2;
  //   将nextr位置设置为0
     this.data[nextr][col]=0;
  //   将当前位置的值累加到score属性上
     this.score+=this.data[row][col];
    }
   }
  }
 },
 /*上移所有列*/
 moveUp:function(){
  var oldStr=this.data.toString();
  //遍历所有列
for(var col=0;col<this.cn;this.moveUpInCol(col++));
  var newStr=this.data.toString();
  if(oldStr!=newStr){
   this.randomNum();
   this.updateView();
  }
 },
 /*下移所有列*/
 moveDown:function(){
  var oldStr=this.data.toString();
for(var col=0;col<this.cn;this.moveDownInCol(col++));
  var newStr=this.data.toString();
  if(oldStr!=newStr){
   this.randomNum();
   this.updateView();
  }
 },
 moveDownInCol:function(col){
  //row从this.rn-1，到>0结束，row--
  for(var row=this.rn-1;row>0;row--){
   var nextr=this.getUpNext(row,col);
   if(nextr==-1){
    break;
   }else{
    if(this.data[row][col]==0){
     this.data[row][col]=
       this.data[nextr][col];
     this.data[nextr][col]=0;
     row++;
    }else if(this.data[row][col]==
       this.data[nextr][col]){
     this.data[row][col]*=2;
     this.data[nextr][col]=0;
     this.score+=this.data[row][col];
    }
   }
  }
 },
 /*获得任意位置上方不为0的位置*/
 getUpNext:function(row,col){
  for(var nextr=row-1;nextr>=0;nextr--){
   if(this.data[nextr][col]!=0){
    return nextr;
   }
  }return -1;
 }
}
//onload事件：当页面加载*后*自动执行
window.onload=function(){
 game.start();//页面加载后，自动启动游戏
 //当按键盘按键时，触发移动:
 document.onkeydown=function(){
  //获得事件对象中键盘号：2步
  //事件对象：在事件发生时自动创建
  //   封装了事件的信息
  if(game.state==game.RUNNING){
   //Step1: 获得事件对象
   var e=window.event||arguments[0];
     //IE   DOM标准
   //Step2: 获得键盘号:e.keyCode
   if(e.keyCode==37){
    game.moveLeft();
   }else if(e.keyCode==39){
    game.moveRight();
   }else if(e.keyCode==38){
    game.moveUp();
   }else if(e.keyCode==40){
    game.moveDown();
   }
   //如果按左键，调用moveLeft
   //否则如果按右键，调用moveRight
  }
 }
}
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The above code is a 2048 mini-game written in JavaScript. The code is simple and easy to understand and comes with comments. I hope you like it.

Related labels：
javascript2048
source：php.cn
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