js pushing box game implementation tutorial

This article will explain to you the steps and key points of making a push box game with JS through code analysis. Friends who need it can refer to it and learn it. I hope it can help everyone.

demo：

Step analysis:

The code of this article has been placed on github, and a lot of work has been done in it. Detailed code comments can be copied and run locally to take a look.

1. Rendering map

html structure:

html structure is very simple, just make a bunch of p's to place them The map class is enough. I have initialized 12*9 p here, and the map has a maximum of nine rows of height.
These p's are all the same size, and the only difference in map rendering is the color.

Map function:

 var box=$('.box p'); //地图使用的p集合
 function create(){ //创建地图函数
 box.each(function(index){ //index的数量是固定的，是box p下面p的数量
  // 每次创建地图初始化p
  box.eq(index).removeClass();
 });
 box.each(function(index,element){ //循环整个p的数量 二维数组里数量不够的 默认为空白
 //level为关卡数 根据关卡渲染地图 builder为二维数组，为地图关卡
  if(builder[level][index]){ //过滤0
   box.eq(index).addClass('type'+builder[level][index]);
  }
 });
 box.eq(origin[level]).addClass("pusher"); //推箱人 皮卡丘位置
 }
 //第一关的地图长这样（下面只是栗子，不是代码），0代表不可抵达区域，1代表目标（要被推到的地方），
 //2代表普通路径（可以走的），3代表墙，4代表箱子
 [0,0,0,0,3,3,3,0,0,0,0,0,
 0,0,0,0,3,1,3,0,0,0,0,0,
 0,0,0,0,3,2,3,3,3,3,0,0,
 0,0,3,3,3,4,2,4,1,3,0,0,
 0,0,3,1,2,4,2,3,3,3,0,0,
 0,0,3,3,3,3,4,3,0,0,0,0,
 0,0,0,0,0,3,1,3,0,0,0,0,
 0,0,0,0,0,3,3,3,0,0,0,0]

2. Capture keyboard events to determine whether it can be moved
Use $(document).keydown()jqery event, Capture keyboard events.

Capture keyboard events, up, down, left, and wsad.

 $(document).keydown(function (e) {
 var key=e.which;
 switch(key){
 //col 的值为12，上下移动要12个p为一个周期
 //方向键上或者w
 case 87:
 case 38:
  move(-col);//判断移动函数
 break;
 //方向键下或者s
 case 83:
 case 40:
  move(col);
 break;
 //方向键左或者a
 case 65:
 case 37:
  move(-1);
 break;
 //方向键右或者d
 case 68:
 case 39:
  move(1);
 break;
 }
 setTimeout(win,500); //按键之后调判断是否过关
 });

Determine whether it can be moved.
It is divided into two judgment conditions: one is to push the box, and the other is to move naturally without pushing the box, otherwise Pikachu will not move.

 function move(step){ //是否移动判断
   // 分为两个判断条件一个是推箱子，一个是不推箱子 自然移动。 否则不移动皮卡丘
   //step 上下是12个p一个周期，左右是1个p positin是皮卡丘的原来位置
  var pikaqiu1=box.eq(position);//皮卡丘现在的地方
  var pikaqiu2=box.eq(position+step);//皮卡丘要去的下一个地方
  var pushBox=box.eq(position+step*2);//箱子要去的下一个地方
  if(!pikaqiu2.hasClass('type4')&&( pikaqiu2.hasClass('type1')||pikaqiu2.hasClass('type2'))){ //自然移动
   //判断：如果下一个p的class不包含type4(箱子)，并且 下一个p含有type1(目标位置)，或者type2(普通路径)
   //这一步和下一步判断是否有type4的原因是普通路径会变成有type4的路径，这时候就会出现问题
   pikaqiu1.removeClass("pusher"); //移除当前皮卡丘
   pikaqiu2.addClass("pusher");//移动皮卡丘到下一个位置
   position=position+step;//增加position值
  }
  else if((pikaqiu2.hasClass('type4'))&&(!pushBox.hasClass('type4'))&&(pushBox.hasClass('type1')|| pushBox.hasClass('type2')) ) {
   //推箱子 
   //如果下一个p的class包含type4(箱子)并且 不包含重叠type4(箱子) 并且 包含class type1（目标位置）或者 包含type2(空路)
   pikaqiu2.removeClass('type4');//移除当前箱子
   pikaqiu1.removeClass("pusher");//移除当前皮卡丘
   pushBox.addClass('type4');//移动箱子到下一个位置
   pikaqiu2.addClass("pusher").addClass("type2");//
   //本来是type4 移除之后，这里没有class了，要变成普通路径
   position=position+step;//增加position值 
  }
 }

3. Victory judgment:
This victory judgment must be called every time you move.

function win(){ //胜利条件判断
 if($(".type1.type4").length===goal){ //推的箱子与关卡设置通过箱子的数量对比
  if(level<9) {
   alert("666，挑战下一关吧--OBKoro1");
   level++; //关卡+1
   goal = goalList[level];
   position = origin[level];
   create();
  }else {
   alert("厉害啊 大佬 通关了都");
  }
 }
}

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