JSミニゲーム_JavaScriptスキルでチェスとダークチェスのソースコードを詳しく解説

この記事の例は、JS ミニゲームのチェス ダーク チェスのソース コードを説明しており、参考のために全員と共有されています。詳細は以下の通りです。

ゲームを実行すると、次のようになります:

JavaScript 部分:

/** chinese chess 
*  Author: fdipzone 
*  Date:  2012-06-24 
*  Ver:  1.0 
*/ 
 
var gameimg = ['images/a1.gif','images/a2.gif','images/a3.gif','images/a4.gif','images/a5.gif','images/a6.gif','images/a7.gif','images/b1.gif','images/b2.gif','images/b3.gif','images/b4.gif','images/b5.gif','images/b6.gif','images/b7.gif','images/bg.gif','images/bg_over.gif','images/bg_sel.gif']; 
var chess_obj = new ChessClass(); 
 
window.onload = function(){ 
  $('init_btn').onclick = function(){ 
    chess_obj.init(); 
  } 
  var callback = function(){ 
    chess_obj.init(); 
  } 
  img_preload(gameimg, callback); 
} 
 
// chess class 
function ChessClass(){ 
  this.chess = []; 
  this.boardrows = 4; 
  this.boardcols = 8; 
  this.area = 82; 
  this.player = 1;  // 1:red 2:green 
  this.selected = null;  // selected chess 
  this.chesstype = ['', 'a', 'b']; 
  this.isover = 0; 
} 
 
// init 
ChessClass.prototype.init = function(){ 
  this.reset_grade();  
  this.create_board(); 
  this.create_chess(); 
  this.create_event(); 
  this.player = 1; 
  this.selected = null; 
  this.isover = 0; 
  disp('init_div','hide'); 
} 
 
// create board 
ChessClass.prototype.create_board = function(){ 
  var board = ''; 
  for(var i=0; i<this.boardrows; i++){ 
    for(var j=0; j<this.boardcols; j++){ 
      board = board + '<div id="' + i + '_' + j + '"><img src="images/chessbg.gif" /></div>'; 
    } 
  } 
  $('board').innerHTML = board; 
  $('board').style.width = this.boardcols * (this.area + 2) + 'px'; 
  $('board').style.height = this.boardrows * (this.area + 2) + 'px'; 
} 
 
// create random chess 
ChessClass.prototype.create_chess = function(){ 
  // 32 chesses 
  var chesses = ['a1','b7','a2','b7','a2','b7','a3','b7','a3','b7','a4','b6','a4','b6','a5','b5', 
           'a5','b5','a6','b4','a6','b4','a7','b3','a7','b3','a7','b2','a7','b2','a7','b1']; 
  this.chess = []; 
  while(chesses.length>0){ 
    var rnd = Math.floor(Math.random()*chesses.length); 
    var tmpchess = chesses.splice(rnd, 1).toString(); 
    this.chess.push({'chess':tmpchess, 'type':tmpchess.substr(0,1), 'val':tmpchess.substr(1,1), 'status':0}); 
  } 
} 
 
// create event 
ChessClass.prototype.create_event = function(){ 
  var self = this; 
  var chess_area = $_tag('div', 'board'); 
  for(var i=0; i<chess_area.length; i++){ 
    chess_area[i].onmouseover = function(){ // mouseover 
      if(this.className!='onsel'){ 
        this.className = 'on'; 
      } 
    } 
    chess_area[i].onmouseout = function(){ // mouseout 
      if(this.className!='onsel'){ 
        this.className = ''; 
      } 
    } 
    chess_area[i].onclick = function(){ // onclick 
      self.action(this); 
    } 
  } 
} 
 
// id change index 
ChessClass.prototype.getindex = function(id){ 
  var tid = id.split('_'); 
  return parseInt(tid[0])*this.boardcols + parseInt(tid[1]); 
} 
 
// index change id 
ChessClass.prototype.getid = function(index){ 
  return parseInt(index/this.boardcols) + '_' + parseInt(index%this.boardcols); 
} 
 
// action 
ChessClass.prototype.action = function(o){ 
  if(this.isover==1){ // game over 
    return false; 
  } 
   
  var index = this.getindex(o.id); 
 
  if(this.selected == null){ // 未选过棋子 
    if(this.chess[index]['status'] == 0){  // not opened 
      this.show(index);   
    }else if(this.chess[index]['status'] == 1){ // opened 
      if(this.chess[index]['type'] == this.chesstype[this.player]){ 
        this.select(index); 
      } 
    }     
  }else{ // 已选过棋子 
    if(index != this.selected['index']){        // 與selected不是同一位置 
      if(this.chess[index]['status'] == 0){      // 未打开的棋子 
        this.show(index); 
      }else if(this.chess[index]['status'] == -1){  // 點空白位置 
        this.move(index); 
      }else{                     // 點其他棋子 
        if(this.chess[index]['type']==this.chesstype[this.player]){ 
          this.select(index); 
        }else{      
          this.kill(index); 
        } 
      } 
    } 
  } 
} 
 
// show chess 
ChessClass.prototype.show = function(index){ 
  $(this.getid(index)).innerHTML = '<img src="images/' + this.chess[index]['chess'] + '.gif" />'; 
  this.chess[index]['status'] = 1;  // opened 
  if(this.selected!=null){      // 清空選中 
    $(this.getid(this.selected.index)).className = ''; 
    this.selected = null; 
  }   
  this.change_player(); 
  this.gameover(); 
} 
 
// select chess 
ChessClass.prototype.select = function(index){ 
  if(this.selected!=null){ 
    $(this.getid(this.selected['index'])).className = ''; 
  } 
  this.selected = {'index':index, 'chess':this.chess[index]}; 
  $(this.getid(index)).className = 'onsel'; 
} 
 
// move chess 
ChessClass.prototype.move = function(index){ 
  if(this.beside(index)){ 
    this.chess[index] = {'chess':this.selected['chess']['chess'], 'type':this.selected['chess']['type'], 'val':this.selected['chess']['val'], 'status':this.selected['chess']['status']}; 
    this.remove(this.selected['index']); 
    this.show(index); 
  } 
} 
 
// kill chess 
ChessClass.prototype.kill = function(index){ 
  if(this.beside(index)==true && this.can_kill(index)==true){ 
    this.chess[index] = {'chess':this.selected['chess']['chess'], 'type':this.selected['chess']['type'], 'val':this.selected['chess']['val'], 'status':this.selected['chess']['status']}; 
    this.remove(this.selected['index']); 
    var killed = this.player==1&#63; 2 : 1; 
    $('grade_num' + killed).innerHTML = parseInt($('grade_num' + killed).innerHTML)-1;  
    this.show(index); 
  } 
} 
 
// remove chess 
ChessClass.prototype.remove = function(index){ 
  this.chess[index]['status'] = -1;  // empty 
  $(this.getid(index)).innerHTML = ''; 
  $(this.getid(index)).className = ''; 
} 
 
/* check is beside 
* @param index   目標棋子index 
* @param selindex  执行的棋子index，可为空, 为空则读取选中的棋子 
*/ 
ChessClass.prototype.beside = function(index,selindex){ 
  if(typeof(selindex)=='undefined'){ 
    if(this.selected!=null){ 
      selindex = this.selected['index']; 
    }else{ 
      return false; 
    } 
  } 
 
  if(typeof(this.chess[index])=='undefined'){ 
    return false; 
  } 
 
  var from_info = this.getid(selindex).split('_'); 
  var to_info = this.getid(index).split('_'); 
  var fw = parseInt(from_info[0]); 
  var fc = parseInt(from_info[1]); 
  var tw = parseInt(to_info[0]); 
  var tc = parseInt(to_info[1]); 
 
  if(fw==tw && Math.abs(fc-tc)==1 || fc==tc && Math.abs(fw-tw)==1){  // row or colunm is same and interval=1 
    return true; 
  }else{ 
    return false; 
  } 
} 
 
/* check can kill 
* @param index   被消灭的棋子index 
* @param selindex  执行消灭的棋子index，可为空, 为空则读取选中的棋子 
*/ 
ChessClass.prototype.can_kill = function(index,selindex){ 
  if(typeof(selindex)=='undefined'){ // 没有指定执行消灭的棋子 
    if(this.selected!=null){    // 有选中的棋子 
      selindex = this.selected['index']; 
    }else{ 
      return false; 
    } 
  } 
  if(this.chess[index]['type']!=this.chesstype[this.player]){ 
    if(parseInt(this.chess[selindex]['val'])==7 && parseInt(this.chess[index]['val'])==1){ // 7 can kill 1 
      return true; 
    }else if(parseInt(this.chess[selindex]['val'])==1 && parseInt(this.chess[index]['val'])==7){ // 1 can't kill 7 
      return false; 
    }else if(parseInt(this.chess[selindex]['val']) <= parseInt(this.chess[index]['val'])){  // small kill big 
      return true; 
    } 
  } 
  return false; 
} 
 
// change player 
ChessClass.prototype.change_player = function(){ 
  if(this.player == 1){ 
    this.player = 2;  // to green 
    $('grade_img2').className = 'img_on'; 
    $('grade_img1').className = 'img'; 
  }else{ 
    this.player = 1;  // to red 
    $('grade_img1').className = 'img_on'; 
    $('grade_img2').className = 'img'; 
  } 
} 
 
// reset grade 
ChessClass.prototype.reset_grade = function(){ 
  $('grade_img1').className = 'img_on'; 
  $('grade_img2').className = 'img'; 
  $('grade_num1').innerHTML = $('grade_num2').innerHTML = 16; 
  $('grade_res1').className = $('grade_res2').className = 'none'; 
  $('grade_res1').innerHTML = $('grade_res2').innerHTML = ''; 
} 
 
// game over 
ChessClass.prototype.gameover = function(){ 
  if($('grade_num1').innerHTML==0 || $('grade_num2').innerHTML==0){  // 任一方棋子为0 
    this.isover = 1; 
    this.show_grade(); 
    disp('init_div','show'); 
  }else{ 
    if(this.can_action()==false){ 
      this.isover = 1; 
      this.show_grade(); 
      disp('init_div','show'); 
    } 
  } 
} 
 
// show grade 
ChessClass.prototype.show_grade = function(){ 
  var num1 = parseInt($('grade_num1').innerHTML); 
  var num2 = parseInt($('grade_num2').innerHTML); 
  if(num1>num2){ // 红方胜 
    $('grade_res2').innerHTML = 'LOSS'; 
    $('grade_res2').className = 'loss'; 
    $('grade_res1').innerHTML = 'WIN'; 
    $('grade_res1').className = 'win'; 
  }else if(num1<num2){ // 黑方胜 
    $('grade_res1').innerHTML = 'LOSS'; 
    $('grade_res1').className = 'loss'; 
    $('grade_res2').innerHTML = 'WIN'; 
    $('grade_res2').className = 'win'; 
  }else{ // 平局 
    $('grade_res1').innerHTML = $('grade_res2').innerHTML = 'DRAW'; 
    $('grade_res1').className = $('grade_res2').className = 'draw'; 
  } 
} 
 
// check chess can action 
ChessClass.prototype.can_action = function(){ 
  var chess = this.chess; 
  for(var i=0,max=chess.length; i<max; i++){ 
  if(chess[i].status==0){ // 有未翻开的棋子 
    return true; 
  }else{ 
    if(chess[i].status==1 && chess[i].type==this.chesstype[this.player]){  // 己方已翻开的棋子 
      if(this.beside(i-this.boardcols, i) && (chess[i-this.boardcols].status==-1 || this.can_kill(i-this.boardcols,i) )){ // 上 
        return true; 
      } 
      if(this.beside(i+this.boardcols, i) && (chess[i+this.boardcols].status==-1 || this.can_kill(i+this.boardcols,i) )){ // 下 
        return true; 
      } 
      if(this.beside(i-1, i) && (chess[i-1].status==-1 || this.can_kill(i-1,i) )){  // 左 
        return true; 
      } 
      if(this.beside(i+1, i) && (chess[i+1].status==-1 || this.can_kill(i+1,i) )){  // 右 
        return true; 
      } 
    } 
  } 
  } 
  return false; 
} 
 
/** common function */ 
 
// get document.getElementBy(id) 
function $(id){ 
  this.id = id; 
  return document.getElementById(id); 
} 
 
// get document.getElementsByTagName 
function $_tag(name, id){ 
  if(typeof(id)!='undefined'){ 
    return $(id).getElementsByTagName(name); 
  }else{ 
    return document.getElementsByTagName(name);  
  } 
} 
 
/* div show and hide 
* @param id dom id 
* @param handle show or hide 
*/ 
function disp(id, handle){ 
  if(handle=='show'){ 
    $(id).style.display = 'block'; 
  }else{ 
    $(id).style.display = 'none';   
  } 
} 
 
/* img preload 
* @param img    要加载的图片数组 
* @param callback  图片加载成功后回调方法 
*/ 
function img_preload(img, callback){ 
  var onload_img = 0; 
  var tmp_img = []; 
  for(var i=0,imgnum=img.length; i<imgnum; i++){ 
    tmp_img[i] = new Image(); 
    tmp_img[i].src = img[i]; 
    if(tmp_img[i].complete){ 
      onload_img ++; 
    }else{ 
      tmp_img[i].onload = function(){ 
        onload_img ++; 
      } 
    } 
  } 
  var et = setInterval( 
    function(){ 
      if(onload_img==img.length){ // 定时器,判断图片完全加载后调用callback 
        clearInterval(et); 
        callback(); 
      } 
    },200); 
}

完全なサンプルコードについては、ここをクリックしてくださいこのサイトからダウンロードしてください。

この記事で説明されている内容は、JavaScript ゲーム デザインを学ぶすべての人にとって一定の参考価値があると信じています。