/** 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){ // 未選過棋子     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{ // 已選過棋子     if(index != this.selected['index']){        // 

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