基于HTML+JavaScript实现中国象棋

效果展示

基于HTML+JavaScript实现中国象棋_第1张图片

在线演示地址

项目基本结构

目录结构如下:

基于HTML+JavaScript实现中国象棋_第2张图片

HTML 代码

HTML 主要代码:

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CSS 代码

CSS主要代码:

@charset "gb2312";
body {
	font-size: 12px;
	line-height: 150%;
}
.box {
	margin:0 auto;
	width:460px;
	position: relative;
}
.chess_left {
	float:left;
	text-align:center
}
.chess_right {
	float:left;
	display:none
}
.move_info {
	float:left;
	margin-top:20px
}
.bill_box {
	height: 320px;
	width: 80px;
	overflow:auto;
}
.bill_box li {
	cursor:pointer;
	text-align:left
}
.bill_box li:hover {
	cursor:pointer;
	background: #C6A577;
}
.bill_box li:active {
	cursor:pointer;
	background: #fff;
}
#billList {
	margin-top:20px
}
.bn_box {
	display:none
}

JS 代码

JS代码较多这里只展示部分JS代码

人工智能初始化

AI.init = function(pace){
	var bill = AI.historyBill || com.gambit; //开局库
	if (bill.length){
		var len=pace.length;
		var arr=[];
		//先搜索棋谱
		for (var i=0;i< bill.length;i++){
			if (bill[i].slice(0,len)==pace) {
			arr.push(bill[i]);
			}
		}
		if (arr.length){
			var inx=Math.floor( Math.random() * arr.length );
			AI.historyBill = arr ;
			return arr[inx].slice(len,len+4).split("");
		}else{
			AI.historyBill = [] ;
		}
		
	}
	 //如果棋谱里面没有,人工智能开始运作
	var initTime = new Date().getTime();
	AI.treeDepth=play.depth;
	//AI.treeDepth=4;
	
	AI.number=0;
	AI.setHistoryTable.lenght = 0

	var val=AI.getAlphaBeta(-99999 ,99999, AI.treeDepth, com.arr2Clone(play.map),play.my);
	//var val = AI.iterativeSearch(com.arr2Clone(play.map),play.my)
	if (!val||val.value==-8888) {
		AI.treeDepth=2;
		val=AI.getAlphaBeta(-99999 ,99999, AI.treeDepth, com.arr2Clone(play.map),play.my);
	}
	//var val = AI.iterativeSearch(com.arr2Clone(play.map),play.my);
	if (val&&val.value!=-8888) {
		var man = play.mans[val.key];
		var nowTime= new Date().getTime();
		com.get("moveInfo").innerHTML='

AI搜索结果:

最佳着法:'+ com.createMove(com.arr2Clone(play.map),man.x,man.y,val.x,val.y)+ '
搜索深度:'+AI.treeDepth+'
搜索分支:'+ AI.number+'个
最佳着法评估:'+ val.value+'分'+ '
搜索用时:'+ (nowTime-initTime)+'毫秒' return [man.x,man.y,val.x,val.y] }else { return false; } }

迭代加深搜索算法

AI.iterativeSearch = function (map, my){
	var timeOut=100;
	var initDepth = 1;
	var maxDepth = 8;
	AI.treeDepth=0;
	var initTime = new Date().getTime();
	var val = {};
	for (var i=initDepth; i<=maxDepth; i++){
		var nowTime= new Date().getTime();
		AI.treeDepth=i;
		AI.aotuDepth=i;
		var val = AI.getAlphaBeta(-99999, 99999, AI.treeDepth , map ,my)
		if (nowTime-initTime > timeOut){
			return val;
		}
	}
	return false;
}

取得棋盘上所有棋子

AI.getMapAllMan = function (map, my){
	var mans=[];
	for (var i=0; i 
 

取得棋谱所有己方棋子的算法

AI.getMoves = function (map, my){
	var manArr = AI.getMapAllMan (map, my);
	var moves = [];
	var foul=play.isFoul;
	for (var i=0; i 
 

A:当前棋手value/B:对手value/depth:层级

AI.getAlphaBeta = function (A, B, depth, map ,my) { 
	//var txtMap= map.join();
	//var history=AI.historyTable[txtMap];
	//	if (history && history.depth >= AI.treeDepth-depth+1){
	//		return 	history.value*my;
	//}
	if (depth == 0) {
		return {"value":AI.evaluate(map , my)}; //局面评价函数; 
 	}
 	var moves = AI.getMoves(map , my ); //生成全部走法; 
 	//这里排序以后会增加效率

	for (var i=0; i < moves.length; i++) {
		
		
  	//走这个走法;
		var move= moves[i];
		var key = move[4];
		var oldX= move[0];
		var oldY= move[1];
		var newX= move[2];
		var newY= move[3];
		var clearKey = map[ newY ][ newX ]||"";

		map[ newY ][ newX ] = key;
		delete map[ oldY ][ oldX ];
		play.mans[key].x = newX;
		play.mans[key].y = newY;
		
	  if (clearKey=="j0"||clearKey=="J0") {//被吃老将,撤消这个走法; 
			play.mans[key]	.x = oldX;
			play.mans[key]	.y = oldY;
			map[ oldY ][ oldX ] = key;
			delete map[ newY ][ newX ];
			if (clearKey){
				 map[ newY ][ newX ] = clearKey;
				// play.mans[ clearKey ].isShow = false;
			}

			return {"key":key,"x":newX,"y":newY,"value":8888};
			//return rootKey; 
	  }else { 
	  	var val = -AI.getAlphaBeta(-B, -A, depth - 1, map , -my).value; 
			//val = val || val.value;
	
	  	//撤消这个走法;  
			play.mans[key]	.x = oldX;
			play.mans[key]	.y = oldY;
			map[ oldY ][ oldX ] = key;
			delete map[ newY ][ newX ];
			if (clearKey){
				 map[ newY ][ newX ] = clearKey;
				 //play.mans[ clearKey ].isShow = true;
			}
	  	if (val >= B) { 
				//将这个走法记录到历史表中; 
				//AI.setHistoryTable(txtMap,AI.treeDepth-depth+1,B,my);
				return {"key":key,"x":newX,"y":newY,"value":B}; 
			} 
			if (val > A) { 
	    	A = val; //设置最佳走法; 
				if (AI.treeDepth == depth) var rootKey={"key":key,"x":newX,"y":newY,"value":A};
			} 
		} 
 	} 
	//将这个走法记录到历史表中; 
	//AI.setHistoryTable(txtMap,AI.treeDepth-depth+1,A,my);
	if (AI.treeDepth == depth) {//已经递归回根了
		if (!rootKey){
			//AI没有最佳走法,说明AI被将死了,返回false
			return false;
		}else{
			//这个就是最佳走法;
			return rootKey;
		}
	}
 return {"key":key,"x":newX,"y":newY,"value":A}; 
}

奖着法记录到历史表

AI.setHistoryTable = function (txtMap,depth,value,my){
	AI.setHistoryTable.lenght ++;
	AI.historyTable[txtMap] = {depth:depth,value:value} 
}

评估棋局 取得棋盘双方棋子价值差

AI.evaluate = function (map,my){
	var val=0;
	for (var i=0; i 
 

完整源码下载

GitHub 地址:https://github.com/wanghao221/moyu/tree/main/游戏-57.中国象棋

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