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JS 拼图游戏面向对象，注释完整。

2009-06-18 21:38:23 作者：
原创的JS拼图游戏，面向对象，注释完整。作者 sunxing007
在线演示 http://img.jb51.net/online/pintu/pintu.htm
<html> 
<head> 
<title>JS拼图游戏</title> 
<style> 
    body{ 
        font-size:9pt; 
    } 
table{ 
border-collapse: collapse; 
} 
input{ 
    width:20px; 
} 
</style> 
</head> 
<body> 
    JS原创作品：JS拼图游戏<br> 
    注释完整， 面向对象<br> 
    转载请注明来自<a href="http://blog.csdn.net/sunxing007">http://blog.csdn.net/sunxing007</a><br> 
    <input type="text" id="lines" value='3'/>行<input type="text" id="cols" value='3'/>列 &nbsp;&nbsp; <button id="start"> 开 始 </button><br> 
<table id="board" border=1 cellspacing=0 cellpadding=0> 
        <tr><td></td><td></td><td></td></tr> 
        <tr><td></td><td></td><td></td></tr> 
</table> 
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br> 
<img id='img' src="http://img.jb51.net/online/pintu/dog.jpg" style="" /><br> 
转载请注明来自<a href="http://blog.csdn.net/sunxing007">http://blog.csdn.net/sunxing007</a><br> 
</body> 
</html> 
<script> 
//ie7以下默认不缓存背景图像，造成延迟和闪烁，修正此bug. 
//（csdn网友wtcsy提供http://blog.csdn.net/wtcsy/） 
try{ 
document.execCommand("BackgroundImageCache", false, true); 
}catch(e){alert(e)}; 
    //辅助函数 
    function $(id){return document.getElementById(id)}; 
    /************************************************* 
    * js拼图游戏 v1.6 
    * 作者 sunxing007 
    * 转载请注明来自http://blog.csdn.net/sunxing007 
    **************************************************/ 
    var PicGame = { 
            //行数 
            x: 3, 
            //列数 
            y: 3, 
            //图片源 
            img: $('img'), 
            //单元格高度 
            cellHeight: 0, 
            //单元格宽度 
            cellWidth: 0, 
            //本游戏最主要的对象：表格，每个td对应着一个可以移动的小格子 
            board: $('board'), 
            //初始函数 
            init: function(){ 
                        //确定拼图游戏的行数和列数 
                        this.x = $('lines').value>1?$('lines').value : 3; 
                        this.y = $('cols').value>1?$('cols').value : 3; 
                        //删除board原有的行 
                        while(this.board.rows.length>0){ 
                                this.board.deleteRow(0); 
                        } 
                        //按照行数和列数重新构造board 
                        for(var i=0; i<this.x; i++){ 
                                var tr = this.board.insertRow(-1); 
                                for(var j=0; j<this.y; j++){ 
                                        var td=tr.insertCell(-1); 
                                } 
                        } 
                        //计算单元格高度和宽度 
                        this.cellHeight = this.img.height/this.x; 
                        this.cellWidth = this.img.width/this.y; 
                        //获取所有的td 
                        var tds = this.board.getElementsByTagName('td'); 
                        //对每个td， 设置样式 
                     for(var i=0; i<tds.length-1; i++){ 
                             tds[i].style.width = this.cellWidth; 
                             tds[i].style.height = this.cellHeight; 
                             tds[i].style.background = "url(" + this.img.src + ")"; 
                             tds[i].style.border = "solid #ccc 1px"; 
                             var currLine = parseInt(i/this.y); 
                             var currCol = i%this.y; 
                             //这里最重要，计算每个单元格的背景图的位置，使他们看起来像一幅图像 
                             tds[i].style.backgroundPositionX = -this.cellWidth * currCol; 
                             tds[i].style.backgroundPositionY = -this.cellHeight * currLine; 
                     } 
                     /** begin: 打乱排序*******************/ 
                     /** 
                     *    打乱排序的算法是这样的：比如我当前是3*3布局， 
                     * 则我为每一个td产生一个目标位置，这些目标位置小于9且各不相同， 
                     * 然后把它们替换到那个地方。 
                     **/ 

                     //目标位置序列 
                     var index = []; 
                     index[0] = Math.floor(Math.random()*(this.x*this.y)); 
                     while(index.length<(this.x*this.y)){ 
                     var num = Math.floor(Math.random()*(this.x*this.y)); 
                     for(var i=0; i<index.length; i++){ 
                     if(index[i]==num){ 
                     break; 
                     } 
                     } 
                     if(i==index.length){ 
                     index[index.length] = num; 
                     } 
                     //window.status = index; 
                     } 
                     var cloneTds = []; 
                     //把每个td克隆， 然后依据目标位置序列index，替换到目标位置 
                     for(var i=0; i<tds.length; i++){ 
                     cloneTds.push(tds[i].cloneNode(true)); 
                     } 
                     for(var i=0; i<index.length; i++){ 
                     tds[i].parentNode.replaceChild(cloneTds[index[i]],tds[i]); 
                     } 
                     /** end: 打乱排序*********************/ 

                     //为每个td添加onclick事件。 
                     tds = this.board.getElementsByTagName('td'); 
                     for(var i=0; i<tds.length; i++){ 
                             tds[i].onclick = function(){ 
                             //被点击对象的坐标 
                         var row = this.parentNode.rowIndex; 
                         var col = this.cellIndex; 
                         //window.status = "row:" + row + " col:" + col; 
                         //空白方块的坐标 
                         var rowBlank = 0; 
                         var colBlank = 0; 
                         //reachable表示当前被点击的方块是否可移动 
                         var reachable = false; 
                         if(row+1<PicGame.x && PicGame.board.rows[row+1].cells[col].style.background == ''){ 
                         rowBlank = row + 1; 
                         colBlank = col; 
                         reachable = true; 
                         //window.status +=" reachable! rowBlank: " + rowBlank + " colBlank:" + colBlank; 
                         } 
                         else if(row-1>=0 && PicGame.board.rows[row-1].cells[col].style.background == ''){ 
                         rowBlank = row - 1; 
                         colBlank = col; 
                         reachable = true; 
                         //window.status +=" reachable! rowBlank: " + rowBlank + " colBlank:" + colBlank; 
                         } 
                         else if(col+1<PicGame.y && PicGame.board.rows[row].cells[col+1].style.background == ''){ 
                         rowBlank = row; 
                         colBlank = col + 1; 
                         reachable = true; 
                         //window.status +=" reachable! rowBlank: " + rowBlank + " colBlank:" + colBlank; 
                         } 
                         else if(col-1>=0 && PicGame.board.rows[row].cells[col-1].style.background == ''){ 
                         rowBlank = row; 
                         colBlank = col - 1; 
                         reachable = true; 
                         //window.status +=" reachable! rowBlank: " + rowBlank + " colBlank:" + colBlank; 
                         } 
                         else{ 
                         //window.status +=" unreachable!"; 
                         reachable = false; 
                         } 
                         //如果可移动，则把当前方块和空白方块交换 
                         if(reachable){ 
                         var tmpBlankNode = PicGame.board.rows[rowBlank].cells[colBlank].cloneNode(true); 
                         //需要注意的是克隆对象丢失了onclick方法，所以要补上 
                         tmpBlankNode.onclick = arguments.callee; 
                         var tmpCurrNode = PicGame.board.rows[row].cells[col].cloneNode(true); 
                         tmpCurrNode.onclick = arguments.callee; 
                         PicGame.board.rows[rowBlank].cells[colBlank].parentNode.replaceChild(tmpCurrNode,PicGame.board.rows[rowBlank].cells[colBlank]); 
                         PicGame.board.rows[row].cells[col].parentNode.replaceChild(tmpBlankNode, PicGame.board.rows[row].cells[col]); 
                         } 
                         } 
                     } 
            } 
    }; 
PicGame.init(); 
$('start').onclick = function(){ 
        PicGame.init(); 
} 
</script> 
JS 拼图游戏 面向对象，注释完整。

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