JS乌龟吃鸡游戏

代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>乌龟游戏</title>
    <script type="text/javascript">
        function move(obj){
            //乌龟图片高度
            var wuGui_height = 67;
            //乌龟图片宽度
            var wuGui_width  = 94;
            //公鸡图片高度
            var cock_height  = 73;
            //公鸡图片宽度
            var cock_width   = 76;
            var wuGui = document.getElementById("wugui");
            var wuGui_left = parseInt(wuGui.style.left.substring(0,wuGui.style.left.indexOf("p")));
            var wuGui_top = parseInt(wuGui.style.top.substring(0,wuGui.style.top.indexOf("p")));
            var input = document.getElementsByTagName("input");
            var cock = document.getElementById("cock");
            var cock_left = parseInt(cock.style.left.substring(0,cock.style.left.indexOf("p")));
            var cock_top = parseInt(cock.style.top.substring(0,cock.style.top.indexOf("p")));
            //乌龟和公鸡左上角的距离(纵向距离)
            var y = Math.abs(wuGui_top - cock_top);
            //乌龟和公鸡左上角的距离(横向距离)
            var x = Math.abs(wuGui_left - cock_left);
            //默认不重叠
            yy = 0;
            xx = 0;
            if(obj.value == "向上走"){
                wuGui_top -= 10;
                wuGui.style.top = wuGui_top + "px";
            }
            if(obj.value == "向左走"){
                wuGui_left -= 10;
                wuGui.style.left = wuGui_left + "px";
            }
            if(obj.value == "向右走"){
                wuGui_left += 10;
                wuGui.style.left = wuGui_left + "px";
            }
            if(obj.value == "向下走"){
                wuGui_top += 10;
                wuGui.style.top = wuGui_top + "px";
            }
            //碰撞
            if(wuGui_top < cock_top){
                if( y < wuGui_height){
                    yy = 1;
                }
            }else {
                if (y < cock_height){
                    yy = 1;
                }
            }
            if(wuGui_left < cock_left){
                if( x < wuGui_width){
                    xx = 1;
                }
            }else {
                if (x < cock_width){
                    xx = 1;
                }
            }
            if(xx && yy){
                alert("乌龟吃了鸡！");
                wuGui.style.top = "100px";
                wuGui.style.top = "120px";
            }
        }
        window.onload = function () {
        }
    </script>
</head>
<body>
<table border="1">
    <tr>
        <td></td>
        <td><input type="button" value="向上走" onclick="move(this)"/></td>
        <td></td>
    </tr>
    <tr>
        <td><input type="button" value="向左走" onclick="move(this)"/></td>
        <td></td>
        <td><input type="button" value="向右走" onclick="move(this)"/></td>
    </tr>
    <tr>
        <td></td>
        <td><input type="button" value="向下走" onclick="move(this)"/></td>
        <td></td>
    </tr>
</table>
<!--把乌龟放在一个div-->
<div id="wugui" style="position: absolute ;left:100px;top:120px;">
    <img src="1.bmp" border="1" alt=""/>
</div>
<!--公鸡图片div-->
<div id="cock" style="position:absolute;left:200px;top:200px;">
    <img src="2.bmp" border="1" alt=""/>
</div>
</body>
</html>