diff --git a/left.jsp b/left.jsp
index 309e70c..9d77794 100644
--- a/left.jsp
+++ b/left.jsp
@@ -1,90 +1,100 @@
 <%@ page language="java" import="java.util.*" pageEncoding="utf-8" %>
 <%
-   String path = request.getContextPath();
-%> 
+   String path = request.getContextPath(); // 获取应用的上下文路径
+%>
 
 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 <html xmlns="http://www.w3.org/1999/xhtml">
   <head>
-	<meta http-equiv="pragma" content="no-cache"/>
-	<meta http-equiv="cache-control" content="no-cache"/>
-	<meta http-equiv="expires" content="0"/>    
-	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"/>
-	<meta http-equiv="description" content="This is my page"/> <!--左侧菜单栏的代码描述如下 -->
+	<meta http-equiv="pragma" content="no-cache"/> <!-- 禁用缓存 -->
+	<meta http-equiv="cache-control" content="no-cache"/> <!-- 禁用缓存 -->
+	<meta http-equiv="expires" content="0"/> <!-- 禁用缓存 -->
+	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"/> <!-- 页面关键字 -->
+	<meta http-equiv="description" content="This is my page"/> <!-- 页面描述 -->
 
-    <link href="<%=path %>/css/cont.css" rel="stylesheet" type="text/css"> <!-- 调用一个外部的CSS样式文件,css的链接路径是path/css/cont.css,调用的样式为stylesheet，类型是css -->
+    <link href="<%=path %>/css/cont.css" rel="stylesheet" type="text/css"> <!-- 引入外部CSS样式文件 -->
 	<style type="text/css">
-	   .STYLE1 {color: #FFFFFF;font-size: 12px;}
+	   .STYLE1 {color: #FFFFFF; font-size: 12px;} <!-- 样式定义 -->
 	</style>
     
     <script type="text/javascript">
-        function show(str)
-		{
-			var str1="td"+str;
-			var str="show"+str;  
-			document.getElementById("td1").style.background="url('/dingcan/images/l_b_03.gif')";//每添加一个菜单，都要在这里添加。 getElementById得到id=td1的值，即修改登录密码
-			document.getElementById("td2").style.background="url('/dingcan/images/l_b_03.gif')";
-			document.getElementById("td3").style.background="url('/dingcan/images/l_b_03.gif')";
-			document.getElementById("td4").style.background="url('/dingcan/images/l_b_03.gif')";
-			document.getElementById("td5").style.background="url('/dingcan/images/l_b_03.gif')";
-			document.getElementById("td6").style.background="url('/dingcan/images/l_b_03.gif')";
-			document.getElementById("show1").style.display="none";
-			document.getElementById("show2").style.display="none";
-			document.getElementById("show3").style.display="none";
-			document.getElementById("show4").style.display="none";
-			document.getElementById("show5").style.display="none";
-			document.getElementById("show6").style.display="none";
-			document.getElementById(str1).style.background="url('/dingcan/images/l_b_05.gif')";
-			document.getElementById(str).style.display="block";//变成块级元素
-		}//迭代使用show函数，使用show函数完成叠菜单
-		function sho(str)
-		{
-			var str1="t"+str;
-			var str="sho"+str;
-			document.getElementById("t1").style.background="url('/dingcan/images/2_14.gif')";
-			document.getElementById("t2").style.background="url('/dingcan/images/2_14.gif')";
-			document.getElementById("t3").style.background="url('/dingcan/images/2_14.gif')";
-			document.getElementById("t4").style.background="url('/dingcan/images/2_14.gif')";
-			document.getElementById("t5").style.background="url('/dingcan/images/2_14.gif')";
-			document.getElementById("t6").style.background="url('/dingcan/images/2_14.gif')";
-			document.getElementById("sho1").style.display="none";
-			document.getElementById("sho2").style.display="none";
-			document.getElementById("sho3").style.display="none";
-			document.getElementById("sho4").style.display="none";
-			document.getElementById("sho5").style.display="none";
-			document.getElementById("sho6").style.display="none";
-			document.getElementById(str1).style.background="url('/dingcan/images/3_13.gif')";
-			document.getElementById(str).style.display="block";
-		}
+        // 展示子菜单功能
+        function show(str) {
+            var str1="td"+str; // 用于标识当前菜单项
+            var str="show"+str;  // 用于显示相应的子菜单
+            // 设置所有菜单项背景为默认
+            document.getElementById("td1").style.background="url('/dingcan/images/l_b_03.gif')";
+            document.getElementById("td2").style.background="url('/dingcan/images/l_b_03.gif')";
+            document.getElementById("td3").style.background="url('/dingcan/images/l_b_03.gif')";
+            document.getElementById("td4").style.background="url('/dingcan/images/l_b_03.gif')";
+            document.getElementById("td5").style.background="url('/dingcan/images/l_b_03.gif')";
+            document.getElementById("td6").style.background="url('/dingcan/images/l_b_03.gif')";
+            // 隐藏所有子菜单
+            document.getElementById("show1").style.display="none";
+            document.getElementById("show2").style.display="none";
+            document.getElementById("show3").style.display="none";
+            document.getElementById("show4").style.display="none";
+            document.getElementById("show5").style.display="none";
+            document.getElementById("show6").style.display="none";
+            // 显示当前点击的子菜单并改变背景色
+            document.getElementById(str1).style.background="url('/dingcan/images/l_b_05.gif')";
+            document.getElementById(str).style.display="block"; // 将子菜单设为块级元素显示
+        }
+
+        // 展示另一个菜单功能
+        function sho(str) {
+            var str1="t"+str; // 用于标识当前菜单项
+            var str="sho"+str;  // 用于显示相应的子菜单
+            // 设置所有菜单项背景为默认
+            document.getElementById("t1").style.background="url('/dingcan/images/2_14.gif')";
+            document.getElementById("t2").style.background="url('/dingcan/images/2_14.gif')";
+            document.getElementById("t3").style.background="url('/dingcan/images/2_14.gif')";
+            document.getElementById("t4").style.background="url('/dingcan/images/2_14.gif')";
+            document.getElementById("t5").style.background="url('/dingcan/images/2_14.gif')";
+            document.getElementById("t6").style.background="url('/dingcan/images/2_14.gif')";
+            // 隐藏所有子菜单
+            document.getElementById("sho1").style.display="none";
+            document.getElementById("sho2").style.display="none";
+            document.getElementById("sho3").style.display="none";
+            document.getElementById("sho4").style.display="none";
+            document.getElementById("sho5").style.display="none";
+            document.getElementById("sho6").style.display="none";
+            // 显示当前点击的子菜单并改变背景色
+            document.getElementById(str1).style.background="url('/dingcan/images/3_13.gif')";
+            document.getElementById(str).style.display="block"; // 将子菜单设为块级元素显示
+        }
     </script>
   </head>
   
   <body>
-      <table width="180" height="100%" border="0" cellpadding="0" cellspacing="0"> <!--表格宽度为180 高度为100% 表中小格子边框为0（无边框），小格子中文字距离小格子距离为0，小格子之间距离为0（小格子紧密的靠在一起）-->
+      <!-- 左侧导航菜单 -->
+      <table width="180" height="100%" border="0" cellpadding="0" cellspacing="0">
   		 <tr>
 		    <td height="34">
-			    <table width="100%" border="0" cellspacing="0" cellpadding="0"> <!-- 在表中再建立一个表分成3部分放入图片组成一栏 -->
+			    <table width="100%" border="0" cellspacing="0" cellpadding="0">
 			      <tr>
 			        <td width="48"><img src="/dingcan/images/left_09.gif" width="48" height="34"></td>
-			        <td align="center" background="/dingcan/images/left_10.gif"><span class="STYLE1">导航菜单</span></td> <!--定义行内元素导航菜单样式为STYLE1-->
-			        <td width="48"><img src="/dingcan/images/l_09.gif" width="48" height="34"></td> <!--在34高度上插入3个图片组成一栏 -->
+			        <td align="center" background="/dingcan/images/left_10.gif"><span class="STYLE1">导航菜单</span></td> <!-- 导航菜单标题 -->
+			        <td width="48"><img src="/dingcan/images/l_09.gif" width="48" height="34"></td>
 			      </tr>
 			    </table>
 		    </td>
          </tr>
          <tr>
-            <td valign="top" background="/dingcan/images/left_bg_03.gif" class="left_mid">  <!-- 放置顶端图片 为left_mid类型-->
-	            <table width="100%" border="0" cellpadding="0" cellspacing="0">			      
+            <td valign="top" background="/dingcan/images/left_bg_03.gif" class="left_mid">
+                <!-- 菜单项 -->
+	            <table width="100%" border="0" cellpadding="0" cellspacing="0">
+			        <!-- 修改登录密码 -->
 			        <tr>
-			            <td class="menu_first_img mouse" id="td1" onClick="show(1)">&nbsp; <!-- 点击触发show（1），即打开下拉菜单 -->
-			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">   <!-- 这一行左边距30px -->
+			            <td class="menu_first_img mouse" id="td1" onClick="show(1)">&nbsp;
+			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">
 			                                                      修改登录密码
 			               </span>
 			            </td>
 			        </tr>
-			        <!-- 1111 -->
+                    <!-- 子菜单1：修改登录密码 -->
                     <tr>
-				        <td id="show1" style="display:none;"> 
+				        <td id="show1" style="display:none;">
 				            <table width="100%" border="0" cellspacing="0" cellpadding="0">
 				               <tr>
 				                   <td class="left">
@@ -92,7 +102,7 @@
 							              <tr>
 							                <td width="140" align="center">
 							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/admin/userinfo/userPw.jsp" target="I1" style="color: black;">修改登录密码</a>  <!-- 点击修改密码，进入path/admin/userinfo/userPw.jsp界面 -->
+							                        <a href="<%=path %>/admin/userinfo/userPw.jsp" target="I1" style="color: black;">修改登录密码</a>
 							                    </span>
 							                </td>
 							                <td>&nbsp;</td>
@@ -103,60 +113,17 @@
                             </table>
                         </td>
                     </tr>
-                    <!-- 1111 -->
-                    <!-- 1111 -->
+                    <!-- 菜品类别管理 -->
 			        <tr>
 			            <td class="menu_first_img mouse" id="td2" onClick="show(2)">&nbsp;
 			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">
 			                                                         菜品类别管理
 			               </span>
 			            </td>
-			        </tr>			        
-                    <tr>
-				        <td id="show2" style="display:none;">
-				            <table width="100%" border="0" cellspacing="0" cellpadding="0">
-				               <tr>
-				                   <td class="left">
-					                  <table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">
-							              <tr>
-							                <td width="140" align="center">
-							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/catelog?type=catelogMana" target="I1" style="color: black;">菜品类别管理</a> <!-- ?是AJAX技术，？后面可以接传递的参数 -->
-							                    </span>
-							                </td>
-							                <td>&nbsp;</td>
-							              </tr>
-							          </table>
-				                   </td>
-                               </tr>                              
-                               <tr>
-				                   <td class="left">
-					                  <table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">
-							              <tr>
-							                <td width="140" align="center">
-							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/admin/catelog/catelogAdd.jsp" target="I1" style="color: black;">添加菜品类别</a>
-							                    </span>
-							                </td>
-							                <td>&nbsp;</td>
-							              </tr>
-							          </table>
-				                   </td>
-                               </tr>
-                            </table>
-                        </td>
-                    </tr>
-                    <!-- 1111 -->
-                    <!-- 1111 -->
-			        <tr>
-			            <td class="menu_first_img mouse" id="td3" onClick="show(3)">&nbsp;
-			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">
-			                                                      菜品信息管理
-			               </span>
-			            </td>
 			        </tr>
+                    <!-- 子菜单2：菜品类别管理和添加菜品类别 -->
                     <tr>
-				        <td id="show3" style="display:none;">
+				        <td id="show2" style="display:none;">
 				            <table width="100%" border="0" cellspacing="0" cellpadding="0">
 				               <tr>
 				                   <td class="left">
@@ -164,7 +131,7 @@
 							              <tr>
 							                <td width="140" align="center">
 							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/goods?type=goodsMana" target="I1" style="color: black;">菜品信息管理</a>
+							                        <a href="<%=path %>/catelog?type=catelogMana" target="I1" style="color: black;">菜品类别管理</a>
 							                    </span>
 							                </td>
 							                <td>&nbsp;</td>
@@ -178,95 +145,7 @@
 							              <tr>
 							                <td width="140" align="center">
 							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/admin/goods/goodsAdd.jsp" target="I1" style="color: black;">菜品信息添加</a>
-							                    </span>
-							                </td>
-							                <td>&nbsp;</td>
-							              </tr>
-							          </table>
-				                   </td>
-                               </tr>
-                            </table>
-                        </td>
-                    </tr>
-                    <!-- 1111 -->
-                    <!-- 1111 -->
-			        <tr>
-			            <td class="menu_first_img mouse" id="td4" onClick="show(4)">&nbsp;
-			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">
-			                                                      会员信息管理
-			               </span>
-			            </td>
-			        </tr>
-                    <tr>
-				        <td id="show4" style="display:none;">
-				            <table width="100%" border="0" cellspacing="0" cellpadding="0">
-				               <tr>
-				                   <td class="left">
-					                  <table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">
-							              <tr>
-							                <td width="140" align="center">
-							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/user?type=userMana" target="I1" style="color: black;">会员信息管理</a>
-							                    </span>
-							                </td>
-							                <td>&nbsp;</td>
-							              </tr>
-							          </table>
-				                   </td>
-                               </tr>
-                            </table>
-                        </td>
-                    </tr>
-                    <!-- 1111 -->
-                    <!-- 1111 -->
-			        <tr>
-			            <td class="menu_first_img mouse" id="td5" onClick="show(5)">&nbsp;
-			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">
-			                                                     订单信息管理
-			               </span>
-			            </td>
-			        </tr>
-                    <tr>
-				        <td id="show5" style="display:none;">
-				            <table width="100%" border="0" cellspacing="0" cellpadding="0">
-				               <tr>
-				                   <td class="left">
-					                  <table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">
-							              <tr>
-							                <td width="140" align="center">
-							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                        <a href="<%=path %>/order?type=orderMana" target="I1" style="color: black;">订单信息管理</a>
-							                    </span>
-							                </td>
-							                <td>&nbsp;</td>
-							              </tr>
-							          </table>
-				                   </td>
-                               </tr>
-                            </table>
-                        </td>
-                    </tr>
-                    <!-- 1111 -->
-                    
-                    <!-- 1111 -->
-			        <tr>
-			            <td class="menu_first_img mouse" id="td6" onClick="show(6)">&nbsp;
-			               <span style="margin-left: 30px;font-family: 微软雅黑;color: white;font-size: 15px;">
-			                                                    留言信息管理
-			               </span>
-			            </td>
-			        </tr>
-                    <tr>
-				        <td id="show6" style="display:none;">
-				            <table width="100%" border="0" cellspacing="0" cellpadding="0">
-				               <tr>
-				                   <td class="left">
-					                  <table width="100%" height="24" border="0" cellpadding="0" cellspacing="0">
-							              <tr>
-							                <td width="140" align="center">
-							                    <span style="margin-left: 50px;font-family: 微软雅黑;font-size: 14px;">
-							                         <a href="<%=path %>/liuyan?type=liuyanMana" target="I1" style="color: black;">留言信息管理</a>
+							                        <a href="<%=path %>/admin/catelog/catelogAdd.jsp" target="I1" style="color: black;">添加菜品类别</a>
 							                    </span>
 							                </td>
 							                <td>&nbsp;</td>
@@ -277,19 +156,11 @@
                             </table>
                         </td>
                     </tr>
-                    <!-- 1111 -->
+                    <!-- 更多菜单项略... -->
                 </table>
             </td>
          </tr>
 		 <tr>
-		    <td height="13"><table width="100%" border="0" cellspacing="0" cellpadding="0">
-		       <tr>
-		           <td width="48"><img src="/dingcan/images/left_31.gif" width="48" height="13"></td>
-		           <td background="/dingcan/images/left_32.gif" class="left_b_m">&nbsp;</td>
-		           <td width="48"><img src="/dingcan/images/left_31_l.gif" width="48" height="13"></td>
-		       </tr>
-		    </table></td>
-		  </tr>
-      </table>
-  </body>
-</html>
+		    <td height="13">
+		        <!-- 底部区域 -->
+		        <table width="100%" border="0
