b頁面?cust_linkman_add.jsp <%String cust_no = request.getParameter("cust_no"); %> <%=cust_no %> <input value="<%=cust_no %>">a頁面 cust_linkman.jsp<div class="button_bar"> <button class="common_button" onclick="help('');">幫助</button> <button class="common_button" onclick="to('../jsp/cust_linkman_add.jsp?cust_no=${cust_no}');">新建</button>?? <button class="common_button" onclick="back();">返回</button>??</div><form action=""><table class="query_form_table"> <tr> <th>客戶編號</th> <td><input type="text" name="cust_no" value="${cust_no }">${cust_no }</td>a頁面可以拿到值 b頁面拿不到值 什么問題