jsp的变量作用域
下面是动态生成列表，class表包括字段
编号，大类，小类
如 1，电脑，联想
这是asp文件
<%@LANGUAGE= "VBSCRIPT " CODEPAGE= "936 "%>
<!--#include file= "../Include/conn.asp " -->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 无标题文档 </title>
<body>
<%
dim count
strsql= "select * from class order by 大类,小类 "
set rst=con.execute(strsql)
%>
<script language= "JavaScript ">
var total;
subcat=new array();
<% count=0
do while not rst.eof %>
subcat[ <% =count %> ]=new array( " <% =rst(1) %> ", " <% =rst(2) %> ");
<% count=count+1
rst.movenext
loop
rst.close %>
total= <% =count %> ;
function changes(ee)
{alert( 'a ' + window.total);
alert( 'a ' + ee);
document.myform.nd2.lenght=0;
alert( 'b ' + total);
}
changes( "ee ")
</script>
<form action= " " method= "post " name= "myform " id= "myform ">
<table width= "200 " border= "0 " align= "center ">
<tr>
<td> 大类 </td>
<td> <% rst.open "select distinct 大类 from class order by 大类 ",con,1,1
if rst.eof then
response.write "请先添加大类。 "
response.end
else %>
<select name= "st1 " onchange= "changes(this.value) ">
<option selected value= " <% =rst(0) %> ">
<% =rst(0) %>
</option>
<%
nd2v=rst(0)
rst.movenext
do while not rst.eof %>
<option value= " <% =rst(0) %> ">
<% =rst(0) %>
</option>
<% rst.movenext
loop
end if
rst.close %>
</select>
</td>
</tr>
<tr>
<td> 小类 </td>
<td> <select name= "nd2 ">
<%
strsql= "select 小类 from class where 大类= ' " & nd2v & " ' "
rst.open strsql,con,1,1
do while not rst.eof %>
<option value= " <% =rst(0) %> ">
<% =rst(0) %>
</option>
<% rst.movenext
loop
rst.close %>
</select> </td>
</tr>
</table>
</form>
</body>
</html>
******************************************************
以下是asp文件生成的结果（用查看源文件）
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN " "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd ">
<html xmlns= "http://www.w3.org/1999/xhtml ">
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 " />
<title> 无标题文档 </title>
<body>
<script language= "JavaScript ">
var total;
subcat=new array();
subcat[0]=new array( "笔记本 ", "宏基 ");
subcat[1]=new array( "笔记本 ", "华硕 ");
subcat[2]=new array( "电脑 ", "方正 ");
subcat[3]=new array( "电脑 ", "惠普 ");
subcat[4]=new array( "电脑 ", "联想 ");
subcat[5]=new array( "图书 ", "法律 ");
subcat[6]=new array( "图书 ", "教育 ");
subcat[7]=new array( "图书 ", "科技 ");
subcat[8]=new array( "图书 ", "历史 ");
subcat[9]=new array( "图书 ", "战争 ");
subcat[10]=new array( "图书 ", "政治 ");
total=11;
function changes(ee)
{alert( 'a ' + window.total);
alert( 'a ' + ee);
document.myform.nd2.lenght=0;
alert( 'b ' + total);
}
changes( "ee ")
</script>
<form action= " " method= "post " name= "myform " id= "myform ">
<table width= "200 " border= "0 " align= "center ">
<tr>
<td> 大类 </td>
<td>
<select name= "st1 " onchange= "changes(this.value) ">
<option selected value= "笔记本 ">
笔记本
</option>
<option value= "电脑 ">
电脑
</option>
<option value= "图书 ">
图书
</option>
</select>
</td>
</tr>
<tr>
<td> 小类 </td>
<td> <select name= "nd2 ">
<option value= "华硕 ">
华硕
</option>
<option value= "宏基 ">
宏基
</option>
</select> </td>
</tr>
</table>
</form>
</body>
</html>
*****************************************
为何在函数中使用tota变量总显示为undefined
[解决办法]
这不是jsp的问题。
把window.去掉。
[解决办法]
看看这个 http://www.haolla.com/girls/index.asp
