求捉虫！JS跨页面传参失败！

取值不对你传的是 select

    function openWindow(obj){
        window.open('2.jsp?name=' + document.getElementById('list').value ,'_blank');
    }另外option元素缺少value属性。
改成这样就成功了，如果用你的方法，需要在哪里添加怎么样的属性？
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">    function openWindow(obj){
     var oSelect = document.all.list;

        window.open('2.jsp?name=' + oSelect.options[oSelect.selectedIndex].value ,'_blank');
    }
</script></head>
<body>
<%
        Connection conn = null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        ArrayList list = new ArrayList();
        conn = DBHelper.getMySql();
        String sql="select * from format_temp";
        try {
ps = conn.prepareStatement(sql);
rs = ps.executeQuery();
while(rs.next()) {
list.add(rs.getObject("name"));
}

} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
    %> <form action="" method="post" name="form1" id="form1">
<select name="listOption" id="list">
<%for(int i=0;i<list.size();i++){%>
<option><%=list.get(i).toString()%></option>
<%}%> </select>
<input type="button" value="修改" onclick="openWindow(form1)">
</form></body>
</html>
<body>
    <% String s = new String(request.getParameter("name").getBytes("ISO-8859-1"),"utf-8"); %>
    name:<%= s %> </body>