请问一个常识性的有关问题，请
日期：2014-05-18 浏览次数：20451 次
请教一个常识性的问题，请高手指点。
<%@ Page Language= "C# " AutoEventWireup= "true " CodeFile= "Product_Update.aspx.cs " Inherits= "WebUI.Manage.Prduct_Update " %>
<!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 runat= "server ">
<title> Unit Page </title>
</head>
<script language=javascript type= "text/javascript ">
function ShowTempImage(imageCtlID,fileCtlID)
{
var filepath=document.getElementById(fileCtlID).value;
var fileEx=filePath.split( ". ");
var fileExName=(fileEx[fileEx.Length-1]).toLowerCase();
if(fileExName== "jpg "||fileExName== "gif ")
{
document.getElementById(imageCtlID).style.visibility= "visible ";
document.getElementById(imageCtlID).src=filePath;
}
else
{
document.getElementById(imageCtlID).style.visibility= "hidden ";
}
}
</script>
<body>
<form id= "form1 " runat= "server ">
<div>
<table border= "0 " style= "width:100% ">
<tr>
<td style= "width:100% ">
</td>
</tr>
<tr>
<td style= "width:100%;height:152px; ">
<table border= "1 " style= "width:100% ">
<tr>
<td style= "width:100% "> 产品名称 </td>
<td style= "width:546px ">
<asp:TextBox ID= "txt_pname " runat=server> </asp:TextBox>
</td>
</tr>
<tr>
<td style= "width:100% "> 类别 </td>
<td style= "width:546px ">
<asp:DropDownList ID= "ddl_ptype " runat=server Width= "158px "&
<%@ Page Language= "C# " AutoEventWireup= "true " CodeFile= "Product_Update.aspx.cs " Inherits= "WebUI.Manage.Prduct_Update " %>
<!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 runat= "server ">
<title> Unit Page </title>
</head>
<script language=javascript type= "text/javascript ">
function ShowTempImage(imageCtlID,fileCtlID)
{
var filepath=document.getElementById(fileCtlID).value;
var fileEx=filePath.split( ". ");
var fileExName=(fileEx[fileEx.Length-1]).toLowerCase();
if(fileExName== "jpg "||fileExName== "gif ")
{
document.getElementById(imageCtlID).style.visibility= "visible ";
document.getElementById(imageCtlID).src=filePath;
}
else
{
document.getElementById(imageCtlID).style.visibility= "hidden ";
}
}
</script>
<body>
<form id= "form1 " runat= "server ">
<div>
<table border= "0 " style= "width:100% ">
<tr>
<td style= "width:100% ">
</td>
</tr>
<tr>
<td style= "width:100%;height:152px; ">
<table border= "1 " style= "width:100% ">
<tr>
<td style= "width:100% "> 产品名称 </td>
<td style= "width:546px ">
<asp:TextBox ID= "txt_pname " runat=server> </asp:TextBox>
</td>
</tr>
<tr>
<td style= "width:100% "> 类别 </td>
<td style= "width:546px ">
<asp:DropDownList ID= "ddl_ptype " runat=server Width= "158px "&
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