📄 fileupload.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="FileUpload.aspx.cs" Inherits="FileUpload" %>
<!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>无标题页</title>
</head>
<script language="javascript">
function CheckImg(FileUpload)
{
var mime=FileUpload.value;
mime=mime.toLowerCase().substr(mime.lastIndexOf("."));
if(mime!=".jpg")
{
FileUpload.value="";
alert("仅支持JPG格式");
}
}
</script>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload onchange="CheckImg(this)" ID="fulFile" runat="server" Style="z-index: 100; left: 30px; position: absolute;
top: 61px" />
<asp:Label ID="lblFile" runat="server" Height="63px" Style="z-index: 101; left: 26px;
position: absolute; top: 128px" Width="268px"></asp:Label>
<asp:Button ID="btnFile" runat="server" OnClick="btnFile_Click" Style="z-index: 102;
left: 30px; position: absolute; top: 91px" Text="上传" Width="105px" />
</div>
</form>
</body>
</html>
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