a.aspx
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
<script type="text/javascript" language="javascript">
function test(a){
document.all.item("Image1").src=document.getElementById("FileUpload1").value;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FileUpload1" runat="server" onchange="test(this)" />
<br />
<asp:Image ID="Image1" runat="server" Height="82px" Width="90px" />
</div>
</form>
</body>
</html>
跟别人的相比感觉这个太小儿科了,大家不要见笑。