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<head runat="server">
<title>无标题页</title>
<script language =javascript>
function funTrigger()
{
var obj=document.getElementById("FUp1");
obj.click();
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload ID="FUp1" runat="server" />
<br />
<input type="button" value="Trigger" id="btnTrigger" onclick="funTrigger()" />
</div>
</form>
</body>
</html>