实现代码如下：
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<!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></title>
<%--
<script type="text/javascript">
function E() {
var ary = document.getElementById("<%=TextBox1.ClientID %>");
var b = ary.tagName;
alert(ary+""+b);
}
</script>--%>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button runat="server" ID="btn" Text="asd" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<input type="button" onclick="E();" value="ssss" />
</div>
</form>
</body>
</html>
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