js事件调用
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" 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 id="Head1" runat="server">
     <title></title>
     <script type="text/javascript">               
        function aa()
        {
         alert("123");
        }           
     </script>
</head>
<body>
     <form id="form1" runat="server">
     <asp:Button ID="Button1" runat="server" OnClick="aa();" Text="Button" />
     </form>
</body>
</html>
代码是这样的。我想知道为什么出错
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