在模板頁面：
ContentPlaceHolder控件拖放到<head></head>中間：
<asp:ContentPlaceHolder ID="head" runat="server">
</asp:ContentPlaceHolder>
在子頁，如a.aspx：
<asp:Content ID="head" ContentPlaceHolderID="head" runat="server">
<link href="a.css" rel="stylesheet" type="text/css" />
<script>
alert('hello word!');
</script>
</asp:Content>
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">
</asp:Content>
即可