用page.ClientScript.RegisterStartupScript方式实现
代码为：

/**////

/// 弹出JavaScript小窗口
///

/// 窗口信息
public static void Alert(string message, Page page)
{
#region
string js = @"";
//HttpContext.Current.Response.Write(js);
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "alert"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "alert", js);
}
#endregion
}

/**////

/// 弹出消息框并且转向到新的URL
///

/// 消息内容
/// 连接地址
public static void AlertAndRedirect(string message, string toURL, Page page)
{
#region
string js = "";
//HttpContext.Current.Response.Write(string.Format(js, message, toURL));
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "AlertAndRedirect"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "AlertAndRedirect", string.Format(js, message, toURL));
}
#endregion
}

/**////

/// 回到历史页面
///

/// -1/1
public static void GoHistory(int value, Page page)
{
#region
string js = @"";
//HttpContext.Current.Response.Write(string.Format(js, value));
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "GoHistory"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "GoHistory", string.Format(js, value));
}
#endregion
}

/**////

/// 刷新父窗口
///

public static void RefreshParent(string url, Page page)
{
#region
string js = @"";
//HttpContext.Current.Response.Write(js);
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "RefreshParent"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "RefreshParent", js);
}
#endregion
}


/**////

/// 刷新打开窗口
///

public static void RefreshOpener(Page page)
{
#region
string js = @"";
//HttpContext.Current.Response.Write(js);
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "RefreshOpener"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "RefreshOpener", js);
}
#endregion
}


/**////

/// 打开指定大小的新窗体
///

/// 地址
/// 宽
/// 高
/// 头位置
/// 左位置
public static void OpenWebFormSize(string url, int width, int heigth, int top, int left, Page page)
{
#region
string js = @"";
//HttpContext.Current.Response.Write(js);
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "OpenWebFormSize"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "OpenWebFormSize", js);
}
#endregion
}


/**////

/// 转向Url制定的页面
///

/// 连接地址
public static void JavaScriptLocationHref(string url, Page page)
{
#region
string js = @"";
js = string.Format(js, url);
//HttpContext.Current.Response.Write(js);
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "JavaScriptLocationHref"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "JavaScriptLocationHref", js);
}
#endregion
}

/**////

/// 打开指定大小位置的模式对话框
///

/// 连接地址
/// 宽
/// 高
/// 距离上位置
/// 距离左位置
public static void ShowModalDialogWindow(string webFormUrl, int width, int height, int top, int left, Page page)
{
#region
string features = "dialogWidth:" + width.ToString() + "px"
+ ";dialogHeight:" + height.ToString() + "px"
+ ";dialogLeft:" + left.ToString() + "px"
+ ";dialogTop:" + top.ToString() + "px"
+ ";center:yes;help=no;resizable:no;status:no;scroll=yes";
ShowModalDialogWindow(webFormUrl, features, page);
#endregion
}

/**////

/// 弹出模态窗口
///

///
///
public static void ShowModalDialogWindow(string webFormUrl, string features, Page page)
{
string js = ShowModalDialogJavascript(webFormUrl, features);
//HttpContext.Current.Response.Write(js);
if (!page.ClientScript.IsStartupScriptRegistered(page.GetType(), "ShowModalDialogWindow"))
{
page.ClientScript.RegisterStartupScript(page.GetType(), "ShowModalDialogWindow", js);
}
}