在页面加载前动态加载js文件

protected override void OnLoadComplete(EventArgs e)
{
        HtmlLink lnkCss = new HtmlLink();
        lnkCss.Attributes["type"] = "text/css";
        lnkCss.Attributes["rel"] = "stylesheet";
        lnkCss.Attributes["href"] = "../userforms/QE/CSS/CusComplaints.css";
        ((Page)System.Web.HttpContext.Current.Handler).Header.Controls.Add(lnkCss);

        Page.Header.Controls.Add(new System.Web.UI.LiteralControl("<script type=\"text/javascript\"  src=\"JS/CusComplaints.js\"></script>"));

        this.Page.ClientScript.RegisterStartupScript(this.GetType(), "dd", "Binit()", true);
}