asp.net后台调用前台js代码

private string categoryId = "0";
protected void Page_Load(object sender, EventArgs e)
{
    if (!String.IsNullOrEmpty(Request.QueryString["categoryId"]))
    {
        categoryId = Request.QueryString["categoryId"];  
    }
    Page.ClientScript.RegisterStartupScript(this.GetType(), "", "load("+categoryId+")",   true);
}

function load(categoryId) {
    $.ajax({
        type: "get",
        url: '<%=ResolveUrl("~/Componects/FriendLink.ashx") %>',
        dataType: "json",
        data:"categoryId="+categoryId,
        success: function (result) {
            $.each(result, function (index, data) {
　　　　　　 });
        }
    });
};