Scrolling menu with multi page jQuery click and scroll

var $header_menu_link = $('.appmax-header-menu ul li a');
if ($header_menu_link.is_exist()) {

  $header_menu_link.on('click', function(e){

    var href = $(this).attr("href");
    if (/#/.test(this.href)) {
      if ( $(href).length ) {
        var minus = 100;
        var offsetTop = href === "#" ? 0 : $(href).offset().top - minus;
        $('body , html').stop().animate({
          scrollTop: offsetTop,
        }, 500);
        e.preventDefault();
        return false;
      } else {
        var pathname = window.location.pathname,
          url = window.location.href,
          get_home = url.substring(0, url.lastIndexOf("."));
          get_home = get_home.substring(0, get_home.lastIndexOf("/"));

          if ( href.length ) {
            window.location.href = get_home + href;
          } else {
            window.location.href = get_home;
          }
      } 
    } // if href has hash

  });

} // end header menu init