Bookmark With Media Query

$(function() {
  $('a[href*=#]:not([href=#])').click(function() {

    if($(window).width() > 981){
      var header_height =$('header.header').height();
      if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
        var target = $(this.hash);
        target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
        if (target.length) {
          $('html,body').animate({
            scrollTop: target.offset().top - header_height + 30
          }, 800);
          return false;
        }
      }
    }
    else{
      if (location.pathname.replace(/^\//,'') == this.pathname.replace(/^\//,'') && location.hostname == this.hostname) {
        var target = $(this.hash);
        target = target.length ? target : $('[name=' + this.hash.slice(1) +']');
        if (target.length) {
          $('html,body').animate({
            scrollTop: target.offset().top - 0
          }, 800);
          return false;
        }
      }

    }
  });
});