jQuery在向下滚动页面时更改哈希(片段标识符)

$(window).scroll(function() {
  var currentSection = "";
  $("section").each(function() {
    var sectionTop = $(this).offset().top;
    var sectionHeight = $(this).height();
    var windowScrollTop = $(window).scrollTop();
    if (windowScrollTop >= sectionTop && windowScrollTop< sectionTop + sectionHeight) {
      currentSection = "#" + $(this).attr("id");
    }
  });
  if (currentSection !== "") {
    history.pushState(null, null, currentSection);
  }
});