使Bootstrap4导航栏在滚动到网站的不同div时更改颜色

<nav class="navbar navbar-expand-lg navbar-light bg-light">
  <a class="navbar-brand" href="#">Logo</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarNav">
    <ul class="navbar-nav">
      <li class="nav-item active">
        <a class="nav-link" href="#section1">Section 1</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#section2">Section 2</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#section3">Section 3</a>
      </li>
    </ul>
  </div>
</nav>

$(window).scroll(function() {
  var scrollDistance = $(window).scrollTop();

  // 判断滚动位置并更改导航栏的颜色
  if (scrollDistance >= $('#section1').offset().top) {
    $('.navbar').removeClass('bg-light').addClass('bg-primary');
  } else {
    $('.navbar').removeClass('bg-primary').addClass('bg-light');
  }
});

.navbar.bg-primary {
  background-color: #007bff !important;
}