JQuery — 導覽列滾動偵測

HTML 結構

引用 Bootstrap card component

<div class="card" style="width: 18rem; margin: 30px auto">
  <img src="https://images.unsplash.com/photo-1541167760496-1628856ab772?ixlib=rb-4.0.3&ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&auto=format&fit=crop&w=1037&q=80" class="card-img-top" alt="...">
  <div class="card-body">
    <h5 class="card-title">Amy Coffee</h5>
    <p class="card-text mb-2">Some quick example text to build on the card title and make up the bulk of the card's content.
    </p>
    <a href="#" class="btn btn-primary">Read More</a>
  </div>
</div>