我希望頁(yè)面內(nèi)容在向下滾動(dòng)時(shí)淡入，在向上滾動(dòng)時(shí)淡出，我使用了網(wǎng)站說(shuō)明（https://www.superhi.com/blog/how-to-add-web-design-elements-that -fade-in-and-out-on-scroll），并嘗試對(duì)其進(jìn)行一些更改以適合我的項(xiàng)目，但無(wú)法正常工作。我正在使用Dreamweaver。<script src="jquery-3.4.1.min.js"></script> <script src="fadein.js"></script>   <script>$(document).on("scroll", function () {  var pageTop = $(document).scrollTop()  var pageBottom = pageTop + $(window).height()  var tags = $(".fade")  for (var i = 0; i < tags.length; i++) {    var tag = tags[i]    if ($(tag).position().top < pageBottom) {      $(tag).addClass("visible")    } else {      $(tag).removeClass("visible")    }  }})</script>   <div id="content" style="margin:-8px;">    <img src="images/n intro.jpg" style="width: 100%; margin-top:110px;" alt="intro image">    <img class="fade" src="images/border.png" style="width:490px;  margin:40px; margin-left: 35%" alt="border line">    <div id="mid">    <h1  class="fade">Whether youre in it for...</h1>    <img class="fade" src="images/photos/food&drink2.jpg" alt="picture of artistic coffee being made">      <p class="fade">The food and drink,</p>    <img class="fade" src="images/photos/work2.jpg" alt="picture of laptop at a coffee table">    <p class="fade">Getting some work done,</p>    <img class="fade" src="images/photos/people2.jpg" alt="picture of a couples hands holding coffee">    <p class="fade">The people,</p>    <img class="fade" src="images/photos/book2.jpg" alt="picture of a book and coffee">    <p class="fade">Or a good book,</p>    <h2 class="fade">We got you covered!</h2>    </div>當(dāng)我使用此頁(yè)面時(shí)，該頁(yè)面只會(huì)正常顯示所有內(nèi)容，沒(méi)有任何東西褪色或不可見(jiàn)。