反向过渡不适用于导航

问题描述

我已根据位置构建了一个过渡。在反向滚动中，我通过JS添加了 .scroll-stick-nav 类，并在滚动淹没时将其删除。班级出现时过渡有效，但班级消失则时间过渡无效。导航突然消失，没有任何过渡。下面的代码。

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

  if ($('#cst-navbar').length > 0) {
    //if its cst landing page
    if (scroll > position) {
      $(".navbar").removeClass("scroll-stick-nav");
      $(".navbar").addClass("smooth-scroll");
    } else if (scroll < 100) {
      $(".navbar").removeClass("scroll-stick-nav");
      $(".navbar").removeClass("smooth-scroll");
    } else {
      $(".navbar").addClass("scroll-stick-nav");
      $(".navbar").removeClass("smooth-scroll");
    }
    position = scroll;
  } else {
    //if its other internal pages
    if (scroll > 0) {
      $(".navbar").addClass("scroll-stick-nav");
    } else {
      $(".navbar").removeClass("scroll-stick-nav");
    }
  }
});

* {
  margin: 0;
}

p {
  font-size: 25px;
  margin-bottom: 30px;
}

.navbar {
  background-color: orange;
  padding: 20px;
  transition: top .2s linear !important;
}

.scroll-stick-nav {
  position: fixed !important;
  width: 100%;
  top: 0;
}

.smooth-scroll {
  top: -63px;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="cst-navbar">
  <header class="navbar">
    navigation
  </header>

  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,when an unknown printer took a galley of type and scrambled it to make a type specimen book. It
    has survived not only five centuries,but also the leap into electronic typesetting,remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages,and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>

  <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s,and more recently with desktop
    publishing software like Aldus PageMaker including versions of Lorem Ipsum.</p>
</div>

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）