jquery - 可见性 "animation"但 SCSS 中的反向效果有延迟

Question

我正在创建一个最初想要隐藏的元素，但是当添加一个类时，它将出现并为顶部设置动画。这样做的问题是，在类删除时，可见性会立即触发，然后顶部会进行动画处理。在 SCSS 中，如何确保类删除、可见性直到顶部动画之后才生效？

$(window).on("load", function(){
  $("button").click(function(){
    $(".nav-slider").toggleClass("is_visible");
  });
});

.nav-slider {
  position:fixed;
  top:-100%;
  left:0;
  width:100%;
  height:calc(100% - 60px);
  background-color:$white;
  z-index:1;
  visibility:hidden;
  transition:top 0.2s, visibility 0s;
  -o-transition:top 0.2s, visibility 0s;
  -ms-transition:top 0.2s, visibility 0s;
  -moz-transition:top 0.2s, visibility 0s;
  -webkit-transition:top 0.2s, visibility 0s;
  padding-top:40px;
}

.nav-slider.is_visible {
  top:60px;
  visibility: visible;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="nav-slider">
test
</div>

<button>slider</button>

Answer 1

您可以对 .is_visible 进行不同的转换

$(window).on("load", function() {
  $("button").click(function() {
    $(".nav-slider").toggleClass("is_visible");
  });
});

.nav-slider {
  position: fixed;
  top: -100%;
  left: 0;
  width: 100%;
  height: calc(100% - 60px);
  background-color: $white;
  z-index: 1;
  visibility: hidden;
  padding-top: 40px;
  transition: top 2s, visibility 2s;
}

.nav-slider.is_visible {
  transition: top 2s, visibility 0s;
  top: 60px;
  visibility: visible;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="nav-slider">
  test
</div>

<button>slider</button>