使用 CSS3 动画和 Sass @for 循环触发列表

Triggering a list with CSS3 animations and Sass @for loop

我正在尝试使用 for 循环在 Sass 中创建关键帧动画,但我在编写它时遇到了困难。我想要的是让每个项目一个接一个地出现,但稍有延迟。有点像一堆卡片。

这是一个codepen。这是代码:

<ul>
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  <li><a href="#Contact">Contact</a></li>
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</ul>
html {
  font-size: 62.5%;
   box-zising: border-box;
}

*,
*:before,
*:after {
  box-zising: inherit;
}

html, body {
  width: 100vw;
  height: 100vh;
  background: black;
  font-size: 1rem;
}


ul {
  position: fixed;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid white;
  width: 100vw;
  height: 100vh;
}

li {
  list-style: none;
  border: 1px solid white;
  width: 100%;
  text-align: center;
  margin-top: 10px;
  background: red;

  @for $i from 1 through 4 {
    &:nth-of-type(#{$i}) {
      animation: slideTop;
      animation-duration: 1.5s + (40ms * $i);
      animation-iteration-count: 5;
      animation-delay: 2.5s + (40ms * $i);
    }
  }

  a {
    display: block;
    padding: 50px;
    color: white;
    font-size: 24px;
    text-decoration: none;
    letter-spacing: 0.1em;
  }
}


@keyframes slideTop {
  0% {
    opacity: 0;
    transform: scaleY(0);
  }
  100% {
    opacity: 1;
    transform: scaleY(50px);
  }
}

看这里 > jsfiddle

你必须设置一个更大的 animation-delay 这样你才能看到 li 一个接一个地出现

并且您必须将 opacity:0animation-fill-more:forwards 一起设置,因此起初 li 被隐藏,然后它们出现并与 opacity:1 保持一致

让我知道这是否是您要找的东西

代码:

(代码段不起作用,因为它没有 SASS;我只是把它放在网站上,以便代码在此处可见)

html {
  font-size: 62.5%;
   box-zising: border-box;
}

*,
*:before,
*:after {
  box-zising: inherit;
}

html, body {
  width: 100vw;
  height: 100vh;
  background: black;
  font-size: 1rem;
}


ul {
  position: fixed;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  border: 1px solid white;
  width: 100vw;
  height: 100vh;
}

li {
  list-style: none;
  border: 1px solid white;
  width: 100%;
  text-align: center;
  margin-top: 10px;
  background: red;
  opacity:0;
  @for $i from 1 through 4 {
    &:nth-child(#{$i}) {
      animation: slideTop;
      animation-duration: 1s + ($i*400ms);
      animation-iteration-count: 1;
      animation-delay: 2.5s + ($i*400ms);
      animation-fill-mode:forwards;
    }
  }
  a {
    display: block;
    padding: 50px;
    color: white;
    font-size: 24px;
    text-decoration: none;
    letter-spacing: 0.1em;
  }
}


@keyframes slideTop {
  0% {
    opacity: 0;
    transform: scaleY(0);
  }
  100% {
    opacity: 1;
    transform: scaleY(50px);
  }
}
<ul>
  <li><a href="#About">About</a></li>
  <li><a href="#Contact">Contact</a></li>
  <li><a href="Labs">Labs</a></li>
</ul>