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javascript - 如何使用 CSS 使用重叠元素掩盖文本的可见性

问题描述

如果您看到下方提供的 GIF，则文本仅在越过黑点后才会出现。在那之前它是看不见的。这是使用 Flash 制作的，但我们如何使用 CSS 来实现呢？

标志 GIF

这是我到目前为止所得到的：

@import url("https://fonts.googleapis.com/css?family=Ubuntu+Mono");
body {
  height: 100vh;
  background: #222;
  padding: 0;
  margin: 0;
  font-family: "Ubuntu Mono";
}

.ypn-logo {
  background: green;
  display: flex;
  flex-direction: row;
  position: relative;
  align-items: center;
  justify-content: center;
  padding: 10px;
  width: 220px;
  height: 220px;
  border-radius: 220px;
  z-index: 1;
}

.ypn-text {
  font-size: 3.5em;
  color: white;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
  margin-left: -80px;
  z-index: 0;
}

.ypn-text:before {
  background: red;
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 180px;
  z-index: -1;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
  top: 30px;
  left: 10px;
}

.ypn-logo:hover>.ypn-text:before {
  left: 50px;
}

.ypn-text:after {
  background: #222;
  content: "";
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 180px;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
  top: 95px;
  left: 130px;
  z-index: 1;
}

.ypn-logo:hover>.ypn-text:after {
  left: 60px;
}

.ypn-logo:hover>.ypn-text {
  margin-left: 80px;
}
<div class="ypn-logo">
  <div class="ypn-text">RUN</div>
</div>

我想制作一个 div 并将其右边框与中间点的中心轴锁定，但这也隐藏了绿色和红色元素。有没有办法只阻止文本元素而不是其他元素？

@import url("https://fonts.googleapis.com/css?family=Ubuntu+Mono");
body {
  height: 100vh;
  background: #222;
  padding: 0;
  margin: 0;
  font-family: "Ubuntu Mono";
}

.ypn-logo {
  background: green;
  display: flex;
  flex-direction: row;
  position: relative;
  align-items: center;
  justify-content: center;
  padding: 10px;
  width: 220px;
  height: 220px;
  border-radius: 220px;
  z-index: 1;
}

.ypn-text {
  font-size: 3.5em;
  color: white;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
  margin-left: -80px;
  z-index: 0;
}

.ypn-before {
  background: red;
  content: "";
  position: absolute;
  width: 180px;
  height: 180px;
  border-radius: 180px;
  z-index: -1;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
  top: 30px;
  left: 10px;
}

.ypn-logo:hover>.ypn-before {
  left: 50px;
}

.ypn-after {
  background: #222;
  content: "";
  position: absolute;
  width: 50px;
  height: 50px;
  border-radius: 180px;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
  top: 95px;
  left: 130px;
  z-index: 1;
}

.ypn-logo:hover>.ypn-after {
  left: 60px;
}

.ypn-logo:hover>.ypn-text {
  margin-left: 80px;
}

.ypn-after:after {
  width: 130px;
  background: black;
  height: 3em;
  content: '';
  position: absolute;
  left: -100px;
}
<div class="ypn-logo">
  <div class="ypn-before"></div>
  <div class="ypn-text">YPN</div>
  <div class="ypn-after"></div>
</div>

标签： javascriptjqueryhtmlcss

解决方案

您可以使文本成为具有背景颜色的元素的子元素。然后通过创建一个带有一个点和一个设置为父级背景颜色的 div 的元素来制作蒙版。制作父母的overflow:hidden，以便在移动以揭开文本时看不到彩色区域。

$('.overlay').on('click', function() {
  $(this).toggleClass('hidden');
});

$(window).on('load', function() {
  $('.overlay').removeClass('hidden');
});
body {
  background: red;
}

.container {
  width: 80%;
  height: 60px;
  border-radius: 60px;
  background: white;
  overflow: hidden;
  margin: 20px auto;
  position: relative;
}

.overlay {
  width: 100%;
  height: 100%;
  background: white;
  transition: left 2s ease-out;
  position: absolute;
  top: 0;
  left: calc( -100% + 60px);
}

.overlay.hidden {
  left: 0;
}

.overlay::after {
  content: '';
  background: black;
  height: 60px;
  width: 60px;
  border-radius: 60px;
  position: absolute;
  right: 0;
  top: 0;
}

.text {
  font-size: 50px;
  line-height: 60px;
  width: 100%;
  text-align: center;
}

p {
text-align: center;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="container">
  <div class="text">ezoom</div>
  <div class="overlay hidden"></div>
</div>

<p> click the circle to toggle the animation</p>

编辑：
使用上述原理后，这是您需要的效果的最终代码：

@import url("https://fonts.googleapis.com/css?family=Ubuntu+Mono");
body {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 0;
  margin: 0;
  background: #222;
  font-family: "Ubuntu Mono";
}

.ypn-logo {
  background: green;
  display: flex;
  flex-direction: row;
  position: relative;
  align-items: center;
  justify-content: center;
  padding: 10px;
  width: 220px;
  height: 220px;
  border-radius: 220px;
}

.ypn-before {
  background: red;
  content: '';
  overflow: hidden;
  width: 180px;
  height: 180px;
  border-radius: 180px;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  position: relative;
  left: -20px;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
}

.ypn-text {
  background: none;
  position: absolute;
  left: 20px;
  font-size: 3.2em;
  color: #ddd;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
}

.ypn-dot {
  width: 200px;
  height: 200px;
  position: relative;
  background: red;
  left: -35px;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
}

.ypn-dot:after {
  content: '';
  position: absolute;
  background: #222;
  width: 60px;
  height: 60px;
  border-radius: 60px;
  top: 70px;
  right: -25px;
  transition: all 1s cubic-bezier(0.86, 0, 0.07, 1);
}

.ypn-logo:hover>.ypn-before {
  left: 20px;
}

.ypn-logo:hover>.ypn-before .ypn-dot {
  left: -135px;
}

.ypn-logo:hover>.ypn-before .ypn-text {
  left: 80px;
}
<div class="ypn-logo">
  <div class="ypn-before">
    <div class="ypn-text">RUN</div>
    <div class="ypn-dot"></div>
  </div>
</div>

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