在悬停时进出动画

Question

我试图像这里的效果一样制作删除线动画：

点击线从左到右显示 ，从从左到右消失。

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@keyframes strike {
  0% {
    width: 0;
  }
  50% {
    width: 100%;
  }
  100% {
    width: 0;
  }
}

.strike {
  position: relative;
}

.strike:hover:after {
  content: ' ';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: black;
  animation-name: strike;
  animation-duration: 1s;
  animation-timing-function: linear;
  animation-iteration-count: 1;
  animation-fill-mode: fill;
  animation-direction: normal;
}

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<div>
  The text in the span <span class="strike">is what I want to strike out</span>.
</div>

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有没有办法只用 CSS 来实现？

Answer 1

您可以在关键帧动画中使用变换和变换原点，使从左到右突破apear，从左到右消失。
关键是要将X轴上的伪元素缩放为0到1，左边是变换原点，然后是右边的变换原点返回0（类似于此hover effect，请参见答案的最后一个示例）

以下是您的标记示例：

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@keyframes strike{
  0%     { transform-origin:  0% 50%;transform:scaleX(0); }
  50%    { transform-origin:  0% 50%;transform:scaleX(1);  }
  50.01% { transform-origin:100% 50%;transform:scaleX(1);  }
  100%   { transform-origin:100% 50%;transform:scaleX(0);  }
}
.strike {
  position: relative;
}
.strike:hover:after {
  content: ' ';
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 1px;
  background: black;
  animation: strike .75s ease-in-out forwards;
}

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<div>
    The text in the span <span class="strike">is what I want to strike out</span>.
</div>

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Answer 2

以下是使用transition的示例，其中鼠标悬停切换左/右位置。

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.strike {
  position: relative;
}
.strike::after {
  content: ' ';
  position: absolute;
  top: 50%;
  left: 0;
  right: 100%;
  height: 1px;
  background: black;
}
.strike:hover::after {
  right: 0;
  left: 100%;
  transition: right .5s .0s, left .5s .5s;  
}

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<div>
  The text in the span <span class="strike">is what I want to strike out</span>.
</div>

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