悬停进出

Question

使用以下代码，我从左到右得到悬停下划线效果。

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.underline {
  display: inline;
  position: relative;
  overflow: hidden;
}
.underline:after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  right: 100%;
  bottom: -5px;
  background: #000;
  height: 4px;
  transition-property: left right;
  transition-duration: 0.3s;
  transition-timing-function: ease-out;
}
.underline:hover:after,
.underline:focus:after,
.underline:active:after {
  right: 0;
}

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<p>hello, link is <a href="#" class="underline">underline</a>
</p>

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当你没有悬停时，：after元素返回到左边的初始状态。当你离开悬停时，有没有办法：在右边之后而不是在左边？

Answer 1

您可以尝试动画宽度而不是右/左属性。

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.underline {
  display: inline;
  position: relative;
  overflow: hidden;
}
.underline:after {
  content: "";
  position: absolute;
  z-index: -1;
  right: 0;
  width: 0;
  bottom: -5px;
  background: #000;
  height: 4px;
  transition-property: width;
  transition-duration: 0.3s;
  transition-timing-function: ease-out;
}
.underline:hover:after,
.underline:focus:after,
.underline:active:after {
  left: 0;
  right: auto;
  width: 100%;
}

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<p>hello, link is <a href="#" class="underline">underline</a></p>

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请参阅此小提琴，了解一个工作示例：https://jsfiddle.net/1gyksyoa/

Answer 2

根据以下答案：Expand bottom border on hover您可以在悬停时更改transform-origin属性以实现“悬停”  你正在寻找的效果。这是一个例子：

.expand{
  position:relative;
  text-decoration:none;
  display:inline-block;
}
.expand:after {
  display:block;
  content: '';
  border-bottom: solid 3px #000;  
  transform: scaleX(0);  
  transition: transform 250ms ease-in-out;
  transform-origin:100% 50%
}
.expand:hover:after { 
  transform: scaleX(1);
  transform-origin:0 50%;
}

Here is some dummy text <a href="#" class="expand">expand</a>