html - 如何制作一个悬停动画的按钮，就像在 Airforce.com 上找到的按钮一样

Question

如何使按钮在悬停时具有动画效果，就像此 GIF 中的按钮或 airforce.com 中的按钮一样.

Answer 1

这是一个具有一个元素和多个背景的想法:

.box {
  display:inline-block;
  padding:10px 20px;
  border-right:1px solid;
  border-left:1px solid;
  background:
      linear-gradient(#000,#000) top left,
      linear-gradient(#000,#000) top right,
      linear-gradient(#000,#000) bottom right,
      linear-gradient(#000,#000) bottom left;
  background-size:15% 1px,75% 1px;
  background-repeat:no-repeat;
  transition:.8s all;
}
.box:hover {
  background-size:75% 1px,15% 1px;
}

<div class="box">
  some text
</div>

<div class="box">
  more and more text
</div>

如果你想固定空白，你可以调整background-size。这是一个 10px 的示例，透明部分从边缘 10px 开始。

.box {
  display:inline-block;
  padding:10px 20px;
  border-right:1px solid;
  border-left:1px solid;
  background:
      linear-gradient(#000,#000) top left,
      linear-gradient(#000,#000) top right,
      linear-gradient(#000,#000) bottom right,
      linear-gradient(#000,#000) bottom left;
  background-size:10px 1px,calc(100% - 20px) 1px;
  background-repeat:no-repeat;
  transition:.8s all;
}
.box:hover {
  background-size:calc(100% - 20px) 1px,10px 1px;
}

<div class="box">
  some text
</div>

<div class="box">
  more and more text
</div>

还有一个渐变的想法:

.box {
  display:inline-block;
  padding:10px 20px;
  border-right:1px solid;
  border-left:1px solid;
  background:
      linear-gradient(to right,
        #000 calc(50% - 5px),transparent calc(50% - 5px),
        transparent calc(50% + 5px),#000 calc(50% + 5px)),
      linear-gradient(to right,
        #000 calc(50% - 5px),transparent calc(50% - 5px),
        transparent calc(50% + 5px),#000 calc(50% + 5px));       
  background-size:150% 1px;
  background-position:top left,bottom right;
  background-repeat:no-repeat;
  transition:.8s all;
}
.box:hover {
  background-position:top right,bottom left;
}

<div class="box">
  some text
</div>

<div class="box">
  more and more text
</div>