html - 我将如何使用::after 在我的按钮上制作箭头？

Question

我可以像这样创建一个右侧带有箭头的按钮:

.next-button {
    font-family: 'Source Sans Pro', Arial, Helvetica, sans-serif;
    text-decoration: none;
    color: #fff;
    text-align: center;
    border: none;
    background-color: #2399e5;
    display: inline-block;
    height: 36px;
    line-height: 36px;
    padding: 0 1rem;
}

.next-point{
    vertical-align: top;
    width: 0;
    height: 0;
    display: inline-block;
    border-top: 18px solid transparent;
    border-bottom: 18px solid transparent;
    
    border-left: 18px solid #2399e5;
    border-right: 18px solid transparent;
}

<div>
<button class="next-button" type="button">Next</button><div class="next-point"></div>
</div>

...但是如果我尝试使用::after 来完成它，它就不会成功。以下是我的尝试:

.next-button {
    font-family: 'Source Sans Pro', Arial, Helvetica, sans-serif;
    text-decoration: none;
    color: #fff;
    text-align: center;
    border: none;
    background-color: #2399e5;
    display: inline-block;
    height: 36px;
    line-height: 36px;
    padding: 0 1rem;
}

.next-button::after{
    content: " ";
    vertical-align: top;
    width: 0;
    height: 0;
    display: inline-block;
    border-top: 18px solid transparent;
    border-bottom: 18px solid transparent;
    
    border-left: 18px solid #2399e5;
    border-right: 18px solid transparent;
}

<div>
<button class="next-button" type="button">Next</button>
</div>

我已经研究了好一阵子了，显然我不完全理解如何使用 ::after。我如何使用 ::after 而不是创建单独的 div 来完成我的第一个代码片段中的按钮外观？

Answer 1

伪元素是 .next-button 元素的子元素，因此它显示在按钮内。您可以使用绝对位置将其显示在按钮外，并且 right 等于减去伪元素宽度(width = 36px -> right = -36px)。

.next-button {
  position: relative;
  font-family: 'Source Sans Pro', Arial, Helvetica, sans-serif;
  text-decoration: none;
  color: #fff;
  text-align: center;
  border: none;
  background-color: #2399e5;
  display: inline-block;
  height: 36px;
  line-height: 36px;
  padding: 0 1rem;
}

.next-button::after {
  position: absolute;
  content: "";
  top: 0;
  right: -36px;
  width: 0;
  height: 0;
  display: inline-block;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-left: 18px solid #2399e5;
  border-right: 18px solid transparent;
}

<div>
  <button class="next-button" type="button">Next</button>
</div>

另一种选择是绝对定位在右侧的元素内，并使用 translateX(100%) 将其推到外面。

.next-button {
  position: relative;
  font-family: 'Source Sans Pro', Arial, Helvetica, sans-serif;
  text-decoration: none;
  color: #fff;
  text-align: center;
  border: none;
  background-color: #2399e5;
  display: inline-block;
  height: 36px;
  line-height: 36px;
  padding: 0 1rem;
}

.next-button::after {
  position: absolute;
  content: "";
  top: 0;
  right: 0;
  transform: translateX(100%);
  width: 0;
  height: 0;
  display: inline-block;
  border-top: 18px solid transparent;
  border-bottom: 18px solid transparent;
  border-left: 18px solid #2399e5;
  border-right: 18px solid transparent;
}

<div>
  <button class="next-button" type="button">Next</button>
</div>