更改悬停CSS上的内容

Question

我想在悬停时更改列表内容，即罗马变为数字1,2,3

我尝试了li:hover li:hover:after，但两者都会添加内容和现有内容

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ul {
  min-height: 30px;
  width: 180px;
  margin-left:-30px;
  list-style-type: none;
  counter-reset: chrome-counter;
}

li:before {
  content: counter(chrome-counter, lower-roman);
  padding: 1px 2px;
  margin-right: 0.2em;
  font-weight: bold;
}

li {
  margin: 2px 0;
  padding: 1px 4px;
  font: normal bold 18px/32px  ms-sans, geneva, sans-serif;
  display: inline-block;
  width: 40px;
  text-align: center;
  color: #FFF;
  counter-increment: chrome-counter;
}

li:hover {
  padding: 4px 8px;
  color: #333;
  /*content : '..';*/
  counter-reset : counter(chrome-counter, upper-roman);
  box-shadow: 0px 0px 4px #222;
  border-radius: 1.5em .5em / 2.5em 2em;
}

.cc1 {
  background-color: #FF6766;
  color: #FFF;
}

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 <ul class="scheme">
      <li class="cc1" ></li>
     <li class="cc1" ></li>
     <li class="cc1" ></li>
</ul>

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Answer 1

使用此选择器：

li:hover:before {
    content: counter(chrome-counter, decimal);
}

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ul {
  min-height: 30px;
  width: 180px;
  margin-left:-30px;
  list-style-type: none;
  counter-reset: chrome-counter;
}

li:before {
  content: counter(chrome-counter, lower-roman);
  padding: 1px 2px;
  margin-right: 0.2em;
  font-weight: bold;
}

li {
  margin: 2px 0;
  padding: 1px 4px;
  font: normal bold 18px/32px  ms-sans, geneva, sans-serif;
  display: inline-block;
  width: 40px;
  text-align: center;
  color: #FFF;
  counter-increment: chrome-counter;
}

li:hover {
  padding: 4px 8px;
  color: #333;
  /*content : '..';*/
  counter-reset : counter(chrome-counter, upper-roman);
  box-shadow: 0px 0px 4px #222;
  border-radius: 1.5em .5em / 2.5em 2em;
  }

li:hover:before {
  content: counter(chrome-counter, decimal);
}

.cc1 {
  background-color: #FF6766;
  color: #FFF;
}

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<ul class="scheme">
      <li class="cc1" ></li>
     <li class="cc1" ></li>
     <li class="cc1" ></li>
</ul>

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Answer 2

如果您正在使用：before伪元素，则需要将所有状态应用于该确切元素...所以不应该对主元素应用，也不要对：after元素，而是需要的元素要更改，在您的情况下为li:before：

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ul {
  min-height: 30px;
  width: 180px;
  margin-left:-30px;
  list-style-type: none;
  counter-reset: chrome-counter;
}

li:before {
  content: counter(chrome-counter, lower-roman);
  padding: 1px 2px;
  margin-right: 0.2em;
  font-weight: bold;
}

li {
  margin: 2px 0;
  padding: 1px 4px;
  font: normal bold 18px/32px  ms-sans, geneva, sans-serif;
  display: inline-block;
  width: 40px;
  text-align: center;
  color: #FFF;
  counter-increment: chrome-counter;
}

li:hover {
  padding: 4px 8px;
  color: #333;
  /*content : '..';*/
  counter-reset : counter(chrome-counter, upper-roman);
  box-shadow: 0px 0px 4px #222;
  border-radius: 1.5em .5em / 2.5em 2em;
}

li:hover:before {
  content: counter(chrome-counter, upper-roman);
  padding: 1px 2px;
  margin-right: 0.2em;
  font-weight: bold;
}

.cc1 {
  background-color: #FF6766;
  color: #FFF;
}

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 <ul class="scheme">
     <li class="cc1" ></li>
     <li class="cc1" ></li>
     <li class="cc1" ></li>
</ul>

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以下是您在评论中要求更改为HTML内容的示例：

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ul {
  min-height: 30px;
  width: 180px;
  margin-left:-30px;
  list-style-type: none;
  counter-reset: chrome-counter;
}

li:before {
  content: counter(chrome-counter, lower-roman);
  padding: 1px 2px;
  margin-right: 0.2em;
  font-weight: bold;
}

li {
  margin: 2px 0;
  padding: 1px 4px;
  font: normal bold 18px/32px  ms-sans, geneva, sans-serif;
  display: inline-block;
  width: 40px;
  text-align: center;
  color: #FFF;
  counter-increment: chrome-counter;
}

li:hover {
  padding: 4px 8px;
  color: #333;
  /*content : '..';*/
  counter-reset : counter(chrome-counter, upper-roman);
  box-shadow: 0px 0px 4px #222;
  border-radius: 1.5em .5em / 2.5em 2em;
}

li:hover:before {
  content: "";
  padding: 1px 2px;
  margin-right: 0.2em;
  font-weight: bold;
}

li span {display: none}
li:hover span {display: initial}

.cc1 {
  background-color: #FF6766;
  color: #FFF;
}

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 <ul class="scheme">
      <li class="cc1" ><span>#</span></li>
     <li class="cc1" ><span>0</span></li>
     <li class="cc1" ><span>*</span></li>
</ul>

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