CSS -为li提供边界

Question

我在试着给我的列表加上边界。我使用li来实现这一点。我已经创建了一些东西，我已经在上面附加了它，你可以检查一下。我使用了额外的div，但我需要删除所有额外的div，并且只需要使用css就可以给出这样的边框。我们能做到吗？

​

.counter {
  position: relative;
  max-width: 600px;
}

.counter ul {
  display: inline-block;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
}

.counter li {
  float: left;
  width: 33.33%;
  height: 100px;
}

.counter li .c-grid {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  align-content: stretch;
  height: 100%;
  width: 100%;
}

.line-1 {
  height: 1px;
  width: 100%;
  background: #000;
  position: absolute;
  left: 0;
  right: 0;
  top: 65%;
}

.line-2 {
  height: 1px;
  width: 100%;
  background: #000;
  position: absolute;
  left: 0;
  right: 0;
  top: 35%;
}

.line-3 {
  height: 100%;
  width: 1px;
  background: #000;
  position: absolute;
  right: 35%;
  top: 0;
  bottom: 0;
}

.line-4 {
  height: 100%;
  width: 1px;
  background: #000;
  position: absolute;
  right: 65%;
  top: 0;
  bottom: 0;
}

<div class="counter">
  <div class="line-1"></div>
  <div class="line-2"></div>
  <div class="line-3"></div>
  <div class="line-4"></div>
  <ul>
    <li>
      <div class="c-grid"> 1 </div>
    </li>
    <li>
      <div class="c-grid"> 2 </div>
    </li>
    <li>
      <div class="c-grid"> 3 </div>
    </li>
    <li>
      <div class="c-grid"> 4 </div>
    </li>
    <li>
      <div class="c-grid"> 5 </div>
    </li>
    <li>
      <div class="c-grid"> 6 </div>
    </li>
    <li>
      <div class="c-grid"> 7 </div>
    </li>
    <li>
      <div class="c-grid"> 8 </div>
    </li>
    <li>
      <div class="c-grid"> 9 </div>
    </li>
  </ul>
</div>

​

Answer 1

添加list-style-position:inside;

.borderlist {
list-style-position:inside;
border: 1px solid black;

}

Answer 2

在这里，我删除了四行div行，并使用了li边框，您可以在其中添加尽可能多的行，并且它将继续跟随还添加了box-sizing: border-box;，以避免网格中断

​

* {
  box-sizing: border-box;
}
.counter {
  position: relative;
  max-width: 600px;
}

.counter ul {
  display: inline-block;
  max-width: 600px;
  margin: 0 auto;
  width: 100%;
  padding: 0;
}

.counter li {
  float: left;
  width: 33.33333%;
  height: 100px;
}

.counter li .c-grid {
  display: flex;
  flex-direction: row;
  flex-wrap: nowrap;
  justify-content: center;
  align-items: center;
  align-content: stretch;
  height: 100%;
  width: 100%;
}

li {
  border-right: 1px solid #000;
  border-bottom: 1px solid #000;
}

li:nth-child(3n) {
  border-right: none;
}

li:nth-last-child(-n+3),
li:nth-last-child(-n+2),
li:last-child {
  border-bottom: none;
}

<div class="counter">
  <ul>
    <li>
      <div class="c-grid"> 1 </div>
    </li>
    <li>
      <div class="c-grid"> 2 </div>
    </li>
    <li>
      <div class="c-grid"> 3 </div>
    </li>
    <li>
      <div class="c-grid"> 4 </div>
    </li>
    <li>
      <div class="c-grid"> 5 </div>
    </li>
    <li>
      <div class="c-grid"> 6 </div>
    </li>
    <li>
      <div class="c-grid"> 7 </div>
    </li>
    <li>
      <div class="c-grid"> 8 </div>
    </li>
    <li>
      <div class="c-grid"> 9 </div>
    </li>
  </ul>
</div>

​

Answer 3

最简单的方法是使用带有一些nth-child边框样式的CSS Grid。使用这种方法，我们可以删除：

不必要的<div>s

• floats

• redundant样式

​

html, body, ul {
  margin: 0;
  padding: 0;
}

ul {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
}

ul > li {
  padding: 20px 15px;
  text-align: center;
}

/* First 6 items */
ul > li:nth-child(-n + 6)  {
  border-bottom: 1px solid black;
}

/* Every 3rd item, starting from the 2nd item */
ul > li:nth-child(3n + 2) {
  border-left: 1px solid black;
  border-right: 1px solid black;  
}

<ul>
  <li>1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
  <li>5</li>
  <li>6</li>
  <li>7</li>
  <li>8</li>
  <li>9</li>
</ul>

​

​

​

https://jsfiddle.net/2hg9zr4q/3/