html - 如何增加虚线边框点之间的空间

Question

我在我的框中使用虚线样式边框，例如

.box {
    width: 300px;
    height: 200px;
    border: dotted 1px #f00;
    float: left;
}

我想增加边框每个点之间的间距。

Answer 1

这个技巧适用于水平和垂直边框:

/*Horizontal*/
background-image: linear-gradient(to right, black 33%, rgba(255,255,255,0) 0%);
background-position: bottom;
background-size: 3px 1px;
background-repeat: repeat-x;

/*Vertical*/
background-image: linear-gradient(black 33%, rgba(255,255,255,0) 0%);
background-position: right;
background-size: 1px 3px;
background-repeat: repeat-y;

您可以使用背景大小调整大小，使用线性渐变百分比调整比例。在这个例子中，我有一条 1px 点和 2px 间距的虚线。这样，您也可以使用多个背景来拥有多个虚线边框。

试试这个JSFiddle或者看一下代码片段示例:

div {
  padding: 10px 50px;
}
.dotted {
  border-top: 1px #333 dotted;
}
.dotted-gradient {
  background-image: linear-gradient(to right, #333 40%, rgba(255, 255, 255, 0) 20%);
  background-position: top;
  background-size: 3px 1px;
  background-repeat: repeat-x;
}
.dotted-spaced {
  background-image: linear-gradient(to right, #333 10%, rgba(255, 255, 255, 0) 0%);
  background-position: top;
  background-size: 10px 1px;
  background-repeat: repeat-x;
}
.left {
  float: left;
  padding: 40px 10px;
  background-color: #F0F0DA;
}
.left.dotted {
  border-left: 1px #333 dotted;
  border-top: none;
}
.left.dotted-gradient {
  background-image: linear-gradient(to bottom, #333 40%, rgba(255, 255, 255, 0) 20%);
  background-position: left;
  background-size: 1px 3px;
  background-repeat: repeat-y;
}
.left.dotted-spaced {
  background-image: linear-gradient(to bottom, #333 10%, rgba(255, 255, 255, 0) 0%);
  background-position: left;
  background-size: 1px 10px;
  background-repeat: repeat-y;
}

<div>no
  <br>border</div>
<div class='dotted'>dotted
  <br>border</div>
<div class='dotted-gradient'>dotted
  <br>with gradient</div>
<div class='dotted-spaced'>dotted
  <br>spaced</div>

<div class='left'>no
  <br>border</div>
<div class='dotted left'>dotted
  <br>border</div>
<div class='dotted-gradient left'>dotted
  <br>with gradient</div>
<div class='dotted-spaced left'>dotted
  <br>spaced</div>