此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，并使用线性渐变百分比调整比例。在此示例中，我有一条虚线为1px的点，间距为2px。这样，您也可以使用多个背景使用多个虚线边框。
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>
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