sass和stylus1px解决方案

 1 @charset "utf-8";
 2 /**
 3  * @module 背景与边框
 4  * @description 为元素添加边框（包括1px边框）
 5  * @method border
 6  * @version 2.0.0
 7  * @param {String} $border-width 指定边框厚度（单位为px），默认值：1px，取值与`border-width`属性一致，不同方向代表边框位置 <2.0.0>
 8  * @param {String} $border-color 指定边框颜色 <2.0.0>
 9  * @param {String} $border-style 指定边框样式 <2.0.0>
10  * @param {String} $radius 指定边框圆角半径，默认值：null <2.0.0>
11  */
12 @mixin border($border-width: 1px, $border-color: map-get($base, border-color), $border-style: solid, $radius: null) {
13     // 为边框位置提供定位参考
14     position: relative;
15     @if $border-width == null {
16         $border-width: 0;
17     }
18     border-radius: $radius;
19     &::after {
20         // 用以解决边框layer遮盖内容
21         pointer-events: none;
22         position: absolute;
23         z-index: 999;
24         top: 0;
25         left: 0;
26         // fix当元素宽度出现小数时，边框可能显示不全的问题
27         // overflow: hidden;
28         content: "\0020";
29         border-color: $border-color;
30         border-style: $border-style;
31         border-width: $border-width;
32         // 适配dpr进行缩放
33         @include responsive(retina1x) {
34             width: 100%;
35             height: 100%;
36             @if $radius != null {
37                 border-radius: $radius;
38             }
39         }
40         @include responsive(retina2x) {
41             width: 200%;
42             height: 200%;
43             @include transform(scale(.5));
44             @if $radius != null {
45                 border-radius: $radius * 2;
46             }
47         }
48         @include responsive(retina3x) {
49             width: 300%;
50             height: 300%;
51             @include transform(scale(.33333));
52             @if $radius != null {
53                 border-radius: $radius * 3;
54             }
55         }
56         @include transform-origin(0 0);
57     }
58 }

border($border-width = 1px, $border-color = #ccc, $border-style = solid, $radius = 0)
  // 为边框位置提供定位参考
  position: relative;

  if $border-width == null
    $border-width: 0;

  border-radius: $radius;

  &::after
    // 用以解决边框layer遮盖内容
    pointer-events: none;
    position: absolute;
    z-index: 999;
    top: 0;
    left: 0;
    // fix当元素宽度出现小数时，边框可能显示不全的问题
    // overflow: hidden;
    content: "\0020";
    border-color: $border-color;
    border-style: $border-style;
    border-width: $border-width;
    
    // 适配dpr进行缩放
    @media (max--moz-device-pixel-ratio: 1.49), (-webkit-max-device-pixel-ratio: 1.49), (max-device-pixel-ratio: 1.49), (max-resolution: 143dpi), (max-resolution: 1.49dppx)
      width: 100%;
      height: 100%;
      if $radius != null {
        border-radius: $radius;
      }
    
    @media (min--moz-device-pixel-ratio: 1.5) and (max--moz-device-pixel-ratio: 2.49), (-webkit-min-device-pixel-ratio: 1.5) and (-webkit-max-device-pixel-ratio: 2.49),(min-device-pixel-ratio: 1.5) and (max-device-pixel-ratio: 2.49),(min-resolution: 144dpi) and (max-resolution: 239dpi),(min-resolution: 1.5dppx) and (max-resolution: 2.49dppx)
      width: 200%;
      height: 200%;
      transform: scale(.5)
      if $radius != null {
        border-radius: $radius * 2;
      }
    
    @media (min--moz-device-pixel-ratio: 2.5), (-webkit-min-device-pixel-ratio: 2.5),(min-device-pixel-ratio: 2.5), (min-resolution: 240dpi),(min-resolution: 2.5dppx)
      width: 300%;
      height: 300%;
      transform: scale(.33333)
      if $radius != null {
        border-radius: $radius * 3;
      }

    transform-origin: 0 0;