stylus实现边框1px

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

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

  border-radius: $radius;

  &::after
    // 用以解决边框layer遮盖内容
    pointer-events: none;
    position: absolute;
    z-index: ;
    top: ;
    left: ;
    // 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: .49dppx)
      width: %;
      height: %;
      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: .5dppx) and (max-resolution: .49dppx)
      width: %;
      height: %;
      transform: scale(.)
      if $radius != null {
        border-radius: $radius * ;
      }

    @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: .5dppx)
      width: %;
      height: %;
      transform: scale(.)
      if $radius != null {
        border-radius: $radius * ;

    transform-origin:  ;