如何在移动端做出1px边框的效果

border-1px($color)  position: relative
  &:after
    display: block    position: absolute    left: 0
    bottom: 0
    width: 100%
    border-top: 1px solid $color    content: ' '

@media (-webkit-min-device-pixel-ratio: 1.5),(min-device-pixel-ratio: 1.5)
  .border-1px
    &::after
      -webkit-transform: scaleY(0.7)      transform: scaleY(0.7)
@media (-webkit-min-device-pixel-ratio: 2),(min-device-pixel-ratio: 2)
  .border-1px
    &::after
      -webkit-transform: scaleY(0.5)      transform: scaleY(0.5)