1px问题

.min-device-pixel-ratio(@scale2, @scale3) {
  @media screen and (min-device-pixel-ratio: 2), (-webkit-min-device-pixel-ratio: 2) {
    transform: @scale2;
  }
  @media screen and (min-device-pixel-ratio: 3), (-webkit-min-device-pixel-ratio: 3) {
    transform: @scale3;
  }
}

.border-1px(@color: #DDD, @radius: 2PX, @style: solid) {
  &::before {
    content: "";
    pointer-events: none;
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    transform-origin: 0 0;
    border: 1PX @style @color;
    border-radius: @radius;
    box-sizing: border-box;
    width: 100%;
    height: 100%;
    @media screen and (min-device-pixel-ratio: 2), (-webkit-min-device-pixel-ratio: 2) {
      width: 200%;
      height: 200%;
      border-radius: @radius * 2;
      transform: scale(.5);
    }
    @media screen and (min-device-pixel-ratio: 3), (-webkit-min-device-pixel-ratio: 3) {
      width: 300%;
      height: 300%;
      border-radius: @radius * 3;
      transform: scale(.33);
    }
  }
}

.border-top-1px(@color: #DDD, @style: solid) {
  &::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    border-top: 1Px @style @color;
    transform-origin: 0 0;
    .min-device-pixel-ratio(scaleY(.5), scaleY(.33));
  }
}
.border-bottom-1px(@color: #DDD, @style: solid) {
  &::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 100%;
    border-bottom: 1Px @style @color;
    transform-origin: 0 0;
    .min-device-pixel-ratio(scaleY(.5), scaleY(.33));
  }
}
.border-left-1px(@color: #DDD, @style: solid) {
  &::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    border-left: 1Px @style @color;
    transform-origin: 0 0;
    .min-device-pixel-ratio(scaleX(.5), scaleX(.33));
  }
}