css的border一像素

@charset “utf-8”;
.border,
.border-top,
.border-right,
.border-bottom,
.border-left,
.border-topbottom,
.border-rightleft,
.border-topleft,
.border-rightbottom,
.border-topright,
.border-bottomleft {
position: relative;
}
.border::before,
.border-top::before,
.border-right::before,
.border-bottom::before,
.border-left::before,
.border-topbottom::before,
.border-topbottom::after,
.border-rightleft::before,
.border-rightleft::after,
.border-topleft::before,
.border-topleft::after,
.border-rightbottom::before,
.border-rightbottom::after,
.border-topright::before,
.border-topright::after,
.border-bottomleft::before,
.border-bottomleft::after {
content: “\\0020”;
overflow: hidden;
position: absolute;
}
/* border

• 因，边框是由伪元素区域遮盖在父级
• 故，子级若有交互，需要对子级设置
• 定位 及 z轴
  /
  .border::before {
  box-sizing: border-box;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  border: 1px solid #eaeaea;
  transform-origin: 0 0;
  }
  .border-top::before,
  .border-bottom::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-topleft::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-bottomleft::before {
  left: 0;
  width: 100%;
  height: 1px;
  }
  .border-right::before,
  .border-left::before,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-topright::after,
  .border-bottomleft::after {
  top: 0;
  width: 1px;
  height: 100%;
  }
  .border-top::before,
  .border-topbottom::before,
  .border-topleft::before,
  .border-topright::before {
  border-top: 1px solid #eaeaea;
  transform-origin: 0 0;
  }
  .border-right::before,
  .border-rightbottom::before,
  .border-rightleft::before,
  .border-topright::after {
  border-right: 1px solid #eaeaea;
  transform-origin: 100% 0;
  }
  .border-bottom::before,
  .border-topbottom::after,
  .border-rightbottom::after,
  .border-bottomleft::before {
  border-bottom: 1px solid #eaeaea;
  transform-origin: 0 100%;
  }
  .border-left::before,
  .border-topleft::after,
  .border-rightleft::after,
  .border-bottomleft::after {
  border-left: 1px solid #eaeaea;
  transform-origin: 0 0;
  }
  .border-top::before,
  .border-topbottom::before,
  .border-topleft::before,
  .border-topright::before {
  top: 0;
  }
  .border-right::before,
  .border-rightleft::after,
  .border-rightbottom::before,
  .border-topright::after {
  right: 0;
  }
  .border-bottom::before,
  .border-topbottom::after,
  .border-rightbottom::after,
  .border-bottomleft::after {
  bottom: 0;
  }
  .border-left::before,
  .border-rightleft::before,
  .border-topleft::after,
  .border-bottomleft::before {
  left: 0;
  }
  @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) {
  / 默认值，无需重置 */
  }
  @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) {
  .border::before {
  width: 200%;
  height: 200%;
  transform: scale(.5);
  }
  .border-top::before,
  .border-bottom::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-topleft::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-bottomleft::before {
  transform: scaleY(.5);
  }
  .border-right::before,
  .border-left::before,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-topright::after,
  .border-bottomleft::after {
  transform: scaleX(.5);
  }
  }
  @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) {
  .border::before {
  width: 300%;
  height: 300%;
  transform: scale(.33333);
  }
  .border-top::before,
  .border-bottom::before,
  .border-topbottom::before,
  .border-topbottom::after,
  .border-topleft::before,
  .border-rightbottom::after,
  .border-topright::before,
  .border-bottomleft::before {
  transform: scaleY(.33333);
  }
  .border-right::before,
  .border-left::before,
  .border-rightleft::before,
  .border-rightleft::after,
  .border-topleft::after,
  .border-rightbottom::before,
  .border-topright::after,
  .border-bottomleft::after {
  transform: scaleX(.33333);
  }
  }