移动端1px线适配问题-------适配各种编译CSS工具 stylus sass styled-componet实现方法

其实在stylus与sass中实现移动端1像素线各个手机设备的适配问题的原理是一样的，

首先我还是先介绍一下原理和所依赖的方法

原理：其实他们都是通过css3的媒体查询来实现的

步骤思路：

1、给目标元素进行相对定位

2、给目标元素添加伪元素 ::after/before 并进行绝对定位

3、判断DPI 1DPI 100% --------------使用媒体查询

2DPI 200%

3DPI 300%

4、通过css3中的transform scale等比缩放

下面是具体的代码，使用时只需引入代码 在style里直接写 border： 1px 0 0 0， #ccc 即可使用

在stylus中

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;

在sass中

@mixin border($border-width: 1px, $border-color: map-get($base, border-color), $border-style: solid, $radius: null) {
    // 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
        @include responsive(retina1x) {
            width: 100%;
            height: 100%;
            @if $radius != null {
                border-radius: $radius;
            }
        }
        @include responsive(retina2x) {
            width: 200%;
            height: 200%;
            @include transform(scale(.5));
            @if $radius != null {
                border-radius: $radius * 2;
            }
        }
        @include responsive(retina3x) {
            width: 300%;
            height: 300%;
            @include transform(scale(.33333));
            @if $radius != null {
                border-radius: $radius * 3;
            }
        }
        @include transform-origin(0 0);
    }
}

在component中

import styled from 'styled-components'

const border = ({
    component = null,
    width = '1px',
    style = 'solid',
    color = '#ccc',
    radius = 0,
}) => {
    return styled(component) `
    position: relative;
    border-width: ${ width};
    border-radius: ${ radius + 'px'};
    &::after {
      pointer-events: none;
      position: absolute;
      z-index: 999;
      top: 0;
      left: 0;
      content: "";
      border-color: ${ color};
      border-style: ${ style};
      border-width: ${ width};

      @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%;
          border-radius: ${ radius + 'px'};
        };
      
      @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);
          border-radius: ${ radius * 2 + 'px'};
        };
      
      @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);
          border-radius: ${ radius * 3 + 'px'}
        };

        transform-origin: 0 0;
    };
  `
}

export default border

亲自使用过超级好使

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