移动端一像素边框

这里使用的是 scss 的 mixin。

/* 1像素边框 */

@mixin border($width: 1px, $border-color: $color-border, $border-radius: initial) {
    position: relative;

    /* 默认 */
    &:after {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        border: $width solid $border-color;
        border-radius: $border-radius;
        box-sizing: border-box;
        width: 100%;
        height: 100%;
    }

    /* 设备像素比为 2 */
    @media only screen and (-webkit-min-device-pixel-ratio: 2),
    only screen and (min-device-pixel-ratio: 2) {
        &:after {
            width: 200%;
            height: 200%;
            transform: scale(0.5);
            transform-origin: left top;
        }
    }

    /* 设备像素比为 3 */
    @media only screen and (-webkit-min-device-pixel-ratio: 3),
    only screen and (min-device-pixel-ratio: 3) {
        &:after {
            width: 300%;
            height: 300%;
            transform: scale(0.333333);
            transform-origin: left top;
        }
    }
}

@mixin border-bottom($height: 1px, $width: 100%, $border-color: $color-border) {
    position: relative;

    /* 默认 */
    &:after {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        bottom: 0;
        width: $width;
        height: $height;
        background-color: $border-color;
    }

    /* 设备像素比为 2 */
    @media only screen and (-webkit-min-device-pixel-ratio: 2),
    only screen and (min-device-pixel-ratio: 2) {
        &:after {
            background-color: $border-color;
            transform: scaleY(0.5);
        }
    }

    /* 设备像素比为 3 */
    @media only screen and (-webkit-min-device-pixel-ratio: 3),
    only screen and (min-device-pixel-ratio: 3) {
        &:after {
            background-color: $border-color;
            transform: scaleY(0.333333);
        }
    }
}

@mixin border-top($height: 1px, $width: 100%, $border-color: $color-border) {
    position: relative;

    /* 默认 */
    &:after {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        top: 0;
        width: $width;
        height: $height;
        background-color: $border-color;
    }

    /* 设备像素比为 2 */
    @media only screen and (-webkit-min-device-pixel-ratio: 2),
    only screen and (min-device-pixel-ratio: 2) {
        &:after {
            transform: scaleY(0.5);
        }
    }

    /* 设备像素比为 3 */
    @media only screen and (-webkit-min-device-pixel-ratio: 3),
    only screen and (min-device-pixel-ratio: 3) {
        &:after {
            transform: scaleY(0.333333);
        }
    }
}

@mixin border-right($height: 100%, $width: 1px, $border-color: $color-border) {
    position: relative;

    /* 默认 */
    &:after {
        content: "";
        position: absolute;
        right: 0;
        top: 0;
        bottom: 0;
        width: $width;
        height: $height;
        background-color: $border-color;
    }

    /* 设备像素比为 2 */
    @media only screen and (-webkit-min-device-pixel-ratio: 2),
    only screen and (min-device-pixel-ratio: 2) {
        &:after {
            transform: scaleX(0.5);
        }
    }

    /* 设备像素比为 3 */
    @media only screen and (-webkit-min-device-pixel-ratio: 3),
    only screen and (min-device-pixel-ratio: 3) {
        &:after {
            transform: scaleX(0.333333);
        }
    }
}

@mixin border-left($height: 100%, $width: 1px, $border-color: $color-border) {
    position: relative;

    /* 默认 */
    &:after {
        content: "";
        position: absolute;
        left: 0;
        top: 0;
        bottom: 0;
        width: $width;
        height: $height;
        background-color: $border-color;
    }

    /* 设备像素比为 2 */
    @media only screen and (-webkit-min-device-pixel-ratio: 2),
    only screen and (min-device-pixel-ratio: 2) {
        &:after {
            transform: scaleX(0.5);
        }
    }

    /* 设备像素比为 3 */
    @media only screen and (-webkit-min-device-pixel-ratio: 3),
    only screen and (min-device-pixel-ratio: 3) {
        &:after {
            transform: scaleX(0.333333);
        }
    }
}

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# 移动端一像素边框

移动端一像素边框