现在很多笔记本电脑都推荐将缩放设置为125%,等比例放大显示。(垃圾Windows
3163780373-5bd7b24150eec_articlex.png

这对我们前端的页面的布局会产生一些影响

  1. 首先,单独的响应式布局hold不住这个问题,因为出问题的是device-pixel-ratio
  2. 问题现象是高分屏下整好的东西,在普分屏下会放大;而普分屏下整好的东西,在高分屏上会缩小。
  3. 重现这个问题不需要高分屏,直接用Ctrl++或者Ctrl+-出来的效果是跟高分屏一致的(所以搞定这个问题之后,也可以同时预防用户误触网页缩放)。另外恢复是Ctrl+Num0
  4. 解决的关键就是你得在媒体适配里写device-pixel-ratio单独适配像素比;另外,需要把绝大多数组件由px单位转换为rem单位,因为需要在前边提到的device-pixel-ratio里调节:rootfont-size`,以达到动态缩放的目的

(加上兼容)写好以后的代码类似:

@media all
and (-moz-min-device-pixel-ratio: 1.09) and (-moz-max-device-pixel-ratio: 1.18),
    (-webkit-min-device-pixel-ratio: 1.09) and (-webkit-max-device-pixel-ratio: 1.18),
    (min-resolution: 1.09dppx) and (max-resolution: 1.18dppx) {
    :root {
        font-size: 14px;
    }
}
@media all
and (-moz-min-device-pixel-ratio: 1.19) and (-moz-max-device-pixel-ratio: 1.28),
    (-webkit-min-device-pixel-ratio: 1.19) and (-webkit-max-device-pixel-ratio: 1.28),
    (min-resolution: 1.19dppx) and (max-resolution: 1.28dppx) {
    :root {
        font-size: 13px;
    }
}
@media all
and (-moz-min-device-pixel-ratio: 1.29) and (-moz-max-device-pixel-ratio: 1.4),
    (-webkit-min-device-pixel-ratio: 1.29) and (-webkit-max-device-pixel-ratio: 1.4),
    (min-resolution: 1.29dppx) and (max-resolution: 1.4dppx) {
    :root {
        font-size: 12px;
    }
}
@media all
and (-moz-min-device-pixel-ratio: 1.41) and (-moz-max-device-pixel-ratio: 1.6),
    (-webkit-min-device-pixel-ratio: 1.41) and (-webkit-max-device-pixel-ratio: 1.6),
    (min-resolution: 1.41dppx) and (max-resolution: 1.6dppx) {
    :root {
        font-size: 10px;
    }
}
@media all
and (-moz-min-device-pixel-ratio: 1.61) and (-moz-max-device-pixel-ratio: 1.8),
    (-webkit-min-device-pixel-ratio: 1.61) and (-webkit-max-device-pixel-ratio: 1.8),
    (min-resolution: 1.61dppx) and (max-resolution: 1.8dppx) {
    :root {
        font-size: 9px;
    }
}
@media all
and (-moz-min-device-pixel-ratio: 1.81) and (-moz-max-device-pixel-ratio: 2.1),
    (-webkit-min-device-pixel-ratio: 1.81) and (-webkit-max-device-pixel-ratio: 2.1),
    (min-resolution: 1.81dppx) and (max-resolution: 2.1dppx) {
    :root {
        font-size: 8px;
    }
}