适配移动端1像素边框

a.直接切图解决

b.实现适配移动端1px边框，主要是根据设备的dpr来对边框进行缩放处理，CSS写法如下：

.border-1px{ position: relative;}.border-1px::after{ display: block; position: absolute; left: 0; bottom: 0; width: 100%; border-bottom: 1px solid rgb(217,217,217); content: " ";}@media (-webkit-min-device-pixel-ratio: 1.5), (min-device-pixel-ratio: 1.5) { .border-1px::after { -webkit-transform: scaleY(0.7); transform: scaleY(0.7); }}@media (-webkit-min-device-pixel-ratio: 2), (min-device-pixel-ratio: 2) { .border-1px::after { -webkit-transform: scaleY(0.5); transform: scaleY(0.5); }}