.borderOnePx{
position: relative;
}
.borderOnePx::after {
content: '';
height:1px;
background:#000;
-webkit-transform: scaleY(0.5);
-webkit-transform-origin:0 0;
overflow: hidden;
}
/* 2倍屏 */
@media only screen and (-webkit-min-device-pixel-ratio: 2.0) {
.borderOnePx::after {
-webkit-transform: scaleY(0.5);
transform: scaleY(0.5);
}
}

/* 3倍屏 */
@media only screen and (-webkit-min-device-pixel-ratio: 3.0) {
.borderOnePx::after {
-webkit-transform: scaleY(0.33);
transform: scaleY(0.33);
}
}