/**app.wxss**/
.one-px-border::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 1px;
  content: '';
  background-color: #f0f0f0;
}
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
  .one-px-border ::after {
    transform: scaleY(0.5);
  }
}
@media (-webkit-min-device-pixel-ratio: 3), (min-resolution: 3dppx) {
  .one-px-border ::after {
    transform: scaleY(0.333);
  }
}