webpack中使用了url-loader还有必要根据设备像素比载入二倍图和三倍图吗？现在是载入二倍图和三倍图，url-loader转化的data是二倍图还是三倍图？

.logo-horizontal {
  background-image: url("../images/logo-horizontal@2x.png");
}
@media only screen and (-webkit-min-device-pixel-ratio: 3),
  only screen and (-moz-min-device-pixel-ratio: 3),
  only screen and (-o-min-device-pixel-ratio: 3),
  only screen and (min-device-pixel-ratio: 3) {
  .logo-horizontal {
    background-image: url("../images/logo-horizontal@3x.png");
  }
}