移动手机端0.5px线条

添加对应的类名，在pc算线条展示1px，2c端展示0.5px效果

/* 1px hack */
.ui-border-t {
  border-top: 1px solid #e0e0e0; }

.ui-border-b {
  border-bottom: 1px solid #e0e0e0; }

.ui-border-tb {
  border-top: #e0e0e0 1px solid;
  border-bottom: #e0e0e0 1px solid;
  background-image: none; }

.ui-border-l {
  border-left: 1px solid #e0e0e0; }

.ui-border-r {
  border-right: 1px solid #e0e0e0; }

.ui-border {
  border: 1px solid #e0e0e0; }

.ui-border-radius {
  border: 1px solid #e0e0e0;
  border-radius: 4px; }
  @media screen and (-webkit-min-device-pixel-ratio: 2) {
    .ui-border-radius {
      position: relative;
      border: 0; }
      .ui-border-radius:before {
        content: "";
        width: 200%;
        height: 200%;
        position: absolute;
        top: 0;
        left: 0;
        border: 1px solid #e0e0e0;
        -webkit-transform: scale(0.5);
        -webkit-transform-origin: 0 0;
        padding: 1px;
        -webkit-box-sizing: border-box;
        border-radius: 8px;
        pointer-events: none; } }

@media screen and (-webkit-min-device-pixel-ratio: 2) {
  .ui-border {
    position: relative;
    border: 0; }

  .ui-border-t, .ui-border-b, .ui-border-l, .ui-border-r, .ui-border-tb {
    border: 0; }

  .ui-border-t {
    background-position: left top;
    background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)); }

  .ui-border-b {
    background-position: left bottom;
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)); }

  .ui-border-t,
  .ui-border-b,
  .ui-border-tb {
    background-repeat: repeat-x;
    -webkit-background-size: 100% 1px; }

  .ui-border-tb {
    background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)), -webkit-gradient(linear, left top, left bottom, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0));
    background-position: top, bottom; }

  .ui-border-l {
    background-position: left top;
    background-image: -webkit-gradient(linear, right top, left top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)); }

  .ui-border-r {
    background-position: right top;
    background-image: -webkit-gradient(linear, left top, right top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)); }

  .ui-border-l,
  .ui-border-r {
    background-repeat: repeat-y;
    -webkit-background-size: 1px 100%; }

  .ui-border:after {
    content: "";
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    background-image: -webkit-gradient(linear, left bottom, left top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)), -webkit-gradient(linear, left top, right top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)), -webkit-gradient(linear, left top, left bottom, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0)), -webkit-gradient(linear, right top, left top, color-stop(0.5, transparent), color-stop(0.5, #e0e0e0), to(#e0e0e0));
    -webkit-background-size: 100% 1px,1px 100% ,100% 1px, 1px 100%;
    background-size: 100% 1px,1px 100% ,100% 1px, 1px 100%;
    -webkit-background-size: 100% 1px,1px 100% ,100% 1px, 1px 100%;
            background-size: 100% 1px,1px 100% ,100% 1px, 1px 100%;
    background-repeat: no-repeat;
    background-position: top, right, bottom, left;
    padding: 1px;
    -webkit-box-sizing: border-box;
    z-index: 10;
    pointer-events: none; } }