手机端背景图片在安卓不显示ios就可以显示，这是为什么呢
html
<p class="car-class border-b-d">

        <p class="car-class-title">选择车型</p>
        <p class="car-class-check car-class-mvp-off">
            <p>中大型</p>
            <p>SUVMVP</p>
        </p>
        <p class="car-class-check car-class-suv-on">
            <p>普通车型</p>
            <p>小型SUV</p>
        </p>

    </p>

css

.car-class{
  padding:20*@n 30*@n;
  .car-class-title{
    .d-ib();
    .c(3);
    .l-h(156*@n);
    .font-s(24*@n);
    vertical-align: middle;
  }
  .car-class-check{
    .d-ib();
    .fr();
    .text-c();
    .font-s(22*@n);
    padding-top:80*@n;
    width:35%;
    height:156*@n;
    vertical-align: middle;
    border:1px solid #ff6c26;
    -webkit-border-radius:10*@n;
    -moz-border-radius:10*@n;
    border-radius:10*@n;
    margin-left:20*@n;

  }
  .car-class-suv-on{
    background:url(../images/car-class-s-on.png)no-repeat center top 20*@n;
    background-size:143*@n 55*@n;
  }
  .car-class-suv-off{
    background:url(../images/car-class-s-off.png)no-repeat center top 20*@n;
    background-size: 143*@n 55*@n;
  }
  .car-class-mvp-on{
    background:url(../images/car-on.png)no-repeat center top 20*@n;
    background-size:143*@n 55*@n;
  }
  .car-class-mvp-off{
    background:url(../images/car-off.png)no-repeat center top 20*@n;
    background-size: 143*@n 55*@n;
  }
}