<scroll-view class="box" scroll-x="true" >
    <view class="box-item" >1</view>
    <view class="box-item" >2</view>
    <view class="box-item" >3</view>
</scroll-view>

.box {
    width:100%;
    hight: 200rpx;
    /*white-space 不能丢  */
    white-space: nowrap;
    border: 1px solid red;
    box-sizing: border-box
}
.box-item {
    width: 45%;
    hight:100%;
    border:2rpx solid green;
    box-sizing: border-box;
    display: inline-block
}