api里只说明了纵向滑动的关键:设置scroll-view的高度，代码如下：

wxml

<scroll-view scroll-y class='ver'>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
</scroll-view>

wxss

.ver {
  height: 300rpx;
}

但如果需要横向滑动，如法炮制就不行了。
关键需要将子元素横向排列：

wxml

<scroll-view scroll-x>
  <view class='hor'>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
    <view>11111</view>
  </view>
</scroll-view>

如果是循环，还需要包裹一层block或者view:

<scroll-view scroll-x>
  <view class='hor'>
    <block wx:for='{{items}}'>
      <view>{{item.title}}</view>
    </block>
  </view>
</scroll-view>

wxss

.hor {
  display: flex;
  flex-direction: row;
  width: 600rpx;
}

完