<!--index.wxml-->
<view class="container">
  <scroll-view scroll-y="true" style="height: 200px;">
    <view id="green" class="scroll-view-item bc_green"></view>
    <view id="red"  class="scroll-view-item bc_red"></view>
    <view id="yellow" class="scroll-view-item bc_yellow"></view>
    <view id="blue" class="scroll-view-item bc_blue"></view>
  </scroll-view>
</view>

.scroll-view-item{
  height: 200px;
}

.bc_green{
  background-color: green;
}

.bc_red{
  background-color: red;
}

.bc_yellow{
  background-color: yellow;
}
.bc_blue{
  background-color: blue;
}