效果

wxml

<view class="layout">
    <view class="left">
    <view>1</view>
    <view>1</view>
    <view>1</view>
    <view>1</view>
    <view>1</view>
    </view>
    <view class="right">
      <view class="right-item1">2</view>
      <view class="right-item2">3</view>
    </view>
</view>

wxss

.layout {
  width: 100%;
  display: flex;

}
.left {
  width: 50%;
  background-color: #6ba2e0;
}

.right {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.right-item1 {
  flex: 1;
  background-color: #8bc34a;
}

.right-item2 {
  flex: 1;
  background-color: #ce8adf;
}