"usingComponents": {
  "van-dropdown-menu": "@vant/weapp/dropdown-menu/index",
  "van-dropdown-item": "@vant/weapp/dropdown-item/index"
}

<van-dropdown-menu>
  <van-dropdown-item value="{{ value1 }}" options="{{ option1 }}" />
  <van-dropdown-item value="{{ value2 }}" options="{{ option2 }}" />
</van-dropdown-menu>

Page({
  data: {
    option1: [
      { text: '全部商品', value: 0 },
      { text: '新款商品', value: 1 },
      { text: '活动商品', value: 2 },
    ],
    option2: [
      { text: '默认排序', value: 'a' },
      { text: '好评排序', value: 'b' },
      { text: '销量排序', value: 'c' },
    ],
    value1: 0,
    value2: 'a',
  },
});

<van-dropdown-menu>
  <van-dropdown-item value="{{ value1 }}" options="{{ option1 }}" />
  <van-dropdown-item id="item" title="{{ itemTitle }}">
    <van-cell title="{{ switchTitle1 }}">
      <van-switch
        slot="right-icon"
        size="24px"
        style="height: 26px"
        checked="{{ switch1 }}"
        active-color="#ee0a24"
        bind:change="onSwitch1Change"
      />
    </van-cell>
    <van-cell title="{{ switchTitle2 }}">
      <van-switch
        slot="right-icon"
        size="24px"
        style="height: 26px"
        checked="{{ switch2 }}"
        active-color="#ee0a24"
        bind:change="onSwitch2Change"
      />
    </van-cell>
    <view style="padding: 5px 16px;">
      <van-button type="danger" block round bind:click="onConfirm">
        确认
      </van-button>
    </view>
  </van-dropdown-item>
</van-dropdown-menu>

Page({
  data: {
    switchTitle1: '包邮',
    switchTitle2: '团购',
    itemTitle: '筛选',
    option1: [
      { text: '全部商品', value: 0 },
      { text: '新款商品', value: 1 },
      { text: '活动商品', value: 2 },
    ],
    value1: 0,
  },

  onConfirm() {
    this.selectComponent('#item').toggle();
  },

  onSwitch1Change({ detail }) {
    this.setData({ switch1: detail });
  },

  onSwitch2Change({ detail }) {
    this.setData({ switch2: detail });
  },
});

<van-dropdown-menu active-color="#1989fa">
  <van-dropdown-item value="{{ value1 }}" options="{{ option1 }}" />
  <van-dropdown-item value="{{ value2 }}" options="{{ option2 }}" />
</van-dropdown-menu>

<van-dropdown-menu direction="up">
  <van-dropdown-item value="{{ value1 }}" options="{{ option1 }}" />
  <van-dropdown-item value="{{ value2 }}" options="{{ option2 }}" />
</van-dropdown-menu>

<van-dropdown-menu>
  <van-dropdown-item value="{{ value1 }}" disabled options="{{ option1 }}" />
  <van-dropdown-item value="{{ value2 }}" disabled options="{{ option2 }}" />
</van-dropdown-menu>

<van-dropdown-menu>
  <van-dropdown-item value="{{ value1 }}" options="{{ option1 }}" use-before-toggle bind:before-toggle="onBeforeChange" />
</van-dropdown-menu>

Page({
  data: {
    value1: 0,
     option1: [
      { text: '全部商品', value: 0 },
      { text: '新款商品', value: 1 },
      { text: '活动商品', value: 2 },
    ],
  },
  onBeforeChange({ detail: { status, callback }}) {
    wx.showModal({
      title: '异步打开/关闭',
      content: `确定要${status ? '打开' : '关闭'}下拉菜单吗？`,
      success: (res) => {
        if (res.confirm) {
          callback(true)
        } else if (res.cancel) {
          callback(false)
        }
      },
    })
  }
});