微信小程序中picker的使用

picker是分为普通picker， 日期选择， 省市区

<view class="fliter">
  
 <view class="filter_item">
    <picker bindchange="bindPickerChange"
      value="{{setIndex}}"
      range="{{activityArr}}"
      range-key="label">
        <view class="picker">
          {{activityArr[setIndex].label}}
          <image src='../../assets/arrow.png' />
        view>
  picker>
 view>

js中的写法

    activityArr: [
      { id: 1, label: '展会活动' },
      { id: 2, label: '促销活动' },
      { id: 3, label: '节日活动' },
      { id: 4, label: '答谢活动' }
    ],
    bindPickerChange (e) {
      console.log("e",e);
      this.setData({
        setIndex: parseInt(e.detail.value)
      })
    },