微信小程序开发：picker滚动选择器详细介绍

<view class="page">
  <view class="page__hd">
    <text class="page__title">picker</text>
    <text class="page__desc">选择器</text>
  </view>
  <view class="page__bd">
    <view class="section">
      <view class="section__title">地区选择器</view>
      <picker bindchange="bindPickerChange" value="{{index}}" range="{{array}}">
        <view class="picker">
          当前选择：{{array[index]}}
        </view>
      </picker>
    </view>
    <view class="section">
      <view class="section__title">时间选择器</view>
      <picker mode="time" value="{{time}}" start="09:01" end="21:01" bindchange="bindTimeChange">
        <view class="picker">
          当前选择: {{time}}
        </view>
      </picker>
    </view>
    <view class="section">
      <view class="section__title">日期选择器</view>
      <picker mode="date" value="{{date}}" start="2015-09-01" end="2017-09-01" bindchange="bindDateChange">
        <view class="picker">
          当前选择: {{date}}
        </view>
      </picker>
    </view>
  </view>
</view>

Page({
  data: {
    array: ['中国', '美国', '巴西', '日本'],
    index: 0,
    date: '2016-09-01',
    time: '12:01'
  },
  bindPickerChange: function(e) {
    console.log('picker发送选择改变，携带值为', e.detail.value)
    this.setData({
      index: e.detail.value
    })
  },
  bindDateChange: function(e) {
    this.setData({
      date: e.detail.value
    })
  },
  bindTimeChange: function(e) {
    this.setData({
      time: e.detail.value
    })
  }
})

.page {
    min-height: 100%;
    flex: 1;
    background-color: #FBF9FE;
    font-size: 32rpx;
    font-family: -apple-system-font,Helvetica Neue,Helvetica,sans-serif;
    overflow: hidden;
}
.page__hd{
    padding: 50rpx 50rpx 100rpx 50rpx;
    text-align: center;
}
.page__title{
    display: inline-block;
    padding: 20rpx 40rpx;
    font-size: 32rpx;
    color: #AAAAAA;
    border-bottom: 1px solid #CCCCCC;
}
.page__desc{
    display: none;
    margin-top: 20rpx;
    font-size: 26rpx;
    color: #BBBBBB;
}
.picker{
  padding: 26rpx;
  background-color: #FFFFFF;
}
.section{
    margin-bottom: 80rpx;
}
.section__title{
    margin-bottom: 16rpx;
    padding-left: 30rpx;
    padding-right: 30rpx;
}