官方api：https://mp.weixin.qq.com/debug/wxadoc/dev/component/picker.html

//index.js
//获取应用实例
const app = getApp()
Page({
  data: {
    //设置初始值
    array: [\'中国\', \'美国\', \'巴西\', \'俄罗斯\'],
    objectArray: [
      {
        id: 0,
        name: \'中国\'
      },
      {
        id: 1,
        name: \'美国\'
      },
      {
        id: 2,
        name: \'巴西\'
      },
      {
        id: 3,
        name: \'俄罗斯\'
      }
    ],
    index: 0,
    multiArray: [[\'无脊柱动物\', \'脊柱动物\'], [\'扁性动物\', \'线形动物\', \'环节动物\', \'软体动物\', \'节肢动物\'], [\'寄生虫\', \'吸血虫\']],
    objectMultiArray: [
      [
        {
          id: 0,
          name: \'无脊柱动物\'
        },
        {
          id: 1,
          name: \'脊柱动物\'
        }
      ], [
        {
          id: 0,
          name: \'扁性动物\'
        },
        {
          id: 1,
          name: \'线形动物\'
        },
        {
          id: 2,
          name: \'环节动物\'
        },
        {
          id: 3,
          name: \'软体动物\'
        },
        {
          id: 3,
          name: \'节肢动物\'
        }
      ], [
        {
          id: 0,
          name: \'猪肉绦虫\'
        },
        {
          id: 1,
          name: \'吸血虫\'
        }
      ]
    ],
    multiIndex: [0, 0, 0],
    date: \'2016-09-01\',
    time: \'12:01\',
    region: [\'辽宁省\', \'大连市\', \'高新园区\'],
    customItem: \'全部\'
  },
  //普通选择器的点击事件
  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
    })
  },
  //多列选择器
  bindMultiPickerChange: function (e) {
    console.log(\'picker发送选择改变，携带值为\', e.detail.value)
    this.setData({
      multiIndex: e.detail.value
    })
  },
  //多列选择器，某一列的值改变时触发事件
  bindMultiPickerColumnChange: function (e) {
    console.log(\'修改的列为\', e.detail.column, \'，值为\', e.detail.value);
    var data = {
      multiArray: this.data.multiArray,
      multiIndex: this.data.multiIndex
    };
    data.multiIndex[e.detail.column] = e.detail.value;
    switch (e.detail.column) {
      case 0:
        switch (data.multiIndex[0]) {
          case 0:
            data.multiArray[1] = [\'扁性动物\', \'线形动物\', \'环节动物\', \'软体动物\', \'节肢动物\'];
            data.multiArray[2] = [\'寄生虫\', \'吸血虫\'];
            break;
          case 1:
            data.multiArray[1] = [\'鱼\', \'两栖动物\', \'爬行动物\'];
            data.multiArray[2] = [\'鲫鱼\', \'带鱼\'];
            break;
        }
        data.multiIndex[1] = 0;
        data.multiIndex[2] = 0;
        break;
      case 1:
        switch (data.multiIndex[0]) {
          case 0:
            switch (data.multiIndex[1]) {
              case 0:
                data.multiArray[2] = [\'猪肉绦虫\', \'吸血虫\'];
                break;
              case 1:
                data.multiArray[2] = [\'蛔虫\'];
                break;
              case 2:
                data.multiArray[2] = [\'蚂蚁\', \'蚂蟥\'];
                break;
              case 3:
                data.multiArray[2] = [\'河蚌\', \'蜗牛\', \'蛞蝓\'];
                break;
              case 4:
                data.multiArray[2] = [\'昆虫\', \'甲壳动物\', \'蛛形动物\', \'多足动物\'];
                break;
            }
            break;
          case 1:
            switch (data.multiIndex[1]) {
              case 0:
                data.multiArray[2] = [\'鲫鱼\', \'带鱼\'];
                break;
              case 1:
                data.multiArray[2] = [\'青蛙\', \'娃娃鱼\'];
                break;
              case 2:
                data.multiArray[2] = [\'蜥蜴\', \'龟\', \'壁虎\'];
                break;
            }
            break;
        }
        data.multiIndex[2] = 0;
        console.log(data.multiIndex);
        break;
    }
    this.setData(data);
  },
  //日期选择器
  bindDateChange: function (e) {
    console.log(\'picker发送选择改变，携带值为\', e.detail.value)
    this.setData({
      date: e.detail.value
    })
  },
  //时间选择器
  bindTimeChange: function (e) {
    console.log(\'picker发送选择改变，携带值为\', e.detail.value)
    this.setData({
      time: e.detail.value
    })
  },
  //省市区选择器
  bindRegionChange: function (e) {
    console.log(\'picker发送选择改变，携带值为\', e.detail.value)
    this.setData({
      region: e.detail.value
    })
  }
})

<view class="section">
  <view class="section__title">普通选择器：</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">多列选择器：</view>
  <picker mode="multiSelector" bindchange="bindMultiPickerChange" bindcolumnchange="bindMultiPickerColumnChange" value="{{multiIndex}}" range="{{multiArray}}">
    <view class="picker">
      当前选择：{{multiArray[0][multiIndex[0]]}}，{{multiArray[1][multiIndex[1]]}}，{{multiArray[2][multiIndex[2]]}}
    </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 class="section">
  <view class="section__title">省市区选择器：</view>
  <picker mode="region" bindchange="bindRegionChange" value="{{region}}" custom-item="{{customItem}}">
    <view class="picker">
      当前选择：{{region[0]}}，{{region[1]}}，{{region[2]}}
    </view>
  </picker>
</view>

.section__title {
  margin: 20rpx;
}

.section {
  width: 100%;
  font-size: 35rpx;
  margin: 10rpx;
  color: #000;
}

.picker {
  color: #6BD44E;
}