微信小程序自定义select下拉选项框组件的实现代

Component({
 properties: {
  // 这里定义了innerText属性，属性值可以在组件使用时指定
  innerText: {
   type: String,
   value: 'default value',
  }
 },
 data: {
  // 这里是一些组件内部数据
  someData: {}
 },
 methods: {
  // 这里是一个自定义方法
  customMethod: function(){}
 }
})

<view class='-selectBox'>
  <view class='-sContent' bindtap='selectToggle'>
    <view class='-sTxt'>{{nowText}}</view>
    <image src='../../public/img/local/down.png' class='-sImg' animation="{{animationData}}"></image>
  </view>
  <view class='-sList' wx:if="{{selectShow}}">
    <view wx:for="{{propArray}}" data-index="{{index}}" wx:key='' class='-sItem' bindtap='setText'>{{item.text}}</view>
  </view>
</view>

.-selectBox{
  width: 200px;
}
.-sContent{
  border: 1px solid #e2e2e2;
  background: white;
  font-size: 16px;
  position: relative;
  height: 30px;
  line-height: 30px;
}
.-sImg{
  position: absolute;
  right: 10px;
  : 11px;
  width: 16px;
  height: 9px;
  transition: all .3s ease;
}
.-sTxt{
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  padding:0 20px 0 6px;
  font-size: 14px;
}
.-sList{
  background: white;
  width: inherit;
  position: absolute;
  border: 1px solid #e2e2e2;
  border-: none;
  box-sizing: border-box;
  z-index: 3;
  max-height: 120px;
  overflow: auto;
}
.-sItem{
  height: 30px;
  line-height: 30px;
  border-: 1px solid #e2e2e2;
  padding: 0 6px;
  text-align: left;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 14px;
}
.-sItem:first-child{
  border-: none;
}

// Compo/Compo.js
Component({
 /
   组件的属性列表
  /
  properties: {
    propArray:{
      type:Array,
    }
  },
 /
   组件的初始数据
  /
  data: {
    selectShow:false,//初始option不显示
    nowText:"请选择",//初始内容
    animationData:{}//右边箭头的动画
  },
 /
   组件的方法列表
  /
  methods: {
　　　//option的显示与否
    selectToggle:function(){
      var nowShow=this.data.selectShow;//获取当前option显示的状态
      //创建动画
      var animation = wx.createAnimation({
        timingFunction:"ease"
      })
      this.animation=animation;
      if(nowShow){
        animation.rotate(0).step();
        this.setData({
          animationData: animation.export()
        })
      }else{
        animation.rotate(180).step();        
        this.setData({
          animationData: animation.export()
        })
      }
      this.setData({
        selectShow: !nowShow
      })
    },
    //设置内容
    setText:function(e){
      var nowData = this.properties.propArray;//当前option的数据是引入组件的页面传过来的，所以这里获取数据只有通过this.properties
      var nowIdx = e.target.dataset.index;//当前点击的索引
      var nowText = nowData[nowIdx].text;//当前点击的内容
      //执行动画，注意这里一定，一定，一定是this.animation来使用动画
      this.animation.rotate(0).step();
      this.setData({
        selectShow: false,
        nowText:nowText,
        animationData: this.animation.export()
      })
    }
  }
})

"usingComponents": {
  "Select": "/Compo/select/select"
}

<Select prop-array='{{selectArray}}'></Select>

selectArray: [{
  "id": "10",
  "text": "会计类"
}, {
  "id": "21",
  "text": "工程类"
}]

<Select prop-array='{{selectArray}}'></Select>
<Select prop-array='{{selectArray}}'></Select>