微信小程序select下拉框实现效果

<view class='list-msg'>
 <view class='list-msg1'>
 <text>商品金额</text>
 <text>￥99.00</text>
 </view>
<!--下拉框 -->
 <view class='list-msg2' bindtap='bindShowMsg'>
 <text>{{tihuoWay}}</text>
 <image style='height:20rpx;width:20rpx;' src='/images/down.png'></image>
 </view>
 <view class='list-msg1'>
 <text>运费</text>
 <text></text>免邮</view>
 <view class='list-msg1'>
 <text>实际付款</text>
 <text style='color:red'>￥99.00</text>
 </view>
<!-- 下拉需要显示的列表 -->
 <view class="select_box" wx:if="{{select}}">
 <view class="select_one" bindtap="mySelect" data-name="重庆分店">重庆分店</view>
 <view class="select_one" bindtap="mySelect" data-name="东莞南城分店">东莞南城分店</view>
 <view class="select_one" bindtap="mySelect" data-name="东莞总店">东莞总店</view>
 </view>
</view>

Page({
 
 /**
 * 页面的初始数据
 */
 data: {
 select: false,
 tihuoWay: '门店自提'
 },
 
 /**
 * 生命周期函数--监听页面加载
 */
 onLoad: function (options) {
 
 },
 bindShowMsg() {
 this.setData({
 select:!this.data.select
 })
 },
 mySelect(e) {
 var name = e.currentTarget.dataset.name
 this.setData({
 tihuoWay: name,
 select: false
 })
 },
 
 
 /**
 * 用户点击右上角分享
 */
 onShareAppMessage: function () {
 
 }
})

.list-msg {
 padding: 0 20rpx;
 background-color: #fff;
 position: relative;
}
 
.list-msg1 {
 height: 60rpx;
 display: flex;
 align-items: center;
 justify-content: space-between;
}
 
.list-msg .list-msg2 {
 height: 60rpx;
 display: flex;
 align-items: center;
 justify-content: space-between;
 border: 1px solid #ccc;
 padding: 0 10rpx;
}
 
.select_box {
 background-color: #eee;
 padding: 0 10rpx;
 width: 93%;
 position: absolute;
 top: 130rpx;
 z-index: 1;
 overflow: hidden;
 animation: myfirst 0.5s;
}
 
@keyframes myfirst {
 from {
 height: 0rpx;
 }
 
 to {
 height: 210rpx;
 }
}
 
.select_one {
 height: 60rpx;
 line-height: 60rpx;
 border-bottom: 1px solid #ccc;
}