<view class="row-wrap">
     <view class="label">预约项目</view>
     <picker bindchange="bindCasPickerChange" value="{{casIndex1}}" range="{{casArray}}">
      <view>
       <text>{{casArray[casIndex]}}</text>
      </view>

     </picker>
    </view>

   </view>
<view class="section {{reply?'on':'off'}}">
    <input name="other" placeholder="请输入所预约项目" type="text"/>
  </view>

data: {
  nickName: "",
  avatarUrl: "",
  casArray: ['双眼皮', 'TBM', '隆胸', '减肥', '手动输入'],
  userName: '',
  mobile: '',
  Gender: 'female',
  casIndex: 0,
 },

 /**
 * 生命周期函数--监听页面加载
  */

 bindCasPickerChange: function (e) {
  console.log('乔丹选的是', this.data.casArray[e.detail.value])
  if (e.detail.value == 4) {
   this.setData({ reply: true })
  } else {
   this.setData({ reply: false })
  }
  this.setData({
   casIndex: e.detail.value
  })

 },

.section{
   font-size:28rpx;
   margin-left: 50rpx;
   margin-top: 30rpx;
  }
  .on{display: block}
  .off{display: none}