van-datetime-picker循环 每个item添加时间

<div>
  <div v-for="(item,index) in 3" :key="index">
     <strong><span class="span"></span>宝宝信息{
         
  {index+1}}</strong>
     <van-field
       readonly
       clickable
       name="datetimePicker"
       :value="item.birthday ? formatDate(item.birthday, YY/MM/DD/) : item.birthday"
       label="宝宝生日"
       placeholder="选择宝宝生日"
       @click="item.showBabyBri = true"
     />
     <van-popup v-model="item.showBabyBri" position="bottom">
       <van-datetime-picker
         type="date"
         v-model="item.currentDate"
         title="选择宝宝生日"
         :min-date="minDate"
         @confirm="onBabyConfirmTime(item)"
         @cancel="item.showBabyBri = false"
       />
     </van-popup>
   </div>
 </div>

data() {
          
   
 return {
          
   
   showPicker: false,
   minDate: new Date(2017, 0, 1),
   list: [
     {
          
   
       index: 0,
       birthday: , // 宝宝生日
       showBabyBri: false,
     }
   ]
 }
},
methods: {
          
   
onBabyConfirmTime(item) {
          
   
  item.birthday = this.formatDate(item.currentDate, YY/MM/DD/);
  item.showBabyBri = false;
},
// 格式化时间
formatDate(time,format=YY-MM-DD hh:mm:ss){
          
   
   var date = new Date(time);
   var year = date.getFullYear(),
     month = date.getMonth()+1,//月份是从0开始的
     day = date.getDate(),
     hour = date.getHours(),
     min = date.getMinutes(),
     sec = date.getSeconds();
   var preArr = Array.apply(null,Array(10)).map(function(elem, index) {
          
   
     return 0+index;
   });开个长度为10的数组 格式为 00 01 02 03

   var newTime = format.replace(/YY/g,year)
             .replace(/MM/g,preArr[month]||month)
             .replace(/DD/g,preArr[day]||day)
             .replace(/hh/g,preArr[hour]||hour)
             .replace(/mm/g,preArr[min]||min)
             .replace(/ss/g,preArr[sec]||sec);

   return newTime;
 },
}