微信小程序无法使用阿里的开源icon https://developers.weixin.qq.com/blogedit?action=edit_blog&lang=zh_CN&token=1704698442

picker-view设置了value，实际不生效。。。请问如何处理？ [图片] JS     //生成年月日时分秒     let date = new Date()     let years = []     let months = []     let days = []     let hours = []     let minutes = []     let seconds = []     for (let i = 1990; i <= date.getFullYear(); i++) {       years.push(i)     }     for (let i = 1; i <= 12; i++) {       months.push(i)     }     for (let i = 1; i <= 31; i++) {       days.push(i)     }     for (let i = 0; i <= 23; i++) {       hours.push(i)     }     for (let i = 0; i <= 59; i++) {       minutes.push(i)       seconds.push(i)     }     _this.setData({       years: years,       months: months,       days: days,       hours: hours,       minutes: minutes,       seconds: seconds,       followupdatetimeValue: [9999, 9, 2, 1, 21, 11],     }) WXML     <picker-view indicator-style="height: 50px;" style="width: 100%; height: 50vh;" value="{{followupdatetimeValue}}"       bindchange="followupdatetimeChange">       <picker-view-column>         <view wx:for="{{years}}" wx:for-item="item" style="line-height: 50px; text-align: center;">{{item}}年         </view>       </picker-view-column>       <picker-view-column>         <view wx:for="{{months}}" wx:for-item="item" wx:for-index="idx" style="line-height: 50px; text-align: center;">{{item}}月         </view>       </picker-view-column>       <picker-view-column>         <view wx:for="{{days}}" wx:for-item="item"  style="line-height: 50px; text-align: center;">{{item}}日</view>       </picker-view-column>       <picker-view-column>         <view wx:for="{{hours}}" wx:for-item="item"  style="line-height: 50px; text-align: center;">{{item}}时         </view>       </picker-view-column>       <picker-view-column>         <view wx:for="{{minutes}}" wx:for-item="item"  style="line-height: 50px; text-align: center;">{{item}}分         </view>       </picker-view-column>       <picker-view-column>         <view wx:for="{{seconds}}" wx:for-item="item"  style="line-height: 50px; text-align: center;">{{item}}秒         </view>       </picker-view-column>     </picker-view>

在小程序的组件中定义如下： [代码]<[代码][代码]view[代码][代码]>[代码][代码]<[代码][代码]slot[代码] [代码]name[代码][代码]=[代码][代码]"a"[代码][代码]></[代码][代码]slot[代码][代码]>[代码][代码]<[代码][代码]slot[代码] [代码]name[代码][代码]=[代码][代码]"b"[代码][代码]></[代码][代码]slot[代码][代码]>[代码][代码]</[代码][代码]view[代码][代码]>[代码] 使用时 [代码]<[代码][代码]component-test[代码][代码]>[代码][代码]<[代码][代码]view[代码] [代码]slot[代码][代码]=[代码][代码]"b"[代码][代码]>test</[代码][代码]view[代码][代码]>[代码][代码]</[代码][代码]component-test[代码][代码]>[代码]该怎么判断slot a是否存在呢？（不存在的元素做隐藏）

比如：picker 右上角确定按钮的样式怎么修改？ [图片]