vant 时间选择器默认值

在van-datetime-picker中，可以使用:value或者v-model绑定默认值。注意，为了展示默认值，必须将默认值设置为new Date()，例如Fri Aug 26 2022 10:14:42 GMT 0800 (中国标准时间)。如果不设置默认值，点击下拉时不会显示默认值。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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