Vant4没有DatetimePicker，只有DatePicker，所以按需引入组件需要改为引入DatePicker

[bomblet2]

// generated by unplugin-vue-components
// We suggest you to commit this file into source control
// Read more: vuejs/core#3399
import '@vue/runtime-core'

export {}

declare module '@vue/runtime-core' {
export interface GlobalComponents {
NavBar: typeof import('./../components/NavBar/index.vue')['default']
RouterLink: typeof import('vue-router')['RouterLink']
RouterView: typeof import('vue-router')['RouterView']
SvgIcon: typeof import('./../components/SvgIcon/index.vue')['default']
Tabbar: typeof import('./../components/Tabbar/index.vue')['default']
VanButton: typeof import('vant/es')['Button']
VanCell: typeof import('vant/es')['Cell']
VanConfigProvider: typeof import('vant/es')['ConfigProvider']
VanDatePicker: typeof import('vant/es')['DatePicker']

VanDatetimePicker: typeof import('vant/es')['DatetimePicker']  //改为 引入 DatePicker

VanNavBar: typeof import('vant/es')['NavBar']
VanSpace: typeof import('vant/es')['Space']
VanTabbar: typeof import('vant/es')['Tabbar']
VanTabbarItem: typeof import('vant/es')['TabbarItem']

}
}