版本：1.6.3
- https://cdn.bootcss.com/flatpickr/1.6.3/flatpickr.dark.min.css
- https://cdn.bootcss.com/flatpickr/1.6.3/flatpickr.js
- https://cdn.bootcss.com/flatpickr/1.6.3/flatpickr.min.css
- https://cdn.bootcss.com/flatpickr/1.6.3/flatpickr.min.js
A lightweight, powerful datetimepicker