版本：1.5.2
- https://cdn.bootcss.com/flatpickr/1.5.2/flatpickr.css
- https://cdn.bootcss.com/flatpickr/1.5.2/flatpickr.js
- https://cdn.bootcss.com/flatpickr/1.5.2/flatpickr.min.css
- https://cdn.bootcss.com/flatpickr/1.5.2/flatpickr.min.js
A lightweight, powerful datetimepicker