版本：1.5.1
- https://cdn.bootcss.com/flatpickr/1.5.1/flatpickr.css
- https://cdn.bootcss.com/flatpickr/1.5.1/flatpickr.js
- https://cdn.bootcss.com/flatpickr/1.5.1/flatpickr.min.css
- https://cdn.bootcss.com/flatpickr/1.5.1/flatpickr.min.js
A lightweight, powerful datetimepicker