Checkboxify 介绍
Checkboxify allows you to dynamically replace <select> form elements with
checkbox <input> elements. As the original <select> is hidden and
disabled, rather than removed, dynamic modification of its <option> can be
reflected in the <input> checkboxes.
The current version assumes that any <select> it is applied to allows for
multiple selections. Future versions will check each <select> and generate
checkbox or radio <input>s as appropriate.