版本：
文件：
- https://cdn.bootcdn.net/ajax/libs/jquery.AreYouSure/1.9.0/jquery.are-you-sure.js
- https://cdn.bootcdn.net/ajax/libs/jquery.AreYouSure/1.9.0/jquery.are-you-sure.min.js
A light-weight jQuery "dirty forms" Plugin - it monitors HTML forms and alerts users to unsaved changes if they attempt to close the browser or navigate away from the page. (Are you sure?)