Datejs 介绍
Date.js 是一个开源的JavaScript库，用来解析、格式化和处理日期数据，支持多种语言的日期格式处理。
示例代码：
Date.today() // Returns today’s date, with time set to 00:00 (start of day).
Date.today().next().friday() // Returns the date of the next Friday.
Date.today().last().monday() // Returns the date of the prevIoUs Monday.
new Date().next().march() // Returns the date of the next march.
new Date().last().week() // Returns the date one week ago.
Date.today().is().friday() // Returns true|false if the day-of-week matches.
Date.today().is().fri() // Abbreviated day names.
Date.today().is().november() // Month names.
Date.today().is().nov() // Abbreviated month names.