官方网站定义： http://codemirror.net/

• CodeMirror is a versatile text editor implemented in JavaScript for the browser. It is specialized for editing code, and comes with a number of language modes and addons that implement more advanced editing functionality.
• A rich programming API and a CSS theming system are available for customizing CodeMirror to fit your application, and extending it with new functionality.

• User manual and reference guide

1. CodeMirror is a code-editor component that can be embedded in Web pages. The core library provides only the editor component, no accompanying buttons, auto-completion, or other IDE functionality. It does provide a rich API on top of which such functionality can be straightforwardly implemented. See the addons included in the distribution, and thelist of externally hosted addons, for reusable implementations of extra features.
2. CodeMirror works with language-specific modes. Modes are JavaScript programs that help color (and optionally indent) text written in a given language. The distribution comes with a number of modes (see the mode/ directory), and it isn‘t hard to write new ones for other languages.

 1 Features 2  3 Support for over 60 languages out of the box 4 A powerful, composable language mode system 5 Autocompletion (XML) 6 Code folding 7 Configurable keybindings 8 Vim, Emacs, and Sublime Text bindings 9 Search and replace interface10 Bracket and tag matching11 Support for split views12 Linter integration13 Mixing font sizes and styles14 Various themes15 Able to resize to fit content16 Inline and block widgets17 Programmable gutters18 Making ranges of text styled, read-only, or atomic19 Bi-directional text support20 Many other methods and addons...

　　codemirror是一个基于Javascript的代码编辑器，我们可以将其嵌入到任何支持Javascript的页面中。

　　codemirror支持大量语言的高亮显示，包括C、C++、C#、JAVA、Perl、PHP、JavaScript、Python、Lua、Go、Groovy、Ruby等，以及diff、LaTeX、SQL、wiki、Markdown等文件格式。此外，codemirror还支持代码自动完成、搜索/替换、HTML预览、行号、选择/搜索结果高亮、可视化tab、Emacs/VIM键绑定、代码自动格式等。

　　codemirror采用MIT开发许可协议，目前已经被集成到各种应用程序中，如Adobe Bracket、CoDev、Light Table等开发环境，还被作为各种SQL、Haxe、JavaScript在线编辑器的基础库来使用。

　　codemirror是一款"Online Source Editor"，基于Javascript，短小精悍，实时在线代码高亮显示，他不是某个富文本编辑器的附属产品，他是许多大名鼎鼎的在线代码编辑器的基础库。比如以下代码编辑器都是基于codemirror的：

• Google Earth KML sampler

• Eloquent JavaScript‘s console

• The qooxdoo playground

• A cool tutorial about the element

• An online IDE for the Orc programming language

• Google‘s API playground

• Raphaël Live

• JS Bin

• The RokPad plugin for Joomla

• The scraperwiki editor

• jsLinb UI Builder

附注 -- 各种不同语言的Demo演示：

• JavaScript

• XML/HTML

• CSS

• SPARQL

• HTML mixed-mode

• HTML+PHP mixed-mode (courtesy of Yahoo!)

• Python (by Timothy Farrell)

• Lua (by Franciszek Wawrzak)

• Ruby (by Michal Hantl, unfinished)

• SQL (by John Benediktsson)

• PLSQL (by Peter Raganitsch)

• diff (courtesy of Liran Nuna)

• Groovy (by eXo Platform)

• C# (by Boris Gaber and Christopher Buchino)

• OmetaJS (by Eric KEDJI)

• Scheme (by Danny Yoo)

CodeMirror：基于JavaScript的代码编辑器