io.js 2.2.0 发布，此版本值得关注的改进如下：
node: Speed-up require() by replacing usage of fs.statSync() and fs.readFileSync() with internal variants that are faster for this use-case and do not create as many objects for the garbage collector to clean up. #1801.
node: Resolution of pre-load modules (-r or --require) now follows the standard require() rules rather than just resolving paths(Ali Ijaz Sheikh) #1812.
npm: Upgraded npm to v2.11.0. New hooks for preversion, version, and postversion lifecycle events, some SPDX-related license changes and license file inclusions. See the release notes for full details.
更多内容请看发行说明，此版本现已提供下载：https://github.com/nodejs/io.js/archive/v2.2.0.zip。
IO.js 是为 V8 引擎编写的基于事件 IO 的实现。
构建要求：
* `gcc` and `g++` 4.8 or newer, or
* `clang` and `clang++` 3.3 or newer
* Python 2.6 or 2.7
* GNU Make 3.81 or newer
* libexecinfo (FreeBSD and OpenBSD only)
软件详情：https://github.com/nodejs/io.js/blob/master/CHANGELOG.md
来自:开源中国社区
