React
JavaScriptのviewライブラリ
すごい 
インストール
% npm install reactjsvar React = require('react');
// Addons are in separate packages:
var createFragment = require('react-addons-create-fragment');
var immutabilityHelpers = require('react-addons-update');
var CSSTransitionGroup = require('react-addons-css-transition-group');