Note: by default, React will be in development mode. The development version includes extra warnings about common mistakes, whereas the production version includes extra performance optimizations and strips all error messages.
To use React in production mode, set the environment variable
production. A minifier that performs dead-code elimination such as UglifyJS is recommended to completely remove the extra code present in development mode.
var React = require('react'); // You can also access ReactWithAddons. var React = require('react/addons');
To run React.JS apps with IE6/IE7 you have to use es5-shims, console-polyfill and queryselector-polyfill from bower.