The container is a singleton module build to store shared services or parameters:
Service
// set service
var endpoint = ReactAdmin.EndPoint('http://192.168.30.20:8000/nodes', {'Accept':'application/json'});
ReactAdmin.Container("enpoint", endpoint);
// get service
var enpoint = ReactAdmin.Container("enpoint");
Parameter
// set parameter
ReactAdmin.Container().setParameter('password', 'azerty');
// get parameter
var password = ReactAdmin.Container().getParameter('password');