Example of extjs store

MyApp.store.Users.js

Ext.define('MyApp.store.Users', {
    extend: 'Ext.data.Store',
    requires: ['MyApp.model.User'],
    model: 'MyApp.model.User',
    storeId: 'Users',
    autoLoad: true,
    proxy: {
        type: 'ajax',
        url: 'php/users/index.json',
        reader: {
            type:'json',
            root: 'users'
        }
    }
});