XHR

使用$http(内置)

$http({
  method: 'GET',
  url: '/api/users.json'
}).success(function(data, status, headers, config) {
    // This is called when the response is
    // ready
}).error(function(data, status, headers, config) {
    // This is called when the response
    // comes back with an error status
});

使用$resource

支持标准restful数据模型

使用Restangular

封装性更好，功能更强大