Value 在配置阶段和运行阶段均可用。

angular.module('app',[])
  .value('endpoint', 'http://some.rest.endpoint') // define
  .run(function(endpoint) {
    // do something with endpoint
    // only available in run phase
  }) 
  .controller('MainCtrl', function(endpoint) {    // inject
    var vm = this;
    vm.endpoint = endpoint;                       // usage
  }); 
<body ng-controller="MainCtrl as vm">
  <div>endpoint = {{ ::vm.endpoint }}</div>
</body>

endpoint = http://some.rest.endpoint