AngularJS不提供任何機制來直接實現服務的繼承,但是,對於你的情況,你可以使用$provide.decorator延長BaseService
本身或像使用普通JavaScript的另一個的原型一樣使用它。在我的實踐中,爲了使服務具有可配置的狀態和行爲,我使用了providers。在以下所有示例中,控制檯輸出將爲世界。
裝飾
如果你不需要你的模塊中的原BaseService
,你可以裝點它
Plunker
function AlertService() {
this.add = function(level, message) {
switch(level) {
case 'success':
console.log(message);
}
}
}
function BaseService(alertService) {
this.message = "Hello";
this.perform = function() {
alertService.add("success",this.message);
};
}
angular.
module('app',[]).
config(['$provide', function($provide) {
$provide.decorator('BaseService', function($delegate) {
$delegate.message = 'World';
return $delegate;
});
}]).
service('alertService', AlertService).
service('BaseService', ['alertService',BaseService]).
controller('ctrl', ['BaseService', function(baseService) {
baseService.perform();
}]);
原型繼承
Plunker
function AlertService() {
this.add = function(level, message) {
switch(level) {
case 'success':
console.log(message);
}
}
}
function BaseService(alertService) {
this.message = "Hello";
this.perform = function() {
alertService.add("success",this.message);
};
}
function ChildService(BaseService) {
angular.extend(ChildService.prototype, BaseService);
this.message = "World";
}
angular.
module('app',[]).
service('alertService', AlertService).
service('BaseService', ['alertService',BaseService]).
service('ChildService', ['BaseService',ChildService]).
controller('ctrl', ['ChildService', function(ChildService) {
ChildService.perform();
}]);
提供商
Plunker
function AlertService() {
this.add = function(level, message) {
switch(level) {
case 'success':
console.log(message);
}
}
}
function BaseService() {
var message = "Hello";
this.setMessage = function(msg) {
message = msg;
}
function Service(alertService) {
this.perform = function() {
alertService.add("success", message);
};
}
function Factory(alertService) {
return new Service(alertService);
}
this.$get = ['AlertService', Factory];
}
angular.
module('app',[]).
provider('BaseService', BaseService).
config(['BaseServiceProvider', function(baseServiceProvider) {
baseServiceProvider.setMessage('World');
}]).
service('AlertService', AlertService).
controller('ctrl', ['BaseService', function(baseService) {
baseService.perform();
}]);
使用您最喜愛的JavaScript繼承風格,然後將結果對象添加爲服務。請記住,由於服務是單身人士,您可能要添加單個實例或構造函數。 – Sacho 2014-10-29 23:09:35