AngularJs服務訪問服務上下文的內容然後（）上下文

Question

我可能是一個初學者的錯誤。我試圖弄清楚如何在this服務的上下文中訪問函數或變量，而在承諾的then()部分。

下面是一些示例代碼：

ndtApp.service("userService", ['$http', 
function($http){ 

    this.saveLoginInfo = function(data){ 
     //do some stuff here. 
    } 

    this.login = function(){ 
     //Login 
     $http.get('http://example.com/userlogin').then(
      function(data){ 
       this.saveLoginInfo(data); 
       //This won't work because 'this' from here is 'window' rather than the service. 
      }, 
      function(data){ 
       //error handling 
      }); 
    } 

}]); 

如何到達saveLoginInfo功能？

Answer 1

當您在JS中輸入函數時，上下文更改爲當前函數。你可以指定this來解決範圍問題。

ndtApp.service("userService", ['$http', 
function($http){ 
var self = this; 
self.saveLoginInfo = function(data){ 
    //do some stuff here. 
} 

self.login = function(){ 
    //Login 
    $http.get('http://example.com/userlogin').then(
     function(data){ 
      self.saveLoginInfo(data); 
      //This won't work because 'this' from here is 'window' rather than the service. 
     }, 
     function(data){ 
      //error handling 
     }); 
} 

}]);