如何訪問構造函數中的構造成員？

Question

抱歉，我不確定該如何措辭。.我知道這是某種范圍的問題..但是我要完成的工作是不可能的嗎？

app.factory('SystemStatusConnectionFactory', ['$timeout', '$q', 'SystemStatusFactory', 'SystemStatusOptionsFactory',
function ($timeout, $q, SystemStatusFactory, SystemStatusOptionsFactory) {

    var self = this;

    var SystemStatusConnectionFactory = function (ip, user, pw, options) {
        this.data = {
            count: 0
        };

    this.PollIP = function () {
      console.log(this.data.count);  //WORKS
      $timeout(function () {
            console.log(self.data.count);  //DOES NOT WORK
            console.log(this.data.count);  //DOES NOT WORK
        }, 1000);
    }
   };
... etc

Answer 1

不知道您是否已經從注釋中解決了這個問題（因為我首先不明白為什么不應該這樣做），但是您是否嘗試過對該超時的function參數使用bind()函數？ 這將消除使用var self = this

// ...
this.PollIP = function () {
      console.log(this.data.count);
      $timeout(function () {
            console.log(self.data.count);
            console.log(this.data.count);
        }.bind(this), 1000); // modified line
    }
// ...

Answer 2

在沒有看到更多代碼的情況下，很難確切知道發生了什么。

如果將其與函數綁定，則可以確保它指向您想要的任何上下文。

app.factory('SystemStatusConnectionFactory', ['$timeout', '$q', 'SystemStatusFactory', 'SystemStatusOptionsFactory',
(function ($timeout, $q, SystemStatusFactory, SystemStatusOptionsFactory) {

    var self = this; //this is now pointing to 'app'

    var SystemStatusConnectionFactory = (function (ip, user, pw, options) {

        this.data = {  // this is now pointing to app as well.
            count: 0
        };

        this.PollIP = function () {
            $timeout(function () {
                console.log(self.data.count);  // Self points to app.
                console.log(this.data.count);  // This points to the window object
            }, 1000);
        }
    }).bind(this);
}).bind(app) // Use bind to set app as the context of the function or 'this'

**我假設您希望“此”指代應用**