影响JSON属性中的变量angular2

Question

我想通过角2变量来影响一个JSON属性的值，我试图访问它在我的应用程序组件是这样的：

export class AppComponent{ 

    count : any; 

    constructor(private _getService : GetService) { 

     this._getService.getPosts(this.urlG) 
      .subscribe(
       result => this.actionsG = result, 
       error=> console.error('Error: ' + error), 
       ()=> console.log('finish! ActionsG') 
      ); // getting the JSON FILE 

     this.aCount = this.actionsG.actionList[0].count; 

     // that's what i'm trying to do to get the values of count in the json 
     // file and stock it into aCount.. 
    } 
} 

我的JSON文件：

{ 
    "actionList": { 
     "count": 70, // 
     "list": [ 
      { 
       "Person": { 
        "name": "David", 
        "age": "30", 
        "id": "D5UG8R", 
        ... 

Answer 1

this.aCount = this.actionsG.actionList[0].count; 

是

result => this.actionsG = result 

之前执行

做，而不是

this._getService.getPosts(this.urlG).subscribe(result => { 
    this.actionsG = result; 
    this.aCount = this.actionsG.actionList[0].count; 
}, error=> console.error('Error: ' + error),()=> console.log('finish! ActionsG'));