錯誤：權限被拒絕訪問屬性「甩」在垂釣者2

Question

我收到「錯誤：權限被拒絕訪問屬性‘拒絕’」錯誤的垂釣者2.請參見下圖：

火狐的屏幕截圖鉻的

截圖

我已經添加以下代碼中services.js文件

getFooter(){ 
    return this.http.get(this.cons.footer) 
     .map(response => response.json()); 
} 

我用下面的代碼在組件文件

ngOnInit(){ 
this._pageService.getFooter() 
.subscribe(
      data => this.data = data.data, 
      error => console.log(error) 
     ); 
} 

我使用下面JSON文件。

{ 
    "status": "success", 
    "data": { 
     "qwqw":"qqq", 
     "footer_column_first": [ 
      "Alien Education", 
      "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley. ", 
      [ 
       [ 
        "http://facebook.com", 
        "uploads/453085f6fb34252eeb15e26c381daf9b.jpg" 
       ], 
       [ 
        "http://twitter.com", 
        "uploads/8c542d463e812318f71271a41850fd41.jpg" 
       ], 
       [ 
        "http://linkedin.com", 
        "uploads/c29507573b1434ae96783c749248d958.jpg" 
       ], 
       [ 
        "http://youtube.com", 
        "uploads/e311b879e07c9a6a8c924f758566e28f.jpg" 
       ] 
      ] 
     ] 
    } 
} 

我在模板（「.html」）中使用了吹碼。但我得到以下錯誤變量

{{ console.log(data.qwqw) }} 

Answer 1

data?.qwqw 

使用問號將確保var不是未定義