是否有可能獲取此類JSON元素的數據？

Question

舉例來說，如果我有這樣的JSON文件：

{ 
"update" : { 
    "email@gmail.com":{ 
     "1234": {"notfication": "This is testing 1","url": "http://example1.com"}, 
     "4567": {"notfication": "This is testing 3","url": "http://facebook.com"} 
        }, 
    "testing@gmail.com":{ 
     "abcd": {"notfication": "This is testing 1","url": "http://example2.com"}, 
     "efgh": {"notfication": "This is testing 3","url": "http://facebook.com"} 
        } 
} 
} 

是否有可能要求服務器返回的文字：「email@gmail.com」和「testing@gmail.com」？

謝謝

Answer 1

var obj = { 
         "update" : { 
           "email@gmail.com":{ 
            "1234": {"notfication": "This is testing 1","url": "http://example1.com"}, 
            "4567": {"notfication": "This is testing 3","url": "http://facebook.com"} 
               }, 
           "testing@gmail.com":{ 
            "abcd": {"notfication": "This is testing 1","url": "http://example2.com"}, 
            "efgh": {"notfication": "This is testing 3","url": "http://facebook.com"} 
               } 
          } 
          }; 


       var keys = Object.keys(obj.update); 
       console.log(keys[0]); 
       console.log(keys[1]); 

另見朗高的答案here。