是否有可能获取此类JSON元素的数据？

Question

举例来说，如果我有这样的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"} 
        } 
} 
} 

是否有可能要求服务器返回的文字：“email@gmail.com”和“testing@gmail.com”？

谢谢

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]); 

另见朗高的答案here。