读嵌套对象

我有这样读嵌套对象

var JSON_Object = { 
"Diabites": [ 
    { 
     "Day1": [ 
      { 
       "Breakfast": [ 
        { 
         "food1": "Bread", 
         "food2": "Tea", 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Lunch": [ 
        { 
         "food1": "Bread", 
         "food2": "Tea", 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Dinner": [ 
        { 
         "food1": "Bread", 
         "food2": "Tea", 
         "food3": "Edd" 
        } 
       ] 
      } 
     ] 
    }, 
    { 
     "Day2": [ 
      { 
       "Breakfast": [ 
        { 
         "food1": "Bread", 
         "food2": "Tea", 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Lunch": [ 
        { 
         "food1": "Bread", 
         "food2": "Tea", 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Dinner": [ 
        { 
         "food1": "Bread", 
         "food2": "Tea", 
         "food3": "Edd" 
        } 
       ] 
      } 
     ] 
    } 
] 
}

对象现在，我怎么能使用一些循环打印出来阅读本文件。我尝试以下

alert(JSON_Object.Diabites.length); // Return 1 
alert(JSON_Object.Diabites[0].Day1.length); // Return 3

但也有不同的名称，如Day1, Day2, Day3 ....，所以我怎么能更改部分的循环，就像喜欢

for(var i=0; i<JSON_Object.Diabites.length;i++) 
{ 
    alert(JSON_Object.Diabites[i].Day1.length); 
}

更新JSON对象

var JSON_Object = { 
"Diabites": [ 
    { 
     "Day1": [ 
      { 
       "Breakfast": [ 
        { 
         "food1": "Bread" 
        }, 
        { 
         "food2": "Tea" 
        }, 
        { 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Lunch": [ 
        { 
         "food1": "Bread" 
        }, 
        { 
         "food2": "Tea" 
        }, 
        { 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Dinner": [ 
        { 
         "food1": "Bread" 
        }, 
        { 
         "food2": "Tea" 
        }, 
        { 
         "food3": "Edd" 
        } 
       ] 
      } 
     ] 
    }, 
    { 
     "Day2": [ 
      { 
       "Breakfast": [ 
        { 
         "food1": "Bread" 
        }, 
        { 
         "food2": "Tea" 
        }, 
        { 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Lunch": [ 
        { 
         "food1": "Bread" 
        }, 
        { 
         "food2": "Tea" 
        }, 
        { 
         "food3": "Edd" 
        } 
       ] 
      }, 
      { 
       "Dinner": [ 
        { 
         "food1": "Bread" 
        }, 
        { 
         "food2": "Tea" 
        }, 
        { 
         "food3": "Edd" 
        } 
       ] 
      } 
     ] 
    } 
] 
};

来源

2013-12-11 Blu

[访问/进程（嵌套）对象，数组或JSON的可能重复]（http://stackoverflow.com/questions/11922383/access-process-nested-objects-arrays-or-json）和[如何做我列举了一个JavaScript对象的属性？]（http://stackoverflow.com/q/85992/218196）。 –

请注意，该问题有**没有**与JSON完全相关。这是关于如何在JavaScript中处理数组/对象。 *您如何获得数据（例如，通过JSON）与问题无关。 –

如果你想循环一个JSON的键，你可以这样做：

for(var key in JSON_Object.Diabites[0]){ 

    //key will be Day1,Day2 etc. 
    alert(JSON_Object.Diabites[0][key].length); 

}

但在共享您的JSON结构，你必须使用

for(var i=0;i<JSON_Object.Diabites.length;i++) { 

    for(var key in JSON_Object.Diabites[i]) { 

     //key will be Day1,Day2 etc. 
     alert(key); 
     alert(JSON_Object.Diabites[i][key].length); 

    } 

}

here is a working fiddle如果你有兴趣。

来源

2013-12-11 05:57:33 mithunsatheesh

嘿，这是非常有用的，但我在我的json对象之前犯了一个小错误，现在我更新了我的问题，你可以再看看吗？ – Blu

回答

相关问题