如何使用ExtJS獲取/列出JSON數據的所有字段名稱？

Question

我有這樣的JSON數據：

[ 
{"ID":"1","name":"google","IP":"69.5.33.22","active":"true"}, 
{"ID":"2","name":"bing","IP":"70.5.232.33","active":"false"} 
] 

我想要得到的所有屬性的名稱，如（？）：

名稱，ID，IP，活躍

注：我不知道介意「名稱」和「IP」中有什麼，例如google，70.5.232.33等等。只是，我想要獲取字段本身。

Answer 1

var jsonString = [ 
    {"ID":"1","name":"google","IP":"69.5.33.22","active":"true"}, 
    {"ID":"2","name":"bing","IP":"70.5.232.33","active":"false"} 
]; 
var keyArray = Ext.Object.getKeys(Ext.JSON.decode(jsonString)); 
console.log(keyArray) // ["ID","name","IP","active"] 

Answer 2

解析對象後迭代對象。

js> for(i in {"ID":"1","name":"google","IP":"69.5.33.22","active":"true"}) 
{ 
    print(i); 
} 
ID 
name 
IP 
active 
js>