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Java: 从物体中检索关键名称?
原标题:JavaScript: Retrieve key names from an object?

我有:

var x = {  
          a:{a1:"z", a2:"x"},
          b:{b1:"y", b2:"w"}
}

是否有办法回收x以获得“a”和“b”?

我希望该成员的名称,而不是其内容(我不想获得<条码>{a1:“z” a2:“x”>)。

增 编

最佳回答
var names = [];
for(var key in x) {
   if(x.hasOwnProperty(key)) {
      names.push(key);
   }
}
alert(names.join( ,  )); //a, b
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