如何在JavaScript中迭代它们时获取当前JSON属性的名称？

我在变量里面有JSON对象,如下所示：

var chessPieces = {
    "p-w-1" : {
        "role":"pawn","position":{"x":1,"y":2},"state":"free","virgin":"yes"
    },"p-w-2" : {
        "role":"pawn","position":{"x":2,...
};

我正在为每个循环迭代它们：

for (var piece in chessPieces){
    //some code
}

我如何从中获取当前的名称？例如,我们目前在第一个元素(piece = 0)：chessPiece [piece] .GiveMeThename ==>这导致字符串“p-w-1”.

我实际上打算将当前元素传递给函数,因为我需要检查一下,所以它看起来像这样：

//constructor for this function looks like this: function setPiece(piece,x,y);
function setPiece(chessPiece[piece],chessPiece[piece].position.x,chessPiece[piece].position.y){
    //and here I need to get something like
    piece.GiveMeThename ==> which gives me String "p-w-1"
}

我也在我的项目中使用jQuery,所以如果该库中有可用的东西,请告诉我.