的Javascript：扁平化的嵌套JSON陣列，同時保持一個鍵值

Question

我有以下的JSON數組：

[{ 
    "eurusd": { 
     "at": 1410438338, 
     "ticker": { 
      "buy": "1.123", 
      "sell": "1.123", 
      "low": "1.123", 
      "high": "1.123", 
      "last": "1.123", 
      "vol": "1.123", 
      "change": "1.123", 
      "change_trend": "up" 
     } 
    }, 
    "eurgbp": { 
     "at": 1410438338, 
     "ticker": { 
      "buy": "1.123", 
      "sell": "1.123", 
      "low": "1.123", 
      "high": "1.123", 
      "last": "1.123", 
      "vol": "1.123", 
      "change": "1.123", 
      "change_trend": "down" 
     } 
    } 
}] 

，需要把它的格式如下：

[{ 
    "market": "eurusd", 
    "currency": "usd", 
    "volume": "1.123", 
    "change": "1.123", 
    "last": "1.123", 
    "high": "1.123", 
    "low": "1.123" 
}, { 
    "market": "eurgbp", 
    "currency": "gbp", 
    "volume": "1.123", 
    "change": "1.123", 
    "last": "1.123", 
    "high": "1.123", 
    "low": "1.123" 
}] 

我所知道的但有一件重要的事情我不能做：

1）貨幣不是原始數組的一部分。我將需要將其從關鍵名稱

到目前爲止我能夠完全壓平原始數組，但我沒有運氣可以省略某些值（例如買入/賣出）以及添加「貨幣」值添加到新陣列。

Answer 1

看起來你並不那麼想要將這個對象扁平化，只需提取ticker值並將市場信息添加到單個項目。對於這一點，我認爲你需要一個特設的做法是：

var items = [], 
    cur, 
    ticker, 
    item; 
for (var cur in data[0]) { 
    ticker = data[0][cur].ticker; 
    item = {}; 
    ["change", "last", "high", "low"].forEach(function (key) { 
     item[key] = ticker[key]; 
    }); 
    item.volume = ticker.vol; 
    item.market = cur; 
    item.currency = cur.substring(3); 
    items.push(item); 
} 

Working jsfiddle