一個外匯網站返回的賬戶數據：var account = { id: 12105,type: 'spot',state: 'working',list:[ { currency: 'USD',    type: 'trade',    balance: '6021.0000' },    { currency: 'CNY',        type: 'trade',        balance: '0.0047' },    { currency: 'JPY',        type: 'trade',        balance: '0.0000' },    { currency: 'EUR',        type: 'trade',        balance: '349.3700' },    .. and 22 more currency] }因為有了最后面的那串“ .. and 22 more currency”，不能生成數組，沒法提取中每一項的值。能用什么方法提取list中USD，JPY這些的balance值呢？感謝各位大佬