JS中的简单API爬虫无法正常工作

Question

我只是无法理解为什么我要买票~1100USD而不是~4300。 查看当前的股票代码：

{"btcusd":{"high":"4380.15","low":"4205.38","volume":"5577.65704","last":"4286.85","bid":"4286.85","ask":"4290.85"}

这是我的代码：

var urlLakeBtc = "https://api.LakeBTC.com/api_v2/ticker";
request(
    {
        url: urlLakeBtc,
        json: true
    },
    function (error, response, body) {
        if (!error && response.statusCode === 200) {
            var valuesArray = [];
            for (var key in body) {
                var obj = body[key];
                var currency2 = key;
                var buy = obj.ask;
                var sell = obj.bid;

                valuesArray.push([15, 'BTC', currency2, buy, sell]);
            }
        }
    }
)

问题是，obj.ask为什么obj.bid和currency2 = btcusd错误？