使用索引和空格获取json值

Question

我有以下json响应，我想从中读取数据：

{
    "Meta Data": {
        "1. Information": "Daily Prices (open, high, low, close) and Volumes",
        "2. Symbol": "MSFT",
        "3. Last Refreshed": "2018-09-24",
        "4. Output Size": "Full size",
        "5. Time Zone": "US/Eastern"
    },
    "Time Series (Daily)": {
        "2018-09-24": {
            "1. open": "113.0300",
            "2. high": "114.9000",
            "3. low": "112.2175",
            "4. close": "114.6700",
            "5. volume": "25272154"
        },
        "2018-09-21": {
            "1. open": "114.0000",
            "2. high": "115.2900",
            "3. low": "113.5100",
            "4. close": "114.2600",
            "5. volume": "71229698"
        },
        "2018-09-20": {
            "1. open": "112.2800",
            "2. high": "113.8000",
            "3. low": "111.9300",
            "4. close": "113.5700",
            "5. volume": "23714512"
        },
        ...

现在如何通过使用索引来获取Javascript中的值。 我已经尝试过以下行：

price = response['Time Series (Daily)'][1]['4. close'];

为什么这行不通？ 我真的很感谢您的帮助：）