javascript - 使用Jquery GET输出JSON数据

Question

我正在使用 Jquery GET 来获取一些如下所示的 JSON 数据:

{
    "list": {
        "meta": {
            "type": "resource-list",
            "start": 0,
            "count": 1
        },
        "resources": [
            {
                "resource": {
                    "classname": "Quote",
                    "fields": {
                        "change": "-0.400002",
                        "chg_percent": "-1.200485",
                        "day_high": "33.779999",
                        "day_low": "32.549999",
                        "issuer_name": "PayPal Holdings, Inc.",
                        "issuer_name_lang": "PayPal Holdings, Inc.",
                        "name": "PYPL",
                        "price": "32.919998",
                        "symbol": "PYPL",
                        "ts": "1442606400",
                        "type": "equity",
                        "utctime": "2015-09-18T20:00:00+0000",
                        "volume": "16488139",
                        "year_high": "42.550000",
                        "year_low": "30.000000"
                    }
                }
            }
        ]
    }
}

我想获取day_high的值。我使用 Jquery:

jQuery.ajax({
    url: "http://****.com",
    type: "GET",
    dataType: "json",
    async: false,
    success: function (data) {
        var x = JSON.stringify(data.list.resource.change);
       $("p.name").append(x);
       console.log(x.change);
    }
});

在我的控制台中我得到:

Uncaught TypeError: Cannot read property 'change' of undefined

我还尝试了像 data.list.resource[0].change 这样的数组方法，但是输出:

Uncaught TypeError: Cannot read property '0' of undefined 

Answer 1

首先，变量 x 无法通过控制台日志记录语句解释为 JSON，因为 JSON.stringify 将其转换为字符串。其次，看起来你的道路很困惑。它应该是data.list.resources[0].resource.fields.change。