Question

出于某种原因，我无法使用price变量从此JSON中提取：

{
    "list": {
        "meta": {
            "type": "resource-list",
            "start": 0,
            "count": 1
        },
        "resources": [{
            "resource": {
                "classname": "Quote",
                "fields": {
                    "change": "-0.979900",
                    "chg_percent": "-1.955109",
                    "day_high": "49.290001",
                    "day_low": "48.200001",
                    "issuer_name": "Delta Air Lines, Inc.",
                    "issuer_name_lang": "Delta Air Lines, Inc.",
                    "name": "Delta Air Lines, Inc. Common St",
                    "price": "49.140099",
                    "symbol": "DAL",
                    "ts": "1458663972",
                    "type": "equity",
                    "utctime": "2016-03-22T16:26:12+0000",
                    "volume": "7921714",
                    "year_high": "52.770000",
                    "year_low": "34.610000"
                }
            }
        }]
    }
}

我正在使用：this.list.resources.resource.fields.price但它无效

Answer 1

resources是一个数组，因此您需要通过索引访问它：

this.list.resources[0].resource.fields.price;

这显然假设数组中只有1个条目。如果有多个，你需要循环它们：

for (var i = 0; i < this.list.resources.length; i++) {
    var price = this.list.resources[i].resource.fields.price;
    // do something with the price here...
}

Working example

另请注意，由于此值是一个价格，您可能需要考虑使用toFixed(2)将其强制为2位小数，但请注意，这会将类型强制转换为字符串，因此请确保执行任何操作事先对它进行计算。

从API反序列化嵌套的json

1 个答案: