Html 从非迭代JSON对象获取值

我有一个天气预报JSON对象无法从中获取特定值。我正在尝试从下面的JSON获取天气描述

JSON

{
    "request": {
        "type": "City",
        "query": "New York",
        "language": "en",
        "unit": "m"
    },
    "location": {
        "name": "New York",
        "country": "United States of America",
        "region": "New York",
        "lat": "40.714",
        "lon": "-74.006",
        "timezone_id": "America/New_York",
        "localtime": "2020-11-23 10:30",
        "localtime_epoch": 1606127400,
        "utc_offset": "-5.0"
    },
    "current": {
        "observation_time": "03:30 PM",
        "temperature": 11,
        "weather_code": 122,
        "weather_icons": [
            "https://assets.weatherstack.com/images/wsymbols01_png_64/wsymbol_0004_black_low_cloud.png"
        ],
        "weather_descriptions": [
            "Overcast"
        ],
        "wind_speed": 19,
        "wind_degree": 340,
        "wind_dir": "NNW",
        "pressure": 1014,
        "precip": 12,
        "humidity": 77,
        "cloudcover": 100,
        "feelslike": 8,
        "uv_index": 3,
        "visibility": 16,
        "is_day": "yes"
    }
}

HTML

<div>{{this.weatherData | keyvalue }}</div>

预期输出： 阴沉的

实际输出：

---

[对象对象]，[对象对象]，[对象对象]

KeyValue管道标志在您的情况下不起作用。因此，我们必须找到所需的密钥。因为天气描述是一个数组，所以如果有多个元素，就使用循环。下面是您所需值的Html代码

<div *ngIf="this.weatherData && this.weatherData.current && this.weatherData.current.weather_descriptions">
<span *ngFor= "let desc of this.weatherData.current.weather_descriptions">{{desc}}</span>
</div>

{{desc}}

现在获得了预期的输出。但是仍然在控制台窗口中获取以下错误core.js:4442错误类型错误：无法读取DashboardComponent_模板（dashboard.component.html:9）上未定义的属性“current”。您可以在div上添加一些空检查验证。编辑了我的答案。

<div *ngIf="this.weatherData && this.weatherData.current && this.weatherData.current.weather_descriptions">
<span *ngFor= "let desc of this.weatherData.current.weather_descriptions">{{desc}}</span>
</div>