使用JavaScript获取Openweather forecast

Question

我想用JavaScript获取5天的天气预报。当我执行下面的代码时，我得到＜code＞类型错误：无法读取未定义tohttps://api.openweathermap.org/data/2.5/weather?q=我获得当前天气，没有错误。为什么预测在我的情况下不起作用？我遗漏了什么吗？

JavaScript（我想. then有问题（data=

var activities = document.getElementById('activitySelector');
var main = document.querySelector('#name');
var temp = document.querySelector('.temp');
var desc = document.querySelector('.desc');



activities.addEventListener('change', (e) => {
    fetch('https://api.openweathermap.org/data/2.5/forecast?q='+e.target.value+'&appid=<<<<APIKEY>>>>&cnt=5')
        .then(response => response.json())
        .then(data => {
            var tempValue = data['main']['temp'];
            var nameValue = data['name'];
            var descValue = data['weather'][0]['description'];

            main.innerHTML = nameValue;
            desc.innerHTML = "Desc - "+descValue;
            temp.innerHTML = "Temp - "+tempValue;

        })

        .catch(err => alert(err));
})

HTML：

   <select name="cities" id="activitySelector">
       <div class="options">
           <option class="option" value="warsaw">Warsaw</option>
           <option class="option" value="phoenix">Phoenix</option>
           <option class="option" value="berlin">Berlin</option>
       </div>
   </select>

   <div class="container">
       <div class="card">
           <h1 class="name" id="name"></h1>
           <p class="temp"></p>
           <p class="clouds"></p>
           <p class="desc"></p>
       </div>
   </div>

我试图获取的JSON：

{"cod":"200 "，" message":0，" cnt":5，" list":[{"dt":1618606800，" main":{"temp":279.45，" feels_like":277.97，" temp_min":278.72，" temp_max":279.45，" pressure":1031，" sea_level":1031，" grnd_level":1028，"湿度":56，" temp_kf":0.73}




Answer 1

所以你有

https://api.openweathermap.org/data/2.5/forecast?q=

在文档中，我看到

api.openweathermap.org/data/2.5/forecast/daily?q={city name}&cnt={cnt}&appid={API key}

所以我假设你在你的URL中缺少/daily。

Answer 2

问题只是您取消引用所需值的方式。

data有一个属性list。list是一个对象数组，每个对象都有一个main键，该键指向具有temp键的对象。

例如，您可以抓取所有元素并记录其 main.temp 字段，如下所示：

const data = {
  "cod": "200",
  "message": 0,
  "cnt": 5,
  "list": [{
    "dt": 1618606800,
    "main": {
      "temp": 279.45,
      "feels_like": 277.97,
      "temp_min": 278.72,
      "temp_max": 279.45,
      "pressure": 1031,
      "sea_level": 1031,
      "grnd_level": 1028,
      "humidity": 56,
      "temp_kf": 0.73
    },
    "weather": [{
      "id": 802,
      "main": "Clouds",
      "description": "scattered clouds",
      "icon": "03n"
    }],
    "clouds": {
      "all": 25
    },
    "wind": {
      "speed": 2.06,
      "deg": 80,
      "gust": 6.1
    },
    "visibility": 10000,
    "pop": 0,
    "sys": {
      "pod": "n"
    },
    "dt_txt": "2021-04-16 21:00:00"
  }, {
    "dt": 1618617600,
    "main": {
      "temp": 278.63,
      "feels_like": 277.46,
      "temp_min": 276.98,
      "temp_max": 278.63,
      "pressure": 1031,
      "sea_level": 1031,
      "grnd_level": 1028,
      "humidity": 61,
      "temp_kf": 1.65
    },
    "weather": [{
      "id": 801,
      "main": "Clouds",
      "description": "few clouds",
      "icon": "02n"
    }],
    "clouds": {
      "all": 23
    },
    "wind": {
      "speed": 1.65,
      "deg": 53,
      "gust": 4.49
    },
    "visibility": 10000,
    "pop": 0,
    "sys": {
      "pod": "n"
    },
    "dt_txt": "2021-04-17 00:00:00"
  }, {
    "dt": 1618628400,
    "main": {
      "temp": 276.91,
      "feels_like": 275.48,
      "temp_min": 275.64,
      "temp_max": 276.91,
      "pressure": 1031,
      "sea_level": 1031,
      "grnd_level": 1027,
      "humidity": 66,
      "temp_kf": 1.27
    },
    "weather": [{
      "id": 800,
      "main": "Clear",
      "description": "clear sky",
      "icon": "01n"
    }],
    "clouds": {
      "all": 10
    },
    "wind": {
      "speed": 1.65,
      "deg": 21,
      "gust": 4.06
    },
    "visibility": 10000,
    "pop": 0,
    "sys": {
      "pod": "n"
    },
    "dt_txt": "2021-04-17 03:00:00"
  }, {
    "dt": 1618639200,
    "main": {
      "temp": 275.25,
      "feels_like": 273.27,
      "temp_min": 275.25,
      "temp_max": 275.25,
      "pressure": 1031,
      "sea_level": 1031,
      "grnd_level": 1028,
      "humidity": 67,
      "temp_kf": 0
    },
    "weather": [{
      "id": 800,
      "main": "Clear",
      "description": "clear sky",
      "icon": "01d"
    }],
    "clouds": {
      "all": 1
    },
    "wind": {
      "speed": 1.89,
      "deg": 16,
      "gust": 4.72
    },
    "visibility": 10000,
    "pop": 0,
    "sys": {
      "pod": "d"
    },
    "dt_txt": "2021-04-17 06:00:00"
  }, {
    "dt": 1618650000,
    "main": {
      "temp": 280.37,
      "feels_like": 278.43,
      "temp_min": 280.37,
      "temp_max": 280.37,
      "pressure": 1030,
      "sea_level": 1030,
      "grnd_level": 1027,
      "humidity": 44,
      "temp_kf": 0
    },
    "weather": [{
      "id": 800,
      "main": "Clear",
      "description": "clear sky",
      "icon": "01d"
    }],
    "clouds": {
      "all": 2
    },
    "wind": {
      "speed": 2.84,
      "deg": 39,
      "gust": 4.51
    },
    "visibility": 10000,
    "pop": 0,
    "sys": {
      "pod": "d"
    },
    "dt_txt": "2021-04-17 09:00:00"
  }],
  "city": {
    "id": 2643743,
    "name": "London",
    "coord": {
      "lat": 51.5085,
      "lon": -0.1257
    },
    "country": "GB",
    "population": 1000000,
    "timezone": 3600,
    "sunrise": 1618549331,
    "sunset": 1618599475
  }
}

for (const day of data.list){
   console.log(`Temp: ${day.main.temp}`)
}