ajax-jquery布尔等式表演有趣

Question

我有一个api从openweathermap.org请求天气数据

var requestWeatherData = function(ipData){
      $.ajax({
        url: "http://api.openweathermap.org/data/2.5/weather",
        dataType: "json",        
        data: {
          q: ipData.city + ',' + ipData.countryCode,
          appid: "cant say"
        },
        success: function(wthrDetails) {                       
          addWeatherIcon(wthrDetails)             
        },
      });

api的回复示例如下：

{"coord":
{"lon":145.77,"lat":-16.92},
"weather":[{"id":803,"main":"Clouds","description":"broken clouds","icon":"04n"}],
"base":"cmc stations",
"main":{"temp":293.25,"pressure":1019,"humidity":83,"temp_min":289.82,"temp_max":295.37},
"wind":{"speed":5.1,"deg":150},
"clouds":{"all":75},
"rain":{"3h":3},
"dt":1435658272,
"sys":{"type":1,"id":8166,"message":0.0166,"country":"AU","sunrise":1435610796,"sunset":1435650870},
"id":2172797,
"name":"Cairns",
"cod":200}

但当我试图通过上述回复获得天气状况时：

var addWeatherIcon = function(weatherDetails) {
        var weatherType = weatherDetails.weather[0].main.toLowerCase();
        console.log(weatherType); //<-- outputs "clouds"
        console.log(typeof weatherType); //<---- outputs string
        console.log(weatherType == "clouds"); // <-- returns false
}

为什么< code > console . log(weather type = = " clouds ")；返回false？这个类是正确的，输出也是正确的，但是仍然返回false。更奇怪的是，有时当网络很慢时，它会返回true？会不会是Ajax需要变慢才能被检测到？。这怎么可能呢？

编辑：我的密码笔：http://codepen.io/nuclearmachine/full/ZKyrVp

Answer 1

天哪，< code >“雷雨”被拼成了< code >“雷雨”。现在，应用程序有时显示正确的原因是因为其他天气模式拼写正确！我觉得自己很蠢，但吸取了教训。上面的问题以云为例，但是我是在我的电脑上测试雷暴的。

Answer 2

天气详情天气[0].主要.到低案例（）==“云”它将只返回真实，请检查您的代码

例如小提琴是

$(document).ready(function(){
var details={  
   "coord":{  
      "lon":145.77,
      "lat":-16.92
   },
   "weather":[  
      {  
         "id":803,
         "main":"Clouds",
         "description":"broken clouds",
         "icon":"04n"
      }
   ],
   "base":"cmc stations",
   "main":{  
      "temp":293.25,
      "pressure":1019,
      "humidity":83,
      "temp_min":289.82,
      "temp_max":295.37
   },
   "wind":{  
      "speed":5.1,
      "deg":150
   },
   "clouds":{  
      "all":75
   },
   "rain":{  
      "3h":3
   },
   "dt":1435658272,
   "sys":{  
      "type":1,
      "id":8166,
      "message":0.0166,
      "country":"AU",
      "sunrise":1435610796,
      "sunset":1435650870
   },
   "id":2172797,
   "name":"Cairns",
   "cod":200
};
alert(details.weather[0].main.toLowerCase()=="clouds");
});

检查一下https://jsfiddle.net/fdxuf7qn/

Answer 3

尝试：

var weatherType = weatherDetails.weather[0].main.toLowerCase().trim();

某处一定有空间。