Jquery 使用json值使switch语句工作

我创建了一个switch语句，用于查找JSON对象的值，并基于该值向控制台提供数据。但是它不起作用。有人能告诉我我错过了什么吗

.controller('GeoCtrl', function($scope, $http) {
    $scope.result = "";
    $http.get('http://api.airvisual.com/v2/city?country=usa&state=arizona&city=phoenix&key=PxJe9btQYWReyQFAm')
      .success(function(data, status, headers,config){
        console.log('data success');
        console.log(data); // for browser console
        $scope.result = data; // for UI
      })
      .error(function(data, status, headers,config){
        console.log('data error');
      })
      .then(function(result){
        things = result.data;
          val = $(things.data.current.pollution.aqius);
          console.log(val);
          var level;
          var health;
          var sport;
          switch (true) {
              case (val < 50):
                  level = "Good";
                  health = "Air quality is considered satisfactory, and air pollution poses little or no risk";
                  sport = "Perfect day to play!";
                  break;
              case (51 <= val && val < 100):
                  level = "Moderate";
                  health = "Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.";
                  sport = "Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.";
                  break;
              case (101 <= val && val < 150):
                  level = "Unhealthy for Sensitive Groups";
                  health = "Members of sensitive groups may experience health effects. The general public is not likely to be affected.";
                  sport = "Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion";
                  break;
              case (151 <= val && val < 200):
                  level = "Unhealthy";
                  health = "Unhealthy Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects";
                  sport = "Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion";
                  break;
              case (201 <= val && val < 300):
                  level = "Very Unhealthy";
                  health = "Health warnings of emergency conditions. The entire population is more likely to be affected.";
                  sport = "Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.";
                  break;
              case (301 <= val):
                  level = "Hazardous";
                  health = "Health alert: everyone may experience more serious health effects";
                  sport = "Everyone should avoid all outdoor exertion";
          }

           console.log(level);
           console.log(health);
           console.log(sport);   
      });
  })

我可以使用console.log获取该值，但无法让switch语句对该值执行任何操作

最新答案：

查看您的代码，问题在于您要返回的承诺。我认为您可能对使用数据作为返回类型感到困惑。如果查看api返回的对象，将得到以下结果集：

{
    "data": {
        "status": "success",
        "data": {
            "city": "Phoenix",
            "state": "Arizona",
            "country": "USA",
            "location": {
                "type": "Point",
                "coordinates": [
                    -112.066299,
                    33.560299
                ]
            },
            "current": {
                "weather": {
                    "ts": "2017-07-17T06:00:00.000Z",
                    "tp": 25,
                    "pr": 1013,
                    "hu": 88,
                    "ws": 6,
                    "wd": 110,
                    "ic": "11n"
                },
                "pollution": {
                    "ts": "2017-07-17T05:00:00.000Z",
                    "aqius": 124,
                    "mainus": "p2",
                    "aqicn": 97,
                    "maincn": "p1"
                }
            }
        }
    },
    "status": 200,
    "config": {
        "method": "GET",
        "transformRequest": [
            null
        ],
        "transformResponse": [
            null
        ],
        "url": "http://api.airvisual.com/v2/city?country=usa&state=arizona&city=phoenix&key=PxJe9btQYWReyQFAm",
        "headers": {
            "Accept": "application/json, text/plain, */*"
        }
    },
    "statusText": "OK"
}

因此，在代码中，您需要将结果设置更改为：

  $scope.result = data.data.data;
  var val = $scope.result.current.pollution.aqius;

这将纠正输出

角度。模块'myApp'，[] .controller'GeoCtrl'，函数$scope，$http{ $scope.result=； //简单的GET请求示例： $http{ 方法：“GET”， 网址：'http://api.airvisual.com/v2/city?country=usa&state=arizona&city=phoenix&key=PxJe9btQYWReyQFAm' }.Then函数成功回调数据、状态、标题、配置{ $scope.result=数据； var val=$scope.result.data.current.pollution.aqius； console.logval； var水平； var健康； 体育； 开关val{ 病例val<50： 水平=良好； 健康=认为空气质量令人满意，空气污染造成的风险很小或没有； 运动=完美的一天！； 打破

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案例51但您从console.logval；？NaN将为所有语句返回false请更正标记。这不是angularjs问题，而是angularjs问题。如果$是jQuery，则val是jQuery对象，而不是数字。val=$things.data.current.pollution.aqius；应该做什么？此外，删除对象转换：val=Numberthings.data.current.pollution.aqius；请发布val的值。尝试使用parseInt确保val为int。同时保留一个默认情况，尽管如此。请参阅，很遗憾，它对我不起作用。控制台说污染未定义