将 json 数组响应更改为 int 数组

Question

我在将 thingspeak 中的数据转换为 json 响应时遇到了很多麻烦。我有一个 url，它的响应给了我很多字段。这是 JSON 的响应：

?({"channel":{"id":XXXXX,"name":"XXXXX","field1":"Temperature","field2":"Humidity","created_at":"2015-11-03T13:12:06Z","updated_at":"2015-11-15T12:07:37Z","last_entry_id":142},"feeds":[{"created_at":"2015-11-14T21:06:16Z","entry_id":136,"field1":"0"},{"created_at":"2015-11-14T21:06:39Z","entry_id":137,"field1":"25"},{"created_at":"2015-11-14T21:06:59Z","entry_id":138,"field1":"24.05"},{"created_at":"2015-11-14T21:07:13Z","entry_id":139,"field1":"24.45"},{"created_at":"2015-11-14T21:08:16Z","entry_id":140,"field1":"24.45"},{"created_at":"2015-11-15T12:06:18Z","entry_id":141,"field1":"24.5"},{"created_at":"2015-11-15T12:07:37Z","entry_id":142,"field1":"21.4"}]})

我想检索每个 field1 数据的最大值和最小值。我一直在阅读，响应不是 int，因此应该转换为 int 数组。

这是我目前的代码：

$.getJSON('http://api.thingspeak.com/channels/'+channel+'/field/1.json?callback=?',
                {key: read_API_key, days: "1"},
                function(data) {
                    $.each(data.feeds, function() {
                        var temp_vals = this.field1;
                        var temp_vals_date = this.created_at;
                        console.log(temp_vals);
                    });
                }
            );

我想在 feed 数组中搜索 field1 数字并保存到 int 数组中，以便在使用 Math.max.apply(Math, temp_vals); 进行数学运算之后使用控制台，将值正确保存到 temp_vals，但我不能使用该函数，出现以下错误：Function.prototype.apply: Arguments list has wrong type。

因此，如何将响应更改为 int 数组或其他能够找到最大值和最小值的东西？另一个快速的问题是，是否有任何方法可以打印 $.each(data.feeds,function(){}); 之外的值，因为我没有找到方法......

更改为 parseInt：

$.getJSON('http://api.thingspeak.com/channels/'+channel+'/field/1.json?callback=?',
                {key: read_API_key, days: "1"},
                function(data) {
                    $.each(data.feeds, function() {
                        var temp_vals = parseInt(this.field1);
                        var temp_vals_date = this.created_at;
                        var temp_max = Math.max.apply(Math, temp_vals);
                        console.log(temp_max);

                        $('#temp1_max').text(temp_max + ' ºC');

                        console.log(temp_vals);
                    });
                }
            );

Answer 1

使用parseInt

var temp_vals = parseInt( this.field1 );

编辑：

$.getJSON('http://api.thingspeak.com/channels/'+channel+'/field/1.json?callback=?',
                {key: read_API_key, days: "1"},
                function(data) {
                 var temp_vals = [];
                    $.each(data.feeds, function() {
                        temp_vals.push( parseInt( this.field1 ) );
                        var temp_vals_date = this.created_at;
                    });
                     var temp_max = Math.max.apply(Math, temp_vals);
                     console.log(temp_max);
                     console.log(temp_vals);
                     $('#temp1_max').text(temp_max + ' ºC');
                }
            );