javascript - 无法从JSON数组检索值

我每个10 seconds从服务器获取数据

var data = { response: {}, calls: 0 };
    var poller = function() {
        $http.get('http://localhost:8080/monitoring/rest/graph/temperature').then(function(r){
            data.response = r.data;
            console.log(r.data);
            extractTemperatureReadings(r.data)
            data.calls++;
            $timeout(poller, 10000)
        });
    }
    poller();

然后我想提取某些值

function extractTemperatureReadings(apiResponse) {
    var readings = {}
    readings['reading'] = apiResponse.map(function(value){value.reading})
    readings['dateTime'] = apiResponse.map(function(value){value.dateTime})

    console.log('Temperature reading: ' + JSON.stringify(readings))
    return readings
}

但是在浏览器console.log上，我看到了

[Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object, Object]
monitoring.js:64 Temperature reading: {"reading":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null],"dateTime":[null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null,null]}

当我单击每个对象时，

0: Object
dateTime: "2015-08-31 19:56:28.335000"
moduleId: "110010 "
reading: "400"
__proto__: Object

我的代码有什么问题？

最佳答案

您从不会在return通话中出现.map

readings['reading'] = apiResponse.map(function(value){ return value.reading })
readings['dateTime'] = apiResponse.map(function(value){ return value.dateTime })

另外，您无需对对象进行字符串化即可在控制台中以前面的文本看到它，只需执行以下操作：

console.log('Temperature reading: ', readings)

关于javascript - 无法从JSON数组检索值，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/32340342/