我有一个JSON对象，如下所示：
{"_id":"594fe31b3e158c0e70c9bb3e","deviceid":"342","alldata":"{\"deviceid\":\"342\",\"voltage\":\"14\",\"current\":\"9\",\"power\":\"92\",\"status\":\"1\"}","receivedon":"2017/06/25 21:51:47","__v":0}
问题是，当我尝试输出
obj.alldata.voltage时，它只是空白。这使我认为obj.alldata是字符串而不是JSON对象。当我打印
obj.alldata时，它给出如下输出：{"deviceid":"342","voltage":"14","current":"9","power":"92","status":"1"}
如何正确使用
obj.receivedon和obj.alldata.voltage？ 最佳答案
删除alldata值的引号，因此不会将其视为字符串。
{ "_id": "594fe31b3e158c0e70c9bb3e", "deviceid": "342", "alldata": { "deviceid":"342","voltage":"14","current":"9","power":"92","status":"1"}, "receivedon": "2017/ 06 / 25 21: 51:47", "__v": 0 };