使用 JSON 的 JavaScript 编程逻辑

Question

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​​只是显示空白；这让我认为 obj.alldata 是一个字符串而不是 JSON 对象。

当我打印 obj.alldata 时，它会给出如下输出:

{"deviceid":"342","voltage":"14","current":"9","power":"92","status":"1"}

如何正确使用 obj.receivedon 以及 obj.alldata.Voltage？

Answer 1

删除 alldata 值的引号，这样它就不会被视为字符串。

{ "_id": "594fe31b3e158c0e70c9bb3e", "deviceid": "342", "alldata": { "deviceid":"342","voltage":"14","current":"9","power":"92","status":"1"}, "receivedon": "2017/ 06 / 25 21: 51:47", "__v": 0 };