AWS Lambda Javascript JSON对象未定义

本文介绍了AWS Lambda Javascript JSON对象未定义的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我的lambda函数由IoT规则(JSON中的MQTT消息)调用.我只是尝试记录这些值，并且顶级点字段可以正常工作，但JSON中的嵌套对象被视为未定义".我试图对它们进行JSON.stringify，但没有成功.有什么想法吗?

My lambda function is called with by an IoT rule (MQTT message in JSON). I am simply trying to log the values, and the top level dot fields work fine, but nested objects in the JSON are seen as "undefined". I tried to JSON.stringify these with no success. Any ideas?

'use strict'; console.log('Loading function'); exports.handler = (event, context, callback) => { console.log('Received event:', JSON.stringify(event, null, 2)); // Complete message console.log('Received event.ApiVersion:',event.ApiVersion); console.log('Received event.CollectionID:',event.CollectionId); console.log('Received event.TagData.Time:',event.TagData.Time); //undefined var TimeObj = {}; TimeObj = event.TagData.Time; console.log('Received event TimeObj:',TimeObj); //undefined };

这是云监视日志/结果:

Here are the cloud watch logs / results:

Loading function Received event: { "FormatId": "TagValues", "ApiVersion": 1, "CollectionId": 2, "TagData": [ { "Time": "2017-09-02T11:06:35.917000+02:00", "Values": { "var1": 16777216, "var2": 7534 } } ] } Received event.ApiVersion: 1 Received event.CollectionID: 2 Received event.TagData.Time: undefined Received event TimeObj: undefined

推荐答案

TagData是一个数组而不是对象，因此TagData.Time返回undefined.

TagData is an array and not an object, so TagData.Time returns undefined.

更改

event.TagData.Time;

收件人

event.TagData[0].Time;