Property access in Javascript can be problematic - especially when dealing with nested Objects and Arrays. Doing it manually and in a safe manner requires tons of boilerplate inside conditionals and results in a defensive style of coding. In this lesson we look at why this is a problem & how to overcome it using the get method from the popular utility library Lodash
var data = { "response": { "body": { "deviceDetail": { "deviceDetails": [ { "handsetIMEI": 7356383, "handsetDateLastUsed": "2019-04-20T01:02:03.812Z", }, { "handsetIMEI": 34534, "handsetDateLastUsed": "2019-04-20T01:02:03.812Z", } ] } } }} const ns = [‘response‘, ‘body‘, ‘deviceDetail‘, ‘deviceDetails‘]; const handsetIMEI = _.get(data, ns.concat([0, ‘handsetIMEI‘])) console.log(handsetIMEI)
[Javascript] Safer property access with Lodash's 'get' method
原文：http://www.cnblogs.com/Answer1215/p/5927740.html