相关疑难解决方法(0)

如何使用JavaScript向JSON对象添加新属性(元素)？

根据文档,最新节点(节点5+)默认应支持扩展运算符,如下所示:

const newObj = {
        ...oldObj,
        newProperty: 1
      }

我安装了节点5.10.1(例如'node -v'告诉我的那个).但我仍然收到此错误:

c:\[myprojectfolder]>node index.js
c:\[myprojectfolder]\index.js:21
            ...oldObj,
            ^^^

SyntaxError: Unexpected token ...
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:387:25)
    at Object.Module._extensions..js (module.js:422:10)
    at Module.load (module.js:357:32)
    at Function.Module._load (module.js:314:12)
    at Function.Module.runMain (module.js:447:10)
    at startup (node.js:146:18)
    at node.js:404:3

我错过了什么？

这是我的json:

[ { gsm: 'gsm',
  firstName: 'firstname',
  lastName: 'lastname' },
{ gsm: '123456789',
  firstName: 'Mohamed',
  lastName: 'Sameer'},
{ gsm: '987654321',
  firstName: 'Hameed',
  lastName: 'Basha'}]

我希望我的最终输出看起来像:

[ { gsm: 'gsm',
  firstName: 'firstname',
  lastName: 'lastname',
  userKey: 'Key1'},
{ gsm: '123456789',
  firstName: 'Mohamed',
  lastName: 'Sameer',
  userKey: 'Key1'},
{ gsm: '987654321',
  firstName: 'Hameed',
  lastName: 'Basha',
  userKey: 'Key1'}]

我需要使用任何javascript方法,如map等

我正在尝试向数组中的每个对象添加一个属性:

var capitals = [{
    country: "What's the capital of Ecuador?",
    choices: ["Quito", "Caracas", "Panama", "Loja"],
    corAnswer: 0
}, {
    country: "What is the capital of China?",
    choices: ["Shanghai", "Beijing", "Ghangzou", "Hong Kong"],
    corAnswer: 0
}];

应该成为:

var capitals = [{
        country: "What's the capital of Ecuador?",
        choices: ["Quito", "Caracas", "Panama", "Loja"],
        corAnswer: 0,
        global: true
    }, {
        country: "What is the capital of China?",
        choices: ["Shanghai", "Beijing", "Ghangzou", "Hong Kong"],
        corAnswer: 0,
        global: true
    }];

该数组可以包含多个对象.我需要什么样的功能？

我在没有角度或下划线的节点工作,我正在寻找一个有效的普通javascript答案(也许避免循环).我有以下JSON对象数组:

object = [
    {account:2423, user:1564},
    {account:1235, user:1564}
]

我想将以下内容添加到对象中的每个数组:

username:"clientname" 

所以它最终看起来像这样:

object = [
    {account:2423, user:1564, username:"clientname"},
    {account:1235, user:1564, username:"clientname"}
]

这个问题要求避免循环.