JavaScript如何循环遍历JSON中的键和值？

Question

我正在尝试遍历以下JSON：

{
"VERSION" : "2006-10-27.a",
"JOBNAME" : "EXEC_",
"JOBHOST" : "Test",
"LSFQUEUE" : "45",
"LSFLIMIT" : "2006-10-27",
"NEWUSER" : "3",
"NEWGROUP" : "2",
"NEWMODUS" : "640"
}

这里的“key”是动态的。我希望同时获得“key =？”和“value =？”。

- Prashant Vhasure

Answer 1

使用 Object.keys() 获取键数组，使用 forEach() 进行迭代。

var data = {
  "VERSION": "2006-10-27.a",
  "JOBNAME": "EXEC_",
  "JOBHOST": "Test",
  "LSFQUEUE": "45",
  "LSFLIMIT": "2006-10-27",
  "NEWUSER": "3",
  "NEWGROUP": "2",
  "NEWMODUS": "640"
};

Object.keys(data).forEach(function(key) {
  console.log('Key : ' + key + ', Value : ' + data[key])
})

- Pranav C Balan

---

非常好的答案！！！ 有没有一种使用映射来实现每个元素都有键和值（内置的东西）的方法？ 我通常会创建一个帮助函数来完成这个任务，但我正在寻找一些可以使用ES6、7的东西。 - Pini Cheyni

Answer 2

你可以使用 Object.keys 来实现。

const yourObject = {
  "VERSION": "2006-10-27.a",
  "JOBNAME": "EXEC_",
  "JOBHOST": "Test",
  "LSFQUEUE": "45",
  "LSFLIMIT": "2006-10-27",
  "NEWUSER": "3",
  "NEWGROUP": "2",
  "NEWMODUS": "640"
}
const keys = Object.keys(yourObject);
for (let i = 0; i < keys.length; i++) {
  const key = keys[i];
  console.log(key, yourObject[key]);
}

或 Object.entries

const yourObject = {
  "VERSION": "2006-10-27.a",
  "JOBNAME": "EXEC_",
  "JOBHOST": "Test",
  "LSFQUEUE": "45",
  "LSFLIMIT": "2006-10-27",
  "NEWUSER": "3",
  "NEWGROUP": "2",
  "NEWMODUS": "640"
}
const entries = Object.entries(yourObject);
for (let [key,value] of entries) {
  console.log(key, value);
}

- Jamiec