js获取json对象的键

const jsonObj = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

const keys = Object.keys(jsonObj);
console.log(keys); // 输出: ["name", "age", "city"]

const jsonObj = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

for (let key in jsonObj) {
  if (jsonObj.hasOwnProperty(key)) {
    console.log(key); // 输出: "name", "age", "city"
  }
}

const jsonObj = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

const entries = Object.entries(jsonObj);
const keys = entries.map(entry => entry[0]);
console.log(keys); // 输出: ["name", "age", "city"]

const jsonObj = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

const allKeys = Object.getOwnPropertyNames(jsonObj);
console.log(allKeys); // 输出: ["name", "age", "city"]