js json遍历

可以使用JavaScript的for...in循环来遍历JSON对象，示例如下：

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

for (let key in json) {
  console.log(key + ": " + json[key]);
}

输出结果为：

name: John
age: 30
city: New York

如果JSON对象中嵌套了其他JSON对象或数组，可以使用递归来进行遍历，示例如下：

const json = {
  "name": "John",
  "age": 30,
  "city": "New York",
  "skills": {
    "programming": ["JavaScript", "Python", "Java"],
    "language": ["English", "Spanish"]
  }
}

function traverseJSON(obj) {
  for (let key in obj) {
    if (typeof obj[key] === "object") {
      traverseJSON(obj[key]);
    } else {
      console.log(key + ": " + obj[key]);
    }
  }
}

traverseJSON(json);

输出结果为：

name: John
age: 30
city: New York
programming: JavaScript,Python,Java
language: English,Spanish