js中的获取json中的值

let jsonObject = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

console.log(jsonObject.name); // 输出: John

let jsonObject = {
  "name": "John",
  "age": 30,
  "city": "New York"
};

let key = "name";
console.log(jsonObject[key]); // 输出: John

// 如果属性名包含特殊字符
let jsonObjectWithSpaces = {
  "first name": "John",
  "last-name": "Doe"
};

console.log(jsonObjectWithSpaces["first name"]); // 输出: John
console.log(jsonObjectWithSpaces["last-name"]); // 输出: Doe

if (jsonObject.hasOwnProperty('age')) {
  console.log(jsonObject.age);
} else {
  console.log('Age is not defined.');
}

let jsonString = '{"name": "John", "age": }'; // 故意制造一个错误的JSON字符串

try {
  let jsonObject = JSON.parse(jsonString);
} catch (error) {
  console.error('Error parsing JSON:', error);
}