js json添加元素的方法

let jsonObj = {
    "name": "John",
    "age": 30
};

// 添加新属性
jsonObj["city"] = "New York";
jsonObj.country = "USA"; // 省略引号也是可以的，因为属性名是有效的标识符

console.log(jsonObj);
// 输出: { name: 'John', age: 30, city: 'New York', country: 'USA' }

let jsonObj = {
    "name": "John",
    "age": 30
};

let newProperties = {
    "city": "New York",
    "country": "USA"
};

Object.assign(jsonObj, newProperties);

console.log(jsonObj);
// 输出: { name: 'John', age: 30, city: 'New York', country: 'USA' }

let jsonObj = {
    "name": "John",
    "age": 30
};

let newProperties = {
    "city": "New York",
    "country": "USA"
};

jsonObj = { ...jsonObj, ...newProperties };

console.log(jsonObj);
// 输出: { name: 'John', age: 30, city: 'New York', country: 'USA' }

let jsonObj = {};

// 属性名包含特殊字符
jsonObj["user-name"] = "John";

// 属性名是数字
jsonObj[1] = "One";

console.log(jsonObj);
// 输出: { 'user-name': 'John', '1': 'One' }