js {} 追加

let obj = {}; // 初始化一个空对象
obj.name = "Alice"; // 追加一个名为 'name' 的属性，并赋值为 'Alice'
console.log(obj); // 输出: { name: 'Alice' }

let obj = {};

// 使用点符号追加属性
obj.age = 30;
obj.city = "New York";

// 使用方括号追加属性
obj["occupation"] = "Engineer";
obj["hobbies"] = ["reading", "traveling"];

console.log(obj);
// 输出: { age: 30, city: 'New York', occupation: 'Engineer', hobbies: [ 'reading', 'traveling' ] }

let obj = {};
let additionalProps = { name: "Bob", age: 25 };

Object.assign(obj, additionalProps);

console.log(obj); // 输出: { name: 'Bob', age: 25 }

let obj = {};
let additionalProps = { name: "Charlie", age: 35 };

let newObj = { ...obj, ...additionalProps };

console.log(newObj); // 输出: { name: 'Charlie', age: 35 }