在Javascript中更改对象结构和属性

var obj = {};
obj.name = "John"; // 使用点操作符
obj["age"] = 25; // 使用方括号操作符

var obj = { name: "John", age: 25 };
delete obj.age;

var obj = { name: "John", age: 25 };
obj.age = 30;

var obj1 = { name: "John" };
var obj2 = { age: 25 };
var mergedObj = Object.assign({}, obj1, obj2); // 使用Object.assign()方法
var copiedObj = { ...obj1, ...obj2 }; // 使用展开运算符

var obj = {};
Object.defineProperty(obj, "name", {
  value: "John",
  writable: true,
  enumerable: true,
  configurable: true
});