在JavaScript中将对象数组修改为新的对象数组

const oldArray = [{ id: 1, name: 'John' }, { id: 2, name: 'Jane' }];
const newArray = oldArray.map(obj => ({ ...obj, age: 30 }));
console.log(newArray);

const oldArray = [{ id: 1, name: 'John' }, { id: 2, name: 'Jane' }];
const newArray = [];
oldArray.forEach(obj => {
  const newObj = { ...obj, age: 30 };
  newArray.push(newObj);
});
console.log(newArray);

const oldArray = [{ id: 1, name: 'John' }, { id: 2, name: 'Jane' }];
const newArray = [];
for (let i = 0; i < oldArray.length; i++) {
  const obj = oldArray[i];
  const newObj = { ...obj, age: 30 };
  newArray.push(newObj);
}
console.log(newArray);