如何将数据从一个数组/对象推送到另一个数组/对象？

const sourceArray = [1, 2, 3];
const targetArray = [];

for (let i = 0; i < sourceArray.length; i++) {
  targetArray.push(sourceArray[i]);
}

console.log(targetArray);

const sourceArray = [1, 2, 3];
const targetArray = [4, 5, 6];

const newArray = targetArray.concat(sourceArray);

console.log(newArray);

const sourceArray = [1, 2, 3];
const targetArray = [4, 5, 6];

const newArray = [...targetArray, ...sourceArray];

console.log(newArray);

const sourceObject = { name: 'John', age: 30 };
const targetObject = { city: 'New York' };

const newObject = Object.assign(targetObject, sourceObject);

console.log(newObject);