js 對象合並

Object.assign(obj1,obj2)

obj1為主對象，obj2為被合並對象

合並完成之后重復的鍵值對將被刪除

const target = { a: 1, b: 2 };
const source = { b: 4, c: 5 };

const returnedTarget = Object.assign(target, source);

console.log(target);
// expected output: Object { a: 1, b: 4, c: 5 }

console.log(returnedTarget);
// expected output: Object { a: 1, b: 4, c: 5 }