javascript - 如何合并对象？

Question

例如，从这两个对象:

var object1 = {
  "color": "yellow",
  "size": null,
  "age": 7,
  "weight": null
}

var object2 = {
  "color": "blue",
  "size": 51,
  "age": null
}

我想要这个(object2 覆盖 object1 除了 null 属性或他没有的属性):

{
  "color": "blue",
  "size": 51,
  "age": 7,
  "weight": null
}

Answer 1

Copy

var src = { name: 'Apple', price: 5};
var dst= angular.copy(src);

• 深拷贝

Extend :

var mergedObject = angular.extend(dst, src1, src2, ...) 

• 浅拷贝

Merge :

var mergedObject = angular.merge(dst, src);

• 从 angular 1.4+ 开始
• 深度(递归)复制

如果不想被null覆盖，可以使用this .

---

Object.assign() :

let movie2 = Object.assign({}, movie1, { episode: 8 });

• 适用于 Angular 2+ (ECMAScript 6)

来源:

• https://docs.angularjs.org/api/ng/function

• http://davidcai.github.io/blog/posts/copy-vs-extend-vs-merge/