Object.create()
使用构造函数创建
/**
* @see https://cloud.tencent.com/developer/article/1832376
*/
const createObject = function (proto, propertiesObject) {
if (typeof proto !== "object" && proto !== null) {
throw new Error("the first param must be an object or null");
}
if (typeof propertiesObject === null) {
throw "TypeError";
}
// 创建一个空的构造函数
function Fn() {}
// Fn.prototype 属性指向参数对象 proto，继承 proto 的属性
Fn.prototype = proto;
// 返回 Fn 的实例
const obj = new Fn();
// 处理传参 null 的情况
if (proto === null) {
obj.__proto__ = proto;
}
if (propertiesObject) {
Object.defineProperties(obj, propertiesObject);
}
return obj;
};
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
使用空对象创建
Object.create = function (proto, propertiesObject) {
if (typeof proto != "object" && proto !== null) {
throw new Error("the first param must be an object or null");
}
if (typeof propertiesObject === null) {
throw "TypeError";
}
let obj = {};
obj.__proto__ = proto;
if (propertiesObject) {
Object.defineProperties(obj, propertiesObject);
}
return obj;
};
1
2
3
4
5
6
7
8
9
10
11
12
13
14
2
3
4
5
6
7
8
9
10
11
12
13
14