new 带prototype的函数
最后更新于：2022-04-02 03:24:28
[TOC]
## new
```
function myNew(Func, ...args) {
const instance = {};
if (Func.prototype) {
Object.setPrototypeOf(instance, Func.prototype)
}
const res = Func.apply(instance, args)
if (typeof res === "function" || (typeof res === "object" && res !== null)) {
return res
}
return instance
}
// 测试
function Person(name) {
this.name = name
}
Person.prototype.sayName = function() {
console.log(`My name is ${this.name}`)
}
const me = myNew(Person, 'Jack')
me.sayName()
console.log(me) // My name is Jack
let person = new Person("Jack");
console.log(person.sayName()); // undefined
```
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