Comments (1)
在这里考虑如下几条
- Fn 作为某个类的构造函数
- neu() 作为关键字new的别名函数
则有
let fn = neu(Fn); // fn = new Fn();
neu的实现:
function neu (Fn) {
if(typeof Fn !== 'function') {
throw new TypeError('Not a constructor');
}
let obj = {};
let result = Fn.call(obj);
let type = typeof result;
if(type === 'object' || type === 'function') {
obj = result
}
Object.setPrototypeOf(obj, Fn.prototype);
return obj;
}
from blog.
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