你对new操作符的理解是什么？手动实现一个new方法

function customNew(fn) {  const obj = {};  return function (...args) {    const res = fn.apply(obj, args);    obj.__proto__ = Object.getPrototypeOf(fn);    return typeof res === "object" ? res : obj  }}function Foo(name) {  this.name = name}console.log(customNew(Foo)(2));