Reflect.construct()

var obj = new Foo(...args);
var obj = Reflect.construct(Foo, args);

function OneClass() {
  this.name = "one";
}

function OtherClass() {
  this.name = "other";
}

// 创建一个对象：
var obj1 = Reflect.construct(OneClass, args, OtherClass);

// 与上述方法等效：
var obj2 = Object.create(OtherClass.prototype);
OneClass.apply(obj2, args);

console.log(obj1.name); // 'one'
console.log(obj2.name); // 'one'

console.log(obj1 instanceof OneClass); // false
console.log(obj2 instanceof OneClass); // false

console.log(obj1 instanceof OtherClass); // true
console.log(obj2 instanceof OtherClass); // true

function OneClass() {
  console.log("OneClass");
  console.log(new.target);
}
function OtherClass() {
  console.log("OtherClass");
  console.log(new.target);
}

var obj1 = Reflect.construct(OneClass, args);
// 输出：
//     OneClass
//     function OneClass { ... }

var obj2 = Reflect.construct(OneClass, args, OtherClass);
// 输出：
//     OneClass
//     function OtherClass { ... }

var obj3 = Object.create(OtherClass.prototype);
OneClass.apply(obj3, args);
// 输出：
//     OneClass
//     undefined

var d = Reflect.construct(Date, [1776, 6, 4]);
d instanceof Date; // true
d.getFullYear(); // 1776