class A {
    construct(name) {
        console.log('name: ', name);
        console.log('this: ', this)
        this.name = name;
    }

    testFunction() {
        console.log('testFunction')
    }
}

const singletonify = (OriginalClass) => {
  let i
  return new Proxy(OriginalClass, {
    construct (target, args) {
      console.log('test')
      console.log(args)
      if (!i) i = Reflect.construct(target, args);
      return i
    }
  })
}

singleA = singletonify(A)
a = new singleA()

Reflect.construct(target, args)執(zhí)行的時(shí)候?yàn)楹蝐lass A中的construct沒執(zhí)行