<script>
  const newFn = function (C, ...args) {
    /**
     * 建立物件，將其__proto__關聯到構造器的prototype
     * 設定原型
     * 判斷返回值
     * 輸出
     * */
    // const obj = Object.create(C.prototype);
    /* 等價於 */
    const obj = {
      __proto__: C.prototype,
    };
    const instance = C.apply(obj, args);
    if (instance && (typeof(instance) === 'object' || typeof(instance) === 'Function')) {
      return instance;
    }
    return obj;
  };

  function Person(name) {
    this.name = name;
  }

  Person.prototype.logName = function () {
    console.log(this.name);
  };

  const o = newFn(Person, '任先陽');
  o.logName();
</script>