在父类中，如何在继承类中检查或标记方法。例如，我的B类B类扩展了A类。classA{onSomethingHappend(){//howIcancheckthatmethodexist?this.dependedAction();}}classBextendsA{dependedAction(){console.log('dependedAction');}}constb=newB();b.onSomethingHappend();看答案您可以使其抽象：abstractclassA{onSomethingHappend(){this.dependedAction();}abstractdepe

嗨，我想将表单发送到我的端点配置文件，我的问题是在字段用户中：{}，因为我找不到将数组放入此字段的方法。这是我终点的领域：{"id":4,"ci":"123456","photo":"http://127.0.0.1:8000/media/profiles/12809632_10208569440535095_617453747387788113_n_zAUAVMf.jpg","phone_number":"+59177621589","user":{"id":5,"username":"sdanderson","first_name":"ssss","last_name":"ssss"},"