javascript - Nodejs，观察类字段的变化

Question

是否可以在 nodejs 中为类属性创建直接代理观察者？

class User{
    constructor(name){
        this.name = name;
        let pObject = new Proxy(this,{
            set: () => {
                console.log("something changed"); // should be called
                return true;
            }
        })
        Object.assign(this, pObject) // something like this?
    }
}



let user = new User("Mike");
user.name = "Jack"

Answer 1

您只想观察实例上的 setter 吗？您可以返回代理本身:

class User {
  constructor(name) {
    this.name = name;
    let pObject = new Proxy(this, {
      set: (obj, prop, value) => {
        console.log("something changed"); // should be called
        return Reflect.set(obj, prop,value)      // set the property
      }
    })
    return pObject
  }
}



let user = new User("Mike");
user.name = "Jack"
user.state = "Alaska"
console.log(user)
console.log(user instanceof User)