类与对象

Posted 2021-02-17 suanmei

1、类继承传递参数 （子类修改父类属性）

class Common {
  constructor (name = ‘song‘) {
    this.name = name
  }
}
class Child extends Common {
  constructor (name = ‘child‘) {
    super(name) //  super的参数列表就是父类构造函数的参数列表 如果是空的 则用父类的默认值 放在第一行super
    this.type = ‘child‘
  }
}
var obj = {
  name: new Child(‘hello‘)
}
export default obj

 

 

class Common {
  constructor (name = ‘song‘) {
    this.name = name
  }
  static tell () { //  静态方法
    console.log(‘tell‘)
  }

  get longName () {
    return ‘mk‘ + this.name
  }
  set longName (value) {
    this.name = value
  }
}
class Child extends Common {
  constructor (name = ‘child‘) {
    super(name) //  super的参数列表就是父类构造函数的参数列表 如果是空的 则用父类的默认值 放在第一行super
    this.type = ‘child‘
  }
}
Common.type = ‘test‘ //  静态属性
var v = new Common()
var obj = {
  name: new Child(‘hello‘),
  longName: v.longName,
  tell: Common.tell
}
export default obj