ES6 Class Multiple inheritance

js_extends_multiple.html

<script>
  class Meta {
    static id = 0 // 流水號

    static GetID() {
      return ++Meta.id
    }

    constructor() {
      console.log("meta created.")
      // this.id = Meta.id++ // 先給值後流水後也++
      this.id = Meta.GetID()
    }

    GetID() {
     return this.id
    }
  }

  class Animal extends Meta {
    constructor(species) {
      super()
      this.species = species
    }
    Type() {
      return this.species
    }
  }

  class Person extends Animal {
    constructor(name, age) {
      super("human")
      this.name = name
      this.age = age
    }
    Hello() {
      console.log(`[${this.Type()}] ${this.name}: Hello`)
    }
  }

  for (const curP of [new Person("Carson", 30), new Person("foo", 18)]) {
    curP.Hello()
    console.log(curP.GetID())
    console.log(curP.Type())
  }
</script>