006--TypeScript之类

先看ES6中一个简单的类

class Greeter {
  greeting: string
  constructor(msg: string){
    this.greeting = msg
  }
  greet(){
    return 'hello ' + this.greeting
  }
}
let greeter = new Greeter('world!')
console.log(greeter.greet())//hello world!

简单的继承

//简单的继承
class Animal {
  move(distince: number=0){
    console.log(`The animal move ${distince} m`)
  }
}
class Dog extends Animal {
  bark() {
    console.log('woof! woof!')
  }
}

const dog = new Dog()
dog.bark()//woof! woof!
dog.move(12)//The animal move 12 m

稍微复杂一点的继承

class Animal {
  name: string 

  constructor(name) {
    this.name = name 
  }

  move(distance: number){
    console.log(`${this.name} is move ${distance} m`)
  }
}

class Snake extends Animal {
  constructor(name: string){
    super(name)
  }
  move(distance: number=10){
    console.log('Slithering...')
    super.move(distance)
  }
}

class Horse extends Animal {
  constructor(name: string){
    super(name)
  }
  move(distance: number = 35){
    console.log('Gallophing...')
    super.move(distance)
  }
}

let sam = new Snake('sam')
let tommy: Animal = new Horse('tommy')
sam.move()
tommy.move(38)
// Slithering...
// sam is move 10 m
// Gallophing...
// tommy is move 38 m

2019-05-24  15:57:48