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| abstract class Animal {
eat(){
console.log('eat');
}
abstract sleep(): void;
}
class Dog1 extends Animal{
constructor(name: string) {
super();
this.name = name;
}
name: string
run(){}
sleep(){
console.log('dog sleep');
}
}
let dog1 = new Dog1('wangwang');
dog1.eat();
class Cat extends Animal{
sleep(){
console.log('Cat sleep');
}
}
let cat = new Cat();
let animals: Animal[] = [dog1, cat]
animals.forEach(i=>{
i.sleep();
})
class WorkFlow {
step1(){
return this;
}
step2(){
return this;
}
}
new WorkFlow().step1().step2();
class Myflow extends WorkFlow{
next(){
return this;
}
}
new Myflow().next().step1().step2();
|