ts: Interface

Interface is a statement of a series of abstract methods.

definition

TypeScript interface definition:

interface interface_name { 
}

For example

An interface are defined as follows IPerson, and then defines a variable customer, it is of type IPerson.

interface IPerson { 
    firstName:string, 
    lastName:string, 
    sayHi: ()=>string 
} 
 
var customer:IPerson = { 
    firstName:"Tom",
    lastName:"Hanks", 
    sayHi: ():string =>{return "Hi there"} 
} 

console.log(customer.firstName) 
console.log(customer.lastName) 
console.log(customer.sayHi())

Interface inheritance

interface Person { 
   age:number 
} 
 
interface Musician extends Person { 
   instrument:string 
} 
 
var drummer = <Musician>{}; 
drummer.age = 27 
drummer.instrument = "Drums" 
console.log("年龄:  "+drummer.age)
console.log("喜欢的乐器:  "+drummer.instrument)