声明方式

interface直接通过关键字+名字+{}方式进行声明

interface Name {
   name:string
}

type是通过关键字+名字+“=”+{}的方式进行声明

type Name = {
   name:string
}

扩展接口

interface通过关键字extends来扩展

interface Animal {
   name:string
}
interface Bear extends Animal {
   honey:boolean
}

const bear:Bear = {
   name:'wine',
   honey:true
}
console.log(bear.name) // wine
console.log(bear.honey) // true

type通过特殊符号&来进行扩展

type Animal = {
   name:string
}
type Bear = Animal & {
   honey:boolean
}

const bear:Bear = {
   name:'wine',
   honey:true
}
console.log(bear.name) // wine
console.log(bear.honey) // true

向现有的类型中添加字段方式不同

interface通过多次声明的方式，来新增或者覆盖原有的字段

interface MyInfo {
   name:string
}
interface MyInfo {
   age:number
}

const M:MyInfo = {
   name:"mengxyz.com",
   age:18
}

通过type创建的类型，不能更改，不能进行多次重复命名进行修改