Partial 将所有属性转换为可选属性

与 Required 相反，将所有属性转换为可选属性

interface Person {
    name: string,
    age: number,
}
const shuge:Person = {
  name:'树哥'
} // error  Property 'age' is missing in type '{ name: string; }' but required in type 'Person'.
type User = Partial<Person>
const shuge: User={
  name:'树哥'
} // 编译正确