TypeScript 高级类型

一、高级类型

• class
• 类型兼容性
• 交叉类型
• 泛型和keyof
• 索引签名类型和索引查询类型
• 映射类型

二、class

• 构造函数给变量赋值
• extends 继承
  implement 实现接口

// 感叹号表示虽然没有初始化，但一定会有值
class Person {
  name!: string
  gender = '男'
}

let p = new Person()
p.name = '小乔'
p.gender = '女'
console.log(p)

class Person {
  name: string
  gender: string
  age: number
  constructor(name: string, gender: string, age: number) {
    this.name = name
    this.age = age
    this.gender = gender
  }
  setName: (name: string) => void = (name) => {
    this.name = name
  }
  setAge(age: number) {
    this.age = age
  }
}

let p = new Person('大乔', '女', 18)