UML

• 统一建模语言 Unified Modeling Language
• 软件设计的绘图标准

• 不仅仅是类图，还有很多其他

  画图工具

• MS Visio

• https://www.processon.com

类图

• 三个区域：名称，属性，方法
• 权限描述：+ (public) , # (protected) , - (private)

class People {
  name: string
  age: number
  protected weight: number = 100
  private girlFriend: string = 'xxx'
  constructor(name: string, age: number) {
    this.name = name;
    this.age = age;
  }
  eat () {}
  speak (n: string) {
    console.log(n, this.girlFriend)
    return 100;
  }
}