ts - 类

还要注意的是，在构造函数的参数上使用public等同于创建了同名的成员变量。

注：public修饰符会引发 Parameter 'firstName' implicitly has an 'any' type.，解决方法是在tsconfig.json文件中，添加"noImplicitAny": false，或者将"strict": true，改为"strict": false

// src/04student.ts
class Student {
   
  fullName: string;
  // public 等同于创建了同名的成员变量
  // constructor (public firstName: string, public lastName: string) {
   
  //   this.fullName = this.firstName + this.lastName
  // }

  firstName: string; // 成员变量
  lastName: string// 成员变量
  constructor (firstName: string, lastName: string) {
   
    this.firstName = firstName
    this.lastName = lastName
    this.fullName = this.firstName + this.lastName
  }
}

interface IPerson {
   
  firstName: string
  lastName: string
}

function greeter2 (user: IPerson): string {
   
  return 'hello' + user.firstName + user.lastName
}

const stu = new Student('成', '三岁')

console.log(greeter2(stu))