ts的泛型

// 泛型就是解决 类 接口的复用性
console.log('泛型泛型泛型泛型泛型.............')
// T表示泛型  传入跟返回一致
function getData<T>(value: T): T {
    console.log(value)
    return value
}
getData<number>(123)

// 类的泛型
class MinClass<T> {
    public list: T[] = []
    add(value: T): void {
        this.list.push(value)
    }
    min(): T {
        console.log(this.list)
        return this.list[0]
    }
}

let m1 = new MinClass<number>()
m1.add(1111)
m1.add(222)
m1.add(333)
m1.min()
let m2 = new MinClass<string>()
m2.add('aaa')
m2.add('bb')
m2.add('cc')
m2.min()

// 泛型接口
interface ConfigFn {
    <T>(value: T): T
}
let setData: ConfigFn = function <T>(value: T): T {
    return value
}
console.log(setData<string>('name'))
console.log(setData<number>(111212))

interface ConfigFn1<T> {
    (value: T): T
}
function setData1<T>(value: T): T {
    return value
}
let mySetData1: ConfigFn1<string> = setData1
console.log(mySetData1('name1'))

// 把类作为参数来约束传入的数据
class User {
    username: string | undefined
    password: string | undefined
}
class ArticleCate {
    title: string | undefined
    desc: string | undefined
    status?: number = 12321
    constructor(parmas: {
        title: string | undefined
        desc: string | undefined
        status?: number
    }) {
        this.title = parmas.title
        this.desc = parmas.desc
        this.status = parmas.status
    }
}
class MysqlDb<T> {
    add(log: T): boolean {
        console.log(log)
        return true
    }
    upData(log: T, id: number): boolean {
        console.log(log)
        console.log(id)
        return true
    }
    // 用泛型解决重复代码问题
    // add1(user: User): boolean {
    //     console.log(user)
    //     return true
    // }
    // add2(info: ArticleCate): boolean {
    //   console.log(info)
    //     console.log(info.title)
    //     return true
    // }
}
let u = new User()
u.username = '张三'
u.password = '123456'
let art = new ArticleCate({
    title: '张三',
    desc: '123456',
})
let Db1 = new MysqlDb<User>()
let Db2 = new MysqlDb<ArticleCate>()
Db1.add(u)
Db1.upData(u, 1)
Db2.add(art)
Db2.upData(art, 2)