1.首先安装typeScript

npm install typescript

2.方便学习安装一个@types/node方便编译ts

npm install @types/node

可以直接使用命令 ts-node index.ts

准备工作完成！！！

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类型的等级

1：any unknown //顶级的类型

2: Object

3: Number String Boolean

4: number string boolean

5: 1   '12313'  false

6: never

如何类型都能赋值给any

let names: any = [];names = 1;let a: number = 1;names = a;a = names;

注意：unknown 只能赋值给any类型和unknown类型

let age: unknown = [];age = names;age = a;// a = age;names = age;

注意：unknown不能读取属性

let datas: unknown = { name: '12313' };console.log(datas.name)//错误

 只有[],{],()=>{}可以赋值给object

// let data1:object = 1231; //错误// let data2:Object = '13321';//错误// let data3:Object = false;//错误let data4: object = [];let data5: object = {};let data6: object = () => 123;console.log(data6)