一起来完成以下步骤:

1. Window上安装deno
2. 运行第一个Hello World 应用
3. 增加Router功能
4. 新增实体类Employee
5. 对实体类进行CRUD

#main.ts

import { Application } from "https://deno.land/x/oak/mod.ts";
import router  from "./router.ts";

const app = new Application();

app.use(router.routes());
app.use(router.allowedMethods());

await app.listen({ port: 8000 });

#router.ts

import { Router,Context } from "https://deno.land/x/oak/mod.ts";
import { getEmployees,getEmployee,addEmployee,updateEmployee,deleteEmployee } from "./employees.ts";

const router = new Router();

router.get("/hello",(context : Context) =>{
    context.response.body="Hello World";
});
router.get("/employees",getEmployees);
router.get("/employee/:id",getEmployee);
router.post("/employee",addEmployee);
router.put("/employee",updateEmployee);
router.delete("/employee/:id",deleteEmployee);

export default router;

#employees.ts

import { Employee } from "./types.ts";
import ShortUniqueId from 'https://cdn.jsdelivr.net/npm/short-unique-id@latest/short_uuid/mod.ts';

let employees :Employee [] =[
    {
        id:"1",
        name:"michael",
        age:24
    },
    {
        id:"2",
        name:"alex",
        age:25
    },
    {
        id:"3",
        name:"deny",
        age:26
    }
];

//获取所有员工
const getEmployees = ({response}:{response:any}) =>{
    response.body = {
        success : true,
        data : employees
    }
}

//获取一个员工
const getEmployee = ({params,response}:{params:{id:string},response:any}) =>{
    const hadEmployee = employees.find(employee => employee.id === params.id);
    if(hadEmployee){
        response.body={
            success:true,
            data:hadEmployee
        }
    }else{
        response.body={
            success:false,
            data:"No employee found"
        }
    }
}

//新增
const addEmployee = async ({ request,response }:{request:any,response:any}) =>{
    const body = await  request.body();
    const newEmployee = body.value;
    const uid = new ShortUniqueId();
    newEmployee.id = uid(); 
    employees.push(newEmployee);
    response.body = {
        success : true,
        msg :newEmployee
    }
}

//修改
const updateEmployee = async ( {request,response }:{request:any,response:any}) =>{

    const body = await  request.body();
    const updateEmployee = body.value;
    if(updateEmployee.id){
        const index = employees.findIndex(e=>e.id === updateEmployee.id);
        if(index !== -1){ //如果员工存在
            console.log("idnex: "+ index);
            employees[index] = updateEmployee;
            response.body = {
                success : true,
                data :updateEmployee
             }
        }else{
            response.body = {
                success : false,
                data :"No Employee found"
             }
        }
    }
}

//删除
const deleteEmployee = ({params,response}:{params:{id:string}, response:any}) =>{
    employees= employees.filter(e => e.id ! === params.id);
 response.body = {
  success : true,
  msg:"Employee "+ params.id + " was deleted"
    }
}

export { getEmployees,getEmployee,addEmployee,updateEmployee,deleteEmployee}

#types.ts

export interface Employee{
    id:string;
    name:string;
    age:number;
}

完