2、process进程、path和static

1、process

process.cwd()获取当前文件所在路径
console.log(process.cwd());//C:\Users\chengdong\Documents\vs\Node\fs模块
process.env 获取当前应用所在的环境
console.log(process.env);
console.log(process.execPath);
process.execPath 获取执行文件所在的执行环境

2、path

path模块是node.js自带的模块，主要是为了解决服务器端路径问题而诞生的

const path = require("path")
console.log(__dirname);获取当前文件所在路径

2-1 basename

c:/data/logo.jpg
# logo.jpg
path.basename('c:/data/logo.jpg')

2-2 join-resolve

var s = path.join(__dirname,"static")
console.log(s);
var t = path.resolve(__dirname,"static")
console.log(t);

2-3 extname 获取文件扩展名

console.log(path.extname(process.execPath))

3、static

读取静态资源

yarn add koa-static
const koa = require("koa");
const app = new koa();
const path = require("path");
const static = require("koa-static");
app.use(static(path.join(__dirname,"static")))
app.listen(8000);