初始化

.gitignore

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+node_modules

app.js

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+const Koa = require("koa");
+const requter = require("./router.js");
+// console.log(requter)
+// import requter from "./bin/router"
+const app = new Koa();
+app.use(async (ctx,next)=>{
+    // await next();
+    ctx.response.body = {a:1};
+    // next()
+    console.log("执行")
+});
+
+
+const bodyParser = require('koa-bodyparser');
+app.use(bodyParser());
+// console.log(requter())
+app.use(requter());
+app.listen(3000);

controllers/login.js

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+var login = async (ctx, next) => {
+    // var name = ctx.params.name;
+    // ctx.response.body = `<h1>Hello, ${name}!</h1>`;
+    ctx.response.body="这是login"
+    next()
+};
+
+module.exports = {
+    'GET /login': login
+};

package.json

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+{
+    "scripts": {
+        "start": "node app.js"
+    },
+    "dependencies": {
+        "fs": "0.0.1-security",
+        "koa": "^2.10.0",
+        "koa-bodyparser": "^4.2.1",
+        "koa-router": "^7.4.0",
+        "nunjucks": "^3.2.0"
+    }
+}

router.js

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+const fs = require("fs")
+function addMapping(router, mapping) {
+    for (var url in mapping) {
+        if (url.startsWith('GET ')) {
+            var path = url.substring(4);
+            router.get(path, mapping[url]);
+            console.log(`register URL mapping: GET ${path}`);
+        } else if (url.startsWith('POST ')) {
+            var path = url.substring(5);
+            router.post(path, mapping[url]);
+            console.log(`register URL mapping: POST ${path}`);
+        } else {
+            console.log(`invalid URL: ${url}`);
+        }
+    }
+}
+
+function addControllers(router,controllers_dir) {
+    var files = fs.readdirSync(__dirname +"/"+ controllers_dir);
+    var js_files = files.filter((f) => {
+        return f.endsWith('.js');
+    });
+
+    for (var f of js_files) {
+        console.log(`process controller: ${f}...`);
+        let mapping = require(__dirname + `/${controllers_dir}/` + f);
+        addMapping(router, mapping);
+    }
+}
+module.exports = function (dir) {
+    let
+        controllers_dir = dir || 'controllers', // 如果不传参数，扫描目录默认为'controllers'
+        router = require('koa-router')();
+    addControllers(router, controllers_dir);
+    return router.routes();
+    // return 1;
+};