TypeError: Router.use() requires a middleware function but got a string at Function.use

Question

我是 Node 和 ExpressJs 开发的新手，但是，我无法导入我创建的模块路由器作为练习。

它给我这个错误：

TypeError: Router.use () requires a middleware function but got a string
     at Function.use

我已经尝试了 module.exports 解决方案，但它不起作用。初始化函数也失败了。

以下是我正在使用的版本：
节点版本：v10.19.0
速成版：4.17.2

Index.js

    const express = require('express');
const app = express();
const ProgettoRouting = require("./routing/ProgettoRouting");

app.use("view engine","jade");
app.use(express.static("public"));
//Codifica dati json con questo middlware senza uso
//del pacchetto npm Body Parser
app.use(express.json());

//Con questo milldelware Importiamo il Router Dati
//dove risiedono le funzionalità del progetto
app.use('/route', ProgettoRouting);

//app.use(app.ProgettoRouting);
//ProgettoRouting.initialize(app);

app.listen(3000, () => {console.log("Server in ascolto sulla porta 3000")});

ProgettoRouting.js

const express = require('express');
const router = express.Router();


router.post("/",(res,req) => {
    let firstName = req.body.nome;
    let lastName = req.body.cognome;
    let message = {nome: firstName, cognome: lastName};
    res.render("index",message);
});

module.exports = router;

Answer 1

您需要使用

app.set("view engine","jade");

而不是

app.use("view engine","jade");

因为您打算将 view-engine 属性设置为 jade，而不是设置中间件。

TypeError: Router.use() requires a middleware function but got a string at Function.use

TypeError: Router.use() requires a middleware function but got a string at Function.use

javascript

json

routes

node.js

express