[英]I am getting this error when I run run my express app
我在 Express Router 中间件上遇到类型错误。 以下是提到的代码和错误。 有什么帮助吗?
该应用程序运行良好,但是当我在浏览器中点击 URL 时,它通过控制台中的以下错误。
这是我的 app.js 文件
应用程序.js
//jshint esversion:6
const express = require('express');
const bodyParser = require('body-parser');
const app = express();
app.use("view engine", "ejs");
app.get("/", function(req, res) {
// res.send("Hello");
var today = new Date();
console.log(date);
var currentDay = today.getDay();
var day = "";
console.log(currentDay);
if (currentDay === 6 || currentDay === 0) {
// res.send("yay! it's weekend. ");
day = "weekend";
} else {
day = "weekday";
}
res.render("list", {
kindOfDay: day
});
});
app.listen(3000, function() {
console.log("server started at port 3000");
});
这是 list.ejs 文件
列表.ejs
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>to do list</title>
</head>
<body>
<h1>It's a <%= kindOfDay %>!</h1>
</body>
</html>
错误
E:\todoList-v1\node_modules\express\lib\router\index.js:458
throw new TypeError('Router.use() requires a middleware function but
got a ' + gettype(fn))
^
TypeError: Router.use() requires a middleware function but got a string
at Function.use (E:\todoList-v1\node_modules\express\lib\router\index.js:458:13)
at Function.<anonymous> (E:\todoList-v1\node_modules\express\lib\application.js:220:21)
at Array.forEach (<anonymous>)
at Function.use (E:\todoList-v1\node_modules\express\lib\application.js:217:7)
at Object.<anonymous> (E:\todoList-v1\app.js:6:5)
at Module._compile (internal/modules/cjs/loader.js:1133:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1153:10)
at Module.load (internal/modules/cjs/loader.js:977:32)
at Function.Module._load (internal/modules/cjs/loader.js:877:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:74:12)
我得到了上述错误
这个
app.use("view engine", "ejs");
应该
app.set("view engine", "ejs");
app.use
用于应用中间件功能。 要设置 express 变量,您需要使用app.set
。 这就是您收到错误的原因,因为app.use
需要一个中间件函数/回调,例如function(req, res) {...}
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