我在三個檔案中有一些簡單的 javascript 代碼。有我的 server.js，它有
const userRouter = require('./routes/users')
app.use("/",userRouter)
然后是我的中間件 users.js
module.exports = router
最后是 user.js
module.exports = {
User:User,
validateLogin:validateUserLogin,
validateRegister:validateUserRegister,
}
當我的 user.js 只有匯出行時，module.exports = User我的代碼作業得很好。server.js 匯入 users.js，后者匯入 user.js。但是當與我的用戶物件一起匯出函式時，我的請求停止作業。為什么？我怎樣才能解決這個問題？我將 Node.js 與 express 和 mongo db 一起使用。我所有的 HTML 請求都在 users.js 中。
我 server.js 的代碼是
const express = require('express');
const bodyParser = require("body-parser");
const mongoose = require("mongoose");
//just show server is running
const app = express()
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
const PORT = 4000;
app.get("/status", async (req, res) => {
return res.status(400).send("server for GET is running");
});
app.post("/status", async (req, res) => {
return res.status(200).send({
status: "server for POST is running",
message: req.body.message
});
});
app.listen(PORT, function() {
console.log(`server running on port ${PORT}`);
});
const url = "mongodb srv://Admin:[email protected]/ConfusedTom?retryWrites=true&w=majority"
mongoose.connect(url, {
useNewUrlParser: true,
useUnifiedTopology: true,
dbName: "ConfusedTom"
}).then(() => {
console.log("connected successfully to server, using database %s\n", mongoose.connection.$dbName);
}).catch(err => {
console.log(err);
});
const userRouter = require('./routes/users')
app.use("/",userRouter)
這是我的 users.js
const mongoose = require("mongoose");
const express = require("express");
const router = express.Router();
const ObjectId = mongoose.Types.ObjectId;
const Review = require("../models/review.js")
const TVShow = require("../models/tvshows.js")
const { User, validateLogin, validateRegister} = require("../models/user.js")
router.get("/username", async (req, res) => {
console.log("reached!")
var user = await User.findOne({ username: req.body.username });
if (!user) return res.status(400).send("User doesn't exist.");
return res.status(200).send(user)
});
router.post("/register", async(req,res) => {
const { error } = validateRegister(req.body);
if (error) return res.status(400).send(error.details[0].message);
else user = await User.findOne({ username: req.body.username });
if (user) return res.status(400).send("Username already taken.");
//create new user
user = new User({
firstName: req.body.firstName,
lastName: req.body.lastName,
username: req.body.username,
password: req.body.password,
});
user.save();
return res.status(200).send("User registered successfully.");
})
router.post("/login", async (req, res) => {
console.log("reached!")
// validate the request body first
const { error } = validateLogin(req.body);
if (error) return res.status(400).send(error.details[0].message);
//find an existing user
var user = await User.findOne({ username: req.body.username });
if (!user) return res.status(400).send("Username reqired.");
if (user) {
if (user.validatePassword(req.body.password)) {
return res.header.status(200).send("User login successfully");
}
else return res.status(400).send("Password is incorrect");
} else return res.status(400).send("User doesn't exist.");
});
module.exports = router
uj5u.com熱心網友回復：
您更新匯入的內容的問題user.js是您為函式使用了錯誤的名稱。您目前擁有：
const UserStuff = require("../models/user.js")
const User = UserStuff.User;
const validateLogin = UserStuff.validateUserLogin;
const validateregister = UserStuff.validateUserRegister;
但您要匯出的物件是：
module.exports = {
User:User,
validateLogin:validateUserLogin,
validateRegister:validateUserRegister,
}
您使用了錯誤的函式名稱（validateUserLogin而不是validateLogin）。您使用的名稱必須在兩端匹配。所以：
const UserStuff = require("../models/user.js")
const User = UserStuff.User;
const validateLogin = UserStuff.validateLogin;
// ^^^^^^^^^^^^^
const validateregister = UserStuff.validateRegister;
// ^^^^^^^^^^^^^^^^
或更簡潔地說：
const { User, validateLogin, validateRegister} = require("../models/user.js")
轉載請註明出處，本文鏈接：https://www.uj5u.com/qiye/439216.html
標籤：javascript 节点.js 表示