我创建了一个用于注册用户的表单，我想使用body-parser从表单中获取值，但我无法做到。我想使用body-parser从表单中获取值，但我不能这样做。当在控制台打印时，它给出了undefined printed。我不明白我到底做错了什么。我甚至尝试使用postman，但它不工作。这是我的代码。
var express = require('express'),
app = express(),
mongoose = require('mongoose'),
bodyParser = require('body-parser'),
passport = require('passport'),
LocalStrategy = require('passport-local'),
methodOverride = require('method-override'),
flash = require('flash'),
session = require('express-session');
app.get("/about", function(req, res) {
res.render("about");
});
app.get("/register", function(req, res) {
res.render("register");
});
app.post("/register", function(req, res) {
var firstName = req.body.firstName,
lastName = req.body.lastName,
username = req.body.username,
email = req.body.email;
var newUser = new User({
firstName: firstName,
lastName: lastName,
username: username,
email: email
});
console.log(firstName + " " + req.body.password + " " + req.body.c_password);
User.register(newUser, req.body.password, function(err, user) {
if(err) {
return res.render("register", {'error': err.message});
}
passport.authenticate('local')(req, res, function() {
req.flash('success', 'Welcome ' + user.username);
res.redirect('/home');
})
})
});
var port = process.env.PORT || 3000;
app.listen(port, function() {
console.log("Service Running");
});
这是我的表格
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Hotel Site</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.12.0/css/all.css" integrity="sha384-REHJTs1r2ErKBuJB0fCK99gCYsVjwxHrSU0N7I1zl9vZbggVJXRMsv/sLlOAGb4M" crossorigin="anonymous">
<link rel="icon" href="https://www.svgrepo.com/show/12002/hotel.svg" type="image/x-icon">
<link rel="stylesheet" href="/stylesheets/style.css">
<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
</head>
<body>
<div class="container" style="margin-bottom: 4.5rem;">
<h1 style="text-align: center; margin-top: 7rem; margin-bottom: 20px">Sign Up</h1>
<div class="col-lg-6" style="margin: auto;">
<form action="/register" method="POST" enctype="multipart/form-data">
<div class="form-row">
<div class="form-group col-6">
<input class="form-control" type="text" name="firstName" placeholder="First Name" required>
</div>
<div class="form-group col-6">
<input class="form-control" type="text" name="lastName" placeholder="Last Name" required>
</div>
</div>
<div class="form-group">
<input class="form-control" type="text" name="username" placeholder="Username" required>
</div>
<!-- <div class="form-group">
<input class="form-control" type="email" name="email" placeholder="E-mail" required>
</div> -->
<div class="form-group">
<input class="form-control" type="password" name="password" placeholder="Password" required>
</div>
<div class="form-group">
<input class="form-control" type="password" name="c_password" placeholder="Confirm Password" required>
</div>
<div class="form-group">
<button class="btn btn-lg btn-primary btn-block">Submit</button>
</div>
</form>
<a href="/home">Go Back</a>
</div>
</div>
</body>
非常感谢帮助!!!
Express使用中间件，中间件是可以访问传入请求的函数。可以对请求进行修改等。简单的说中间件可以用来做很多事情。
你还没有设置 bodyParser 作为中间件，所以它将无法工作。这可以通过以下方式来实现。
app.use(bodyParser.urlencoded({extended: false})) 对于表格数据app.use(bodyParser.json()) 用于在你的路由之前输入JSON。
这里是ExpressJs关于中间件的指南。https:/expressjs.comenguidewriting -middleware.html。
您已成功导入 body-parser 到您的应用程序中，但您未能使用它。在你使用你的路由之前，请添加以下代码。
app.use(bodyParser.urlencoded({ extended: false }))
希望对你有所帮助。