我使用reactjs作为开发工具，使用mongoDB作为后端数据库。
我的后端反应代码如下：
const express = require("express");
const jwt = require("jsonwebtoken");
const bcrypt = require("bcrypt");
const { User, VerificationCode } = require("../models");
const { isLoggedIn, getLoggedInUserId, generateRefreshToken } = require("./middlewares");
const sendVerificationEMail = require("./bin/send_email").sendVerificationEmail;
require("dotenv").config();
const router = express.Router();
router.post("/register", async (req, res, next) => {
const { email, username, password, first_name, last_name } = req.body;
try {
// Check if the email is duplicating
let existingUser = await User.findOne({ where: { email } });
if (existingUser) {
return res.status(409).json({
success: false,
message: "User already exists.",
});
}
existingUser = await User.findOne({ where: { username } });
if (existingUser) {
return res.status(409).json({
success: false,
message: "Same nickname user exists.",
});
}
const hash = await bcrypt.hash(password, 12);
await User.create({
email,
username,
password: hash,
first_name,
last_name,
});
return res.status(200).json({
success: true,
message: "Signup successful.",
});
} catch (error) {
return res.json({
success: false,
message: "Signup failed.",
});
}
});
// Login
// Create token and return to user (httpOnly cookies)
router.post("/login", async (req, res, next) => {
const { email, password } = req.body;
// Make a inquiry of the user through email
try {
const user = await User.findOne({ where: { email }, raw: true });
if (!user) {
return res.status(401).json({
success: false,
message: "No member exists.",
});
}
// Check password
const isMatch = await bcrypt.compare(password, user.password);
if (isMatch) {
// If the password matches,create JWT payload
const payload = {
uid: user.id,
};
// JWT token create
const token = jwt.sign(payload, process.env.JWT_SECRET, { expiresIn: req.app.get("jwt_expiration") });
// New refresh token and create expiration for it
let refresh_token = generateRefreshToken(req, user.id);
let refresh_token_maxage = new Date() + req.app.get("jwt_refresh_expiration");
// Browswer httpOnly cookie setting
res.cookie("access_token", token, {
// secure: true,
httpOnly: true,
});
res.cookie("refresh_token", refresh_token, {
// secure: true,
httpOnly: true,
});
// Save the account id as key and save in Redis server
req.client.set(
user.id,
JSON.stringify({
refresh_token: refresh_token,
expires: refresh_token_maxage,
}),
req.client.print
);
return res.json({
success: true,
uid: user.id,
message: "Login Successful",
});
} else {
return res.status(401).json({
success: false,
message: "Password's don't match.",
});
}
} catch (error) {
console.error(error);
res.status(401).json({
success: false,
message: "Login Error",
});
}
});
module.exports = router;
我的登录前端代码如下：（Login.js）
import React, { Component } from "react";
import login from "../picture/login.png";
import Form from "react-bootstrap/Form";
import axios from "axios";
export default class SignUp extends Component {
render() {
return (
<div style = {{
backgroundColor:'#f7feff'
}}>
<div class="container h-100">
<div class="row h-100 justify-content-center align-items-center">
<form class="col-6">
<br/><br/><br/>
<h2>Login</h2>
<hr />
<div class="row h-100 justify-content-center align-items-center">
<img src = {login}
width = '550'
height = '200'
alt='Login2'/>
</div>
<Form.Group controlId="formBasicEmail">
<Form.Label>Email address</Form.Label>
<Form.Control type="email" placeholder="Enter email" />
<Form.Text className="text-muted">
We'll never share your email with anyone else.
</Form.Text>
</Form.Group>
<Form.Group controlId="formBasicPassword">
<Form.Label>Password</Form.Label>
<Form.Control type="password" placeholder="Enter password" />
</Form.Group>
<Form.Group controlId="formBasicCheckbox">
<Form.Check type="checkbox" label="Remember me" />
</Form.Group>
<button type="submit" className="btn btn-info btn-block">Submit</button>
<div className = "App-wrapper">
<p className="forgot-password text-right">
<a href="signup"to="/signup">
Sign Up | </a>
<a href="password"to="/pasword">
Find Password</a>
</p>
</div>
</form>
</div>
</div>
</div>
);
}
}
我的注册前端代码是：（Signup.js）
import React, { Component } from "react";
import Form from "react-bootstrap/Form";
import welcome from "../picture/welcome.png";
export default class SignUp extends Component {
render() {
return (
<div style = {{
backgroundColor:'#f7feff'
}}>
<div class="container h-100">
<div class="row h-100 justify-content-center align-items-center">
<form class="col-6">
<br/><br/><br/>
<h2>Sign Up</h2>
<hr />
<div class = "row h-100 justify-content-center align-items-center">
<img src = {welcome}
width = '550'
height = '200'
alt='signup'/>
</div>
<Form.Group controlId="formBasicEmail">
<Form.Label>*Email address</Form.Label>
<Form.Control type="email" placeholder="Enter email" />
</Form.Group>
<Form.Group controlId="formBasicUsername">
<Form.Label>*Username</Form.Label>
<Form.Control placeholder="Enter username" />
</Form.Group>
<Form.Group controlId="formBasicPassword">
<Form.Label>*Password</Form.Label>
<Form.Control type="password" placeholder="Enter password" />
</Form.Group>
<Form.Group controlId="formBasicFirstname">
<Form.Label>*Firstname</Form.Label>
<Form.Control placeholder="Enter firstname" />
</Form.Group>
<Form.Group controlId="formBasicLastname">
<Form.Label>*Lastname</Form.Label>
<Form.Control type placeholder="Enter lastname" />
</Form.Group>
<Form.Group controlId="formBasicTelephone">
<Form.Label>Telephone</Form.Label>
<Form.Control type="number"placeholder="Enter telephone number"/>
</Form.Group>
<Form.Text className="text-muted">
Fields that are marked with asterisk(*) are compulsory.
</Form.Text>
<button type="submit" className="btn btn-info btn-block">Sign Up</button>
<p className="forgot-password text-right">
<a href="login"to="/login">Already registered? sign in?</a>
</p>
</form>
</div>
</div>
</div>
);
}
}
我真的不知道如何使用axios连接后端和前端。登录服务器的URL为localhost：8002 / auth / login，用于注册的地址为：localhost：8002 / auth / signup
答案 0 :(得分：1)
在React组件中，您必须创建一个使用axios调用后端的函数，然后将其作为onClick处理程序添加到提交按钮。
要向axios发送请求，您必须使用axios模块上可用的功能。在您的情况下，可能看起来像这样：
function onSubmit() {
axios.post('localhost:8002/auth/login',
{username: username,
password: password });
}
请注意，axios.post返回了一个Promise，因此您必须等待它/使用.then才能从后端获得响应。使用该功能后，可以将其附加到登录按钮，如下所示：
<button type="submit" className="btn btn-info btn-block" onClick={onSubmit}>Submit</button>
编辑：用户名和密码值当然是用户通过输入字段输入的值。您可以将它们存储在组件的状态中。