使用React.js和Express.js将表单数据发布到服务器

我才刚开始MERN Stack，目前正在尝试将数据从RegisterModal.js中的表单发布到server.js

I am just beginning in MERN Stack and am currently trying to POST data from a form located in RegisterModal.js to server.js

index.html文件从index.js获取其内容，该index.js呈现App.js，并根据所单击的按钮呈现不同的组件. (这是我的理解)

The index.html file gets its content from index.js which renders App.js and depending on the button clicked different components are rendered. (This is what I understand)

其中之一是RegisterModal.js，我正在尝试将数据从此表单发布到server.js

One of them being RegisterModal.js, I am trying to post data from this form to server.js

两个文件的代码都位于下面，我的项目结构如下. (其余代码位于github http://github.com/yenvanio/testapp 上)

The code for both files are located below and my project structure is as follows. (The rest of the code is located on github http://github.com/yenvanio/testapp)

我遇到的错误是无法发布到/register"，控制台显示找不到错误.

The error I am getting is "Cannot post to /register" and the console gives me a error of not found.

 - .idea
 - build
 - node_modules
 - public
   -  index.html
   -  server.js
 - src
   - components
      - AdminLoginModal.js
      - PopUp.js
      - RegisterModal.js
      - UserLoginModal.js
   - App.js
   - index.js
 - package.json

代码

server.js

Code

server.js

var express = require('express');
var cors = require('cors');
var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var app = express();

var schema = new Schema({
    user: [
        {
            username: String,
            password: String,
            email: String,
        }
    ]

}, {
    collection: 'users'
});

var Model = mongoose.model('Model', schema);
mongoose.connect('mongodb://localhost:27017/dbName');

app.use(bodyParser.urlencoded({
    extended:true
}));

app.use(bodyParser.json());

app.post("/register", function(request, response){
   var username = request.body.username;
   var password = request.body.password;
   var email = request.body.email;
   console.log("Post Received: %s %s %s", username, password, email);
});

var port = process.env.API_PORT || 3000;
// app.use('/api', router);
app.listen(port, function(){
    console.log("Running on port 3000")
})

RegisterModal.js

RegisterModal.js

import React, { Component } from 'react';

class RegisterModal extends Component
{
    render() {
        return(
            <div>
                <form method="post" action="/register">
                    Email Address:<br/>
                    <input type="text" name="email"/><br/>
                    Username:<br/>
                    <input type="text" name="username"/><br/>
                    Password:<br/>
                    <input type="password" name="password"/><br/>
                    <input type="submit" value="Register"/>
                </form>
             </div>
        );
    }
}

export default RegisterModal;