How to develop a simple online investment platform using Node.js

Node.js is a very popular server-side development language. It is efficient, lightweight, and scalable. This article will introduce how to use Node.js to develop a simple online investment platform, and provide specific code examples to help readers better understand and apply.

1. Technical design

When designing an investment platform, we need to consider the following aspects of technology:

1. Page design

The platform needs a visual display page. At this time, you can consider using technologies such as HTML, CSS, and JS to complete it collaboratively.

2. Underlying Framework

When developing Node.js applications, we need to choose a suitable underlying framework. Express is a widely used underlying framework that provides many convenient tools and simple routing configuration, so we choose to use it.

3. Database Storage

Node.js can use many databases, such as MySQL, MongoDB, Redis, etc. We can choose the appropriate database according to our needs. Here, we choose MongoDB as the data storage tool.

2. Project setup

Before actual development, we need to install and configure the relevant development environment. The following are simple steps to build the project:

1. Install Node.js

Node.js official website provides a download page, choose to download and install according to your operating system version. Note that version v12 or above needs to be installed.

2. Initialize the project

Use the command line to enter the directory to be developed and run the following command:

npm init

This command will generate a package.json file , this file contains the dependent libraries we want to use and their version information, etc.

3. Install the Express framework

Run the following command to install the Express framework:

npm install express —-save

4. Install MongoDB

In After downloading MongoDB from the official website, installing and starting it, connect to MongoDB and create a database and a collection. Create data documents in collections for read and write operations within the project.

3. Write code

1. index.js code

This file creates a basic Express application and returns a welcome message to the browser . The code is as follows:

var express = require('express');
var app = express();

app.get('/', function (req, res) {
  res.send('欢迎来到投资平台!');
});

app.listen(3000, function () {
  console.log('应用已启动，访问地址为http://localhost:3000/');
});

After running the file, visit http://localhost:3000/ to see the 'Welcome to the investment platform' message.

2. Database operation

This part mainly performs read and write operations on MongoDB. Before using MongoDB, you need to install mongoose dependencies first. The code is as follows:

var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/test', {useNewUrlParser: true});

var db = mongoose.connection;
db.on('error', console.error.bind(console, '连接错误:'));
db.once('open', function() {
  console.log('数据库连接成功');
});

var UserSchema = new mongoose.Schema({
  email: String,
  password: String,
  name: String,
});

var UserModel = mongoose.model('User', UserSchema);

function addUser(user, callback) {
  var newUser = new UserModel({
    email: user.email,
    password: user.password,
    name: user.name,
  });

  newUser.save(function(err, res){
    if(err) {
      callback({
        success: false,
        error: err,
      })
    } else {
      callback({
        success: true,
        result: res,
      })
    }
  })
}

function getUser(email, callback) {
  UserModel.findOne({
    email: email,
  }, function(err, user) {
    if(err) {
      callback({
        success: false,
        error: err,
      })
    } else {
      callback({
        success: true,
        result: user,
      })
    }
  })
}

module.exports = {
  addUser: addUser,
  getUser: getUser,
};

This part of the code first connects to MongoDB and creates a UserSchema as UserModel, and then defines two functions addUser and getUser for adding and querying users to MongoDB.

Refer to this file in other files to use database operations.

3. Registration

This part mainly implements the user registration function, including submitting forms, verifying forms, etc. The code is as follows:

var express = require('express');
var User = require('../data/user');

var router = express.Router();

router.post('/register', function(req, res) {
  var email = req.body.email;
  var password = req.body.password;
  var name = req.body.name;

  // 省略表单参数的校验
  var user = {
    email: email,
    password: password,
    name: name,
  };

  User.addUser(user, function(result) {
    if(result.success) {
      res.redirect('/register/success');
    } else {
      res.redirect('/register/error');
    }
  })
});

router.get('/register/success', function(req, res) {
  res.send('注册成功');
});

router.get('/register/error', function(req, res) {
  res.send('注册失败');
});

module.exports = router;

After running this file, by submitting the form, the registered user data will be written to the MongoDB database.

4. Summary

This article introduces how to use Node.js to develop a simple online investment platform and provides specific code examples. These knowledge points are necessary for both new and experienced Node.js developers. At the same time, this article only covers the basic functions of the platform. If you want to implement more complex functions, further learning and development are required.

The above is the detailed content of How to develop a simple online investment platform using Node.js. For more information, please follow other related articles on the PHP Chinese website!