Node. js + express: webpage calculator _ node. js-js tutorial

This article describes how to create a web calculator using node. js + express. For more information, see Environment:

HOST: WIN10

Express installation:

1. Install express-generator

Enter the following command:

npm install -g express-generator

2. Install express

Enter the following command:

npm install -g express

3. verify whether the installation is successful

Enter the command: express-V

View help: express -- help

Project Creation:

express -e calculatorcd calculator && npm install

Run the default webpage:

Run npm start or node./bin/www.

The port is configured in/bin/www.

You can perform addition operations.

Source code:

View/index. ejs: Add input box

      <%= title %>   
              

Routes/index. js: calculates the submitted data and pushes the results.

Var express = require ('express '); var router = express. router ();/* GET home page. */router. get ('/', function (req, res, next) {res. render ('index', {title: 'calculator V1.0 by jdh ', numa: 0, numb: 0, sum: 0}) ;}); router. post ('/', function (req, res) {console. log ("receive:", req. body. num1, req. body. num2); var sum = parseFloat (req. body. num1) + parseFloat (req. body. num2); console. log ('sum = ', sum); res. render ('index', {title: 'calculator V1.0 by jdh ', // numa: req. body. num1, // numb: req. body. num2 numa: req. body. num1, numb: req. body. num2, sum: sum}) ;}); module. exports = router;