Node.js+express makes web calculator

Environment:

Host: WIN10

express installation:

1. Install express-generator

Enter the command:

npm install -g express-generator

2. Install express

Enter the command:

npm install -g express

3 .Verify whether the installation is successful

Enter the command: express -V

View help: express --help

Create the project:

express -e calculator
cd calculator && npm install

Run the default web page:

Enter the command: npm start or node ./bin/www

The port is configured in /bin/www.

Can perform addition operations.

Source code:

view/index.ejs: Add input box

routes/index.js: Calculate and push the submitted data Result

var express = require('express');
var router = express.Router();

/* GET home page. */
router.get('/', function(req, res, next) {
 res.render('index', {
  title: '计算器V1.0 by jdh',
  numa: 0,
    numb: 0,
    sum: 0
 });
});

router.post('/', function (req, res) {
  console.log("接收:", req.body.num1, req.body.num2);
  var sum = parseFloat(req.body.num1) + parseFloat(req.body.num2);
  console.log('sum = ',sum);

  res.render('index', {
  title: '计算器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;

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