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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