Node.JS用純JavaScript生成圖片或滑塊式驗證碼功能

2019-11-19 09:22:23

字體：大中小

來源：轉載

供稿：網友

有一些Node.JS圖片生成類庫，比如node-captcha等的類庫，需要c/c++程序生成圖片?？缙脚_部署不是很方便。這里介紹幾個用純JS實現的圖片驗證碼生成模塊。

captchapng

用純JavaScript實現的驗證碼生成模塊。

https://github.com/GeorgeChan/captchapng

安裝簡單，依賴少：

npm install captchapng

示例：

var captchapng = require('captchapng');app.get('/sign/captcha.png', function(req, res) {var captchaNumber  = parseInt(Math.random() * 9000 + 1000)req.session.captcha = captchaNumbervar p = new captchapng(80,20, captchaNumber); // width,height,numeric captchap.color(0, 0, 0, 0); // First color: background (red, green, blue, alpha)p.color(80, 80, 80, 255); // Second color: paint (red, green, blue, alpha)var img = p.getBase64();var imgbase64 = new Buffer(img,'base64');res.writeHead(200, {'Content-Type': 'image/png'});res.end(imgbase64);})

Express + Captcha

為Express框架設計的驗證碼生成模塊。

https://github.com/napa3um/node-captcha

安裝&示例：

$ npm install captchaUsage (for Express 4)'use strict'const express = require('express')const session = require('express-session')const bodyParser = require('body-parser')const captchaUrl = '/captcha.jpg'const captchaId = 'captcha'const captchaFieldName = 'captcha'const captcha = require('./captcha').create({ cookie: captchaId })const app = express()app.use(session({secret: 'keyboard cat',resave: false,saveUninitialized: true,}))app.use(bodyParser.urlencoded({ extended: false }))app.get(captchaUrl, captcha.image())app.get('/', (req, res) => {res.type('html')res.end(`<img src="${ captchaUrl }"/><form action="/login" method="post"><input type="text" name="${ captchaFieldName }"/><input type="submit"/></form>`)})app.post('/login', (req, res) => {res.type('html')res.end(`<p>CAPTCHA VALID: ${ captcha.check(req, req.body[captchaFieldName]) }</p>`)})app.listen(8080, () => {console.log('server started')})

前端滑塊驗證

前端生成軌跡發送到后端驗證，輸入簡單，但是容易被破解。