日期: 2021/07/29 天气：晴

    1. const express = require('express')
    2. const app = express()
    3. const session = require('express-session')
    4. const svgCaptcha = require('svg-captcha')
    6. // 定义生成验证码函数
    7. function createCode () {
    8.     // 配置背景图片颜色集合
    9.     const colorMap = ['#eeeeee','#edfedf','#eeddff','skyblue','orange','#c8c8c8'] 
    10.     //随机颜色
    11.     const randomColor = colorMap[Math.floor(Math.random() * colorMap.length)]
    12.     const  options ={
    13.         size: 6, // 验证码长度
    14.         ignoreChars: '0oO1lI', // 排除字符
    15.         noise: 2, // 干扰条数
    16.         width: 160,
    17.         height: 50,
    18.         fontSize: 50,
    19.         color: true,
    20.         background: randomColor
    21.     }
    22.     const captcha = svgCaptcha.create(options)
    23.     return captcha
    24. }
    26. app.use(session({
    27.     secret:'Keyboard cat',
    28.     resave: false,
    29.     saveUninitialized: true,
    30.     cookie: {
    31.         secure: false,
    32.         maxAge: 30000
    33.     },
    34.     rolling: true
    35. }))
    37. // 生成
    38. app.get('/getCaptcha', (req, res) => {
    39.     const captchaObj = createCode();
    40.     req.session.captcha = captchaObj.text.toLowerCase();
    41.     res.setHeader('Content-Type', 'text/html');
    42.     res.send(captchaObj.data)
    43. })
    44. //验证
    45. app.get('/valid', (req, res) => {
    46.     const codeSession = req.session.captcha.toLowerCase()
    47.     const code = req.query.code.toLowerCase()
    48.     if (codeSession !== code) { 
    49.     return res.send({ code : 500, success: false })
    50.   }
    51.   return res.send({ code : 200, success: true })
    52. })
    54. app.listen(3000, ()=> {
    55.     console.log('http://localhost:3000')
    56. })