生成验证码

服务端插件： svg-captcha
文档地址：https://github.com/produck/svg-captcha/blob/1.x/README_CN.md

const express = require('express');
const router = express.Router();
// 验证码
const svgCaptcha = require('svg-captcha');
router.get('/', (req, res, next) => {
  const capthcha = svgCaptcha.create({
    ignoreChars: 'Oo01liI',
    noise: 20,
    color: true,
  });
  console.log(capthcha);
  res.type('svg');
  res.status(200).send(capthcha.data);
});
module.exports = router;