02-node-elm/controller/v1/captchas.js

'use strict';

import captchapng from 'captchapng';

class Captchas {
	constructor(){

	}
	//验证码
	async getCaptchas(req, res, next){
    	const cap = parseInt(Math.random()*9000+1000);
    	const p = new captchapng(80,30, cap);
        p.color(0, 0, 0, 0); 
        p.color(80, 80, 80, 255);
        const base64 = p.getBase64();
        res.cookie('cap', cap, { maxAge: 300000, httpOnly: true });
        res.send({
            status: 1,
        	code: 'data:image/png;base64,' + base64
        });
	}
}

export default new Captchas()