nodejs-ccap

<h1><span style="font-family:Arial, Helvetica, sans-serif;">canvas</span></h1><p><span style="font-family: Arial, Helvetica, sans-serif;">
</span></p><p><span style="font-family: Arial, Helvetica, sans-serif;">var express = require('express');</span></p>var router = express.Router();
module.exports = function (app) {
    app.use('/', router);
 
    router.get('/getVerifyCode', function (req, res) {
        var ccap = require('ccap')({
            width: 256,//set width,default is 256
            height: 60,//set height,default is 60
            offset: 40,//set text spacing,default is 40
            quality: 100,//set pic quality,default is 50
            generate: function () {//Custom the function to generate captcha text
                var items = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ123456789';
                var vcode = '';
                for (var i = 0; i < 4; i++) {
                    vcode += items.substr(parseInt(Math.random() * items.length), 1);
                }
                return vcode;
            }
        });
        var ary = ccap.get();
        var txt = ary[0];
        var buf = ary[1];
        var dataBuffer = new Buffer(buf, 'base64');
        var fs = require("fs");
        fs.writeFile("public/images/out.png", dataBuffer, function (err) {
            if (err) {
                res.send(err);
            } else {
                req.session.vcode = txt.toLowerCase();
                res.end();
            }
        });
    })
}