text: var svgCaptcha = require('svg-captcha');
  module.exports=function(req,res){
  	var captcha = svgCaptcha.create({
  		ignoreChars:'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
  		noise:0
  	});
  	req.session.captcha = captcha.text;
  	res.set('Content-Type', 'image/svg+xml');
  	res.status(200).send(captcha.data);
  }