如何使用护照显示错误信息

我想在使用护照进行身份validation期间显示错误或succuss消息，我在passport.js中的代码是：

var passport = require('passport'); var flash = require('connect-flash'); var LocalStrategy = require('passport-local').Strategy, User = require(process.cwd() + '/app/models/user'); module.exports = function() { passport.use(new LocalStrategy({ usernamelocal: 'userid', passwordlocal: 'password' }, function(username, password, done) { User.findOne({ userid: username }, function(err, user) { if (err) return done(err); if (!user) { console.log("*************user name error"); this.message = "user error"; return done(null, false, { message: 'unknown user' }); } if (user.deleted) { console.log("user deleted error"); return done(null, false, { message: 'unknown user' }); } }); } )); }