带有ExpressJS的Node.js包括要使用的外部JS代码文件

在这里学习NodeJS ...我将这个非常基本的“类”文件放入一个外部JS文件中。如何使所有路由文件和/或其他外部js文件（我也想加载）看到此文件？

/classes/music/usermanager.js

function User(){
    this.email = "";
    this.password = "";
    this.userid = "";
}

function UserManager()
{
    this.user = new User();
}

UserManager.prototype.login = new function (email, password){
    var db = new DbManager();
    db.Open();
    params = {
        $email : email,
        $password : password
    }
    db.serialize(function(){
        db.get("SELECT * FROM Users WHERE email = $email and password =     $password", params, function(err,row) {
        if (!err && row) {
            //log in passed
            this.user.userid = row.user.id;
            this.user.email = row.user.email;
            this.user.password = row.user.password;
            return this.user;
        }
        else if (!err) {
            //log in failed log event
            return null;
        }
        else {
            //error happened through out an event to log the error
            return null;
        }
    });
});
}

/config/strategies/local.strategy.js有关如何在另一个文件中使用它的示例。

var passport = require('passport');
LocalStrategy = require('passport-local').Strategy;

module.exports = function () {
    passport.use(new LocalStrategy({
        usernameField: 'email',
        passwordField: 'password'
    },
    function (email, password, done) {
        //vadliating user here
        var userManager = new UserManager();
        var user = userManager.login(email, password);
        done(null, user);
    }));
};

我试图在我的app.js文件中做类似的事情，并且在编译时说“抛出新的TypeError（'app.use（）需要中间件功能'）;”。我发誓我读过某个地方的文章，您可以做到这一点，但现在找不到资源。

/asp.js

/*load external js library files for application use*/
app.use ("./classes/music/:path*");

尝试组织一个nodejs / expressjs项目时，我仍然感觉这里缺少基本的理解。