如何从 URL 中的节点.js服务器文件夹获取图像

有人知道如何从 URL 中的 node.js 服务器文件夹中获取图像吗？在我的文件夹结构中，我有文件夹数据，里面有带有图像的子文件夹 img。我想使用 URL 访问此图像，如下所示：

http://localhost:3000/data/img/default.jpg

但是当我将其输入浏览器时，我总是收到此错误：

找不到页面/data/img/default.jpg 不是有效的路径。

服务器.js：

'use strict';
/**
 * Module dependencies.
 */
var init = require('./config/init')(),
    config = require('./config/config'),
    mongoose = require('mongoose');
var express = require('express');
/**
 * Main application entry file.
 * Please note that the order of loading is important.
 */
// Bootstrap db connection
var db = mongoose.connect(config.db, function(err) {
    if (err) {
        console.error(''x1b[31m', 'Could not connect to MongoDB!');
        console.log(err);
    }
});
// Init the express application
var app = require('./config/express')(db);
// Bootstrap passport config
require('./config/passport')();
app.use(express.static('data/img'));
// Start the app by listening on <port>
app.listen(config.port);
// Expose app
exports = module.exports = app;
// Logging initialization
console.log('MEAN.JS application started on port ' + config.port);

快递.js：

'use strict';
/**
 * Module dependencies.
 */
var express = require('express'),
    morgan = require('morgan'),
    bodyParser = require('body-parser'),
    session = require('express-session'),
    compress = require('compression'),
    methodOverride = require('method-override'),
    cookieParser = require('cookie-parser'),
    helmet = require('helmet'),
    passport = require('passport'),
    mongoStore = require('connect-mongo')({
        session: session
    }),
    flash = require('connect-flash'),
    config = require('./config'),
    consolidate = require('consolidate'),
    path = require('path');
module.exports = function(db) {
    // Initialize express app
    var app = express();
    // Globbing model files
    config.getGlobbedFiles('./app/models/**/*.js').forEach(function(modelPath) {
        require(path.resolve(modelPath));
    });
    // Setting application local variables
    app.locals.title = config.app.title;
    app.locals.description = config.app.description;
    app.locals.keywords = config.app.keywords;
    app.locals.facebookAppId = config.facebook.clientID;
    app.locals.jsFiles = config.getJavaScriptAssets();
    app.locals.cssFiles = config.getCSSAssets();
    // Passing the request url to environment locals
    app.use(function(req, res, next) {
        res.locals.url = req.protocol + '://' + req.headers.host + req.url;
        next();
    });
    // Should be placed before express.static
    app.use(compress({
        filter: function(req, res) {
            return (/json|text|javascript|css/).test(res.getHeader('Content-Type'));
        },
        level: 9
    }));
    // Showing stack errors
    app.set('showStackError', true);
    // Set swig as the template engine
    app.engine('server.view.html', consolidate[config.templateEngine]);
    // Set views path and view engine
    app.set('view engine', 'server.view.html');
    app.set('views', './app/views');
    // Environment dependent middleware
    if (process.env.NODE_ENV === 'development') {
        // Enable logger (morgan)
        app.use(morgan('dev'));
        // Disable views cache
        app.set('view cache', false);
    } else if (process.env.NODE_ENV === 'production') {
        app.locals.cache = 'memory';
    }
    // Request body parsing middleware should be above methodOverride
    app.use(bodyParser.urlencoded({
        extended: true
    }));
    app.use(bodyParser.json());
    app.use(methodOverride());
    // Enable jsonp
    app.enable('jsonp callback');
    // CookieParser should be above session
    app.use(cookieParser());
    // Express MongoDB session storage
    app.use(session({
        saveUninitialized: true,
        resave: true,
        secret: config.sessionSecret,
        store: new mongoStore({
            db: db.connection.db,
            collection: config.sessionCollection
        })
    }));
    // use passport session
    app.use(passport.initialize());
    app.use(passport.session());
    // connect flash for flash messages
    app.use(flash());
    // Use helmet to secure Express headers
    app.use(helmet.xframe());
    app.use(helmet.xssFilter());
    app.use(helmet.nosniff());
    app.use(helmet.ienoopen());
    app.disable('x-powered-by');
    // Setting the app router and static folder
    app.use(express.static(path.resolve('./public')));
    // Globbing routing files
    config.getGlobbedFiles('./app/routes/**/*.js').forEach(function(routePath) {
        require(path.resolve(routePath))(app);
    });
    // Assume 'not found' in the error msgs is a 404. this is somewhat silly, but valid, you can do whatever you like, set properties, use instanceof etc.
    app.use(function(err, req, res, next) {
        // If the error object doesn't exists
        if (!err) return next();
        // Log it
        console.error(err.stack);
        // Error page
        res.status(500).render('500', {
            error: err.stack
        });
    });
    // Assume 404 since no middleware responded
    app.use(function(req, res) {
        res.status(404).render('404', {
            url: req.originalUrl,
            error: 'Not Found'
        });
    });
    return app;
};