javascript - 在 express 中加载 css 和 js 时遇到 500 内部服务器错误

Question

我是 NodeJS 的新手，尝试复制书中的程序。 View 引擎是jade，我正在使用Bootstrap。我认为静态路径是正确的。

app.use(express.static(__dirname+'/public'));

但是当我安慰它时，它显示了这个，

C:\Users\Dell\Desktop\express\microblog/public

只有在broswer中尝试访问页面时才会出现问题，激活服务器后不会立即出现，错误代码为500，如下所示，

Cannot read property 'lazyrouter' of undefined

TypeError: Cannot read property 'lazyrouter' of undefined
    at route (C:\Users\Dell\Desktop\express\microblog\node_modules\express\lib\application.js:254:7)
    at Layer.handle [as handle_request] (C:\Users\Dell\Desktop\express\microblog\node_modules\express\lib\router\layer.js:95:5)
    at trim_prefix (C:\Users\Dell\Desktop\express\microblog\node_modules\express\lib\router\index.js:312:13)
    at C:\Users\Dell\Desktop\express\microblog\node_modules\express\lib\router\index.js:280:7
    at Function.process_params (C:\Users\Dell\Desktop\express\microblog\node_modules\express\lib\router\index.js:330:12)
    at next (C:\Users\Dell\Desktop\express\microblog\node_modules\express\lib\router\index.js:271:10)
    at C:\Users\Dell\Desktop\express\microblog\node_modules\express-session\index.js:489:7
    at C:\Users\Dell\Desktop\express\microblog\node_modules\connect-mongo\lib\connect-mongo.js:306:11
    at handleCallback (C:\Users\Dell\Desktop\express\microblog\node_modules\mongodb\lib\utils.js:96:12)
    at C:\Users\Dell\Desktop\express\microblog\node_modules\mongodb\lib\collection.js:1335:5

但实际上 layout.jade 已正确呈现，只有 block 内容区域显示错误。

下面的 app.js

var settings=require('./settings');
var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var session=require('express-session');
var MongoStore=require('connect-mongo')(session);

var User=require('./models/user');
var crypto=require('crypto');

var index = require('./routes/index');
var users = require('./routes/users');
var post = require('./routes/post');
var reg = require('./routes/reg');
var login = require('./routes/login');
var logout = require('./routes/logout');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(session({
    secret: settings.cookieSecret,
    resave: false,
    saveUninitialized: true,
    store: new MongoStore({
        db:settings.db
    })
}));
app.use(app.route);
app.use(express.static(path.join(__dirname,'/public')));
console.log(__dirname+'/public');


app.use('/', index);
app.use('/users', users);
app.use('/post', post);
app.use('/reg', reg);
app.use('/login', login);
app.use('/logout', logout);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500);
  res.render('error');
});

app.use(function (req,res,next) {
    res.locals.user=req.session.user;

    var err=req.flash('error');
    var success=req.flash('success');

    res.locals.err=err.length?err:null;
    res.locals.success=success.length?success:null;

    next();
})

module.exports = app;

` 下面是 layout.jade 的链接部分

link(type='text/css',rel='stylesheet', href='/stylesheets/bootstrap.css')
link(type='text/css',rel='stylesheet', href='/stylesheets/bootstrap-responsive.css')
script(src="/javascripts/jquery.js")
script(src="/javascripts/bootstrap.js")

Answer 1

问题出在路径上。在 Windows 上，路径是用反斜杠而不是正斜杠构造的。

尝试更改此代码

app.use(express.static(__dirname+'/public'));

对此

app.use(express.static(path.join(__dirname, 'public')));

使用 path.join(__dirname, 'public') 将为您处理斜杠或反斜杠。

这里有更多引用资料供您引用。 https://gist.github.com/domenic/2790533

希望对您有所帮助。