nodejs项目本地环境搭建问题，求各路高手大神解答~

结果：问题解决了。 解决方法：项目开发者发给我他那边的node modules，我这边直接用。 原因：项目是别人开发的，我下载代码之后，直接在本地npm install所需依赖库，配置好数据库等，启动服务，一直提示上面说到的错误信息。

if (fns.length === 0) { throw new TypeError(‘app.use() requires middleware functions’); }

@ncuzp express是npm install下载的，提示是209行，下面是代码：

/**

• Proxy Router#use() to add middleware to the app router.
• See Router#use() documentation for details.
• If the fn parameter is an express app, then it will be
• mounted at the route specified.
• @public */

app.use = function use(fn) { var offset = 0; var path = '/';

// default path to '/' // disambiguate app.use([fn]) if (typeof fn !== 'function') { var arg = fn;

while (Array.isArray(arg) && arg.length !== 0) {
  arg = arg[0];
}

// first arg is the path
if (typeof arg !== 'function') {
  offset = 1;
  path = fn;
}

}

var fns = flatten(slice.call(arguments, offset));

if (fns.length === 0) { throw new TypeError('app.use() requires middleware functions'); }

// setup router this.lazyrouter(); var router = this._router;

fns.forEach(function (fn) { // non-express app if (!fn || !fn.handle || !fn.set) { return router.use(path, fn); }

debug('.use app under %s', path);
fn.mountpath = path;
fn.parent = this;

// restore .app property on req and res
router.use(path, function mounted_app(req, res, next) {
  var orig = req.app;
  fn.handle(req, res, function (err) {
    req.__proto__ = orig.request;
    res.__proto__ = orig.response;
    next(err);
  });
});

// mounted an app
fn.emit('mount', this);

}, this);

return this; };

不是提示express有问题嘛，贴express那块代码吧