Question

我试图在node.js服务器上调试我的代码，突然发现一些非常奇怪的东西，每个导航器请求都会执行21次app.use回调函数，这是我见过的最奇怪的事情。

现在，我是节点的新手，这是常见的吗？你会问我怎么注意到这一点，我基本上设置了一个名为request的0初始化的计数器变量，并且每次执行回调时我都将它增加1并将其打印在地址栏中以检查当前值，每当我访问localhost时，计数器增加21意味着有21个连续的回调......有什么想法？

//libraries
var app = require('express')(),
    http = require('http').Server(app),
    express = require('express'),
    server = require('http').createServer(app),
    port = process.env.PORT || 3000,
    path = require('path'),
    logger = require('morgan'),
    bodyParser = require('body-parser'),
    mongoose = require('mongoose');
//custom
var databases = require('../common/config/databases'),
    reactivity = require('./reactivity/init'),
    requestValidator = require('./middleware/validateRequest.js'),
    apiConfig = require('./routes/api.js');

//ROUTING
app.all('/api/v1/*', [requestValidator]);//check /api/v1/* requests for an authenthic token

app.use('/', apiConfig);

var request = 0;
app.use(function (req, res, next) {//404
    var err = new Error('Not Found');
    err.status = 404;
    request += 1;
    res.redirect('#404' + request);
    next();
});

app.set('port', 4000);

var server = app.listen(app.get('port'), function () {
        console.log('Express server listening on port ' + server.address().port);
    });

为什么我的app.use每次请求执行21次？

0 个答案: