Question

我有一个基本的ExpressJS服务器，它只是用来记录连接的IP，并提供静态的页面。当我自己连接它时会发生什么，记录请求的IP的中间件会多次重复。如果我删除对next()的调用，则会停止，但它也会阻止管理静态页面的中间件运行。

服务器的代码是：

var express = require('express');

    app = express();

app.use(function(req, res, next) {
    console.log('Received a connection from: ' + req.ip)
    next();
})

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

var port = 55671;
app.listen(port, function() { 
    console.log('Listening on: ' + port);
});

如果我只连接一次，这是标准输出：

Listening on: 55671
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1
Received a connection from: ::ffff:127.0.0.1

我已经尝试过不同的中间件排序，我以为这是以前工作的，但我可能记错了。为什么next（）调用多次调用一个中间件然后再移动到另一个中间件然后停止？

Answer 1

它不是下一个（）多次调用的东西。它只允许您向前移动，否则您的应用程序会在第一个日志声明后停滞。

但是，中间件顺序很重要，这里将为所有访问的静态文件调用日志记录中间件。

如果您不想跟踪那些静态中间件，请将静态中间件放在记录之前。

ExpressJS应用程序中的中间件使用next（）来调用自身

1 个答案: