express.js 在路由时不显示 console.log 消息

注：我很新表达

var express = require('express');
var app = express();

app.get('/', function(req, res) {
   res.send('id: ' + req.params.id + ' and name: ' + req.params.name);
});
var things = require('./things/things.js');

//both index.js and things.js should be in same directory
app.use('/things', things);
//Simple request time logger
app.use('/',function(req, res, next){
   console.log("A new request received at " + Date.now());

   //This function call is very important. It tells that more processing is
   //required for the current request and is in the next middleware
   //function/route handler.
   next();
});

app.listen(3000);

我正在学习中间件功能，并尝试在访问 localhost:3000 时显示 console.log 消息，但控制台中没有显示任何内容，我在这里缺少什么？

问题在于 Express 将请求按照声明的顺序传递给中间件和路由处理程序。如果它们中的任何一个能够处理请求（通过发回响应），则稍后声明的任何其他匹配的中间件或路由处理程序都不会被调用。

这就是您的情况所发生的情况，您的中间件被声明after路线处理程序。

尝试将中间件移到前面：

app.use('/',function(req, res, next){
   console.log("A new request received at " + Date.now());
   next();
});

app.get('/', function(req, res) {
   res.send('id: ' + req.params.id + ' and name: ' + req.params.name);
});

var things = require('./things/things.js');

app.use('/things', things);