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                Express框架的核心是對http模塊的再包裝。上面的代碼用Express改寫如下。 ~~~ var express = require('express'); var app = express(); app.get('/', function (req, res) { res.send('Hello world!'); }); app.listen(3000); var express = require("express"); var http = require("http"); var app = express(); app.use(function(request, response) { response.writeHead(200, { "Content-Type": "text/plain" }); response.end("Hello world!\n"); }); http.createServer(app).listen(1337); ~~~ 比較兩段代碼,可以看到它們非常接近,唯一的差別是createServer方法的參數,從一個回調函數變成了一個Epress對象的實例。而這個實例使用了use方法,加載了與上一段代碼相同的回調函數。 Express框架等于在http模塊之上,加了一個中間層,而use方法則相當于調用中間件。
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