標籤：hat 運行 images tle blog doc class 簡單的 sort
為了在程式中示範回調的用法，我們來做一個簡單的HTTP伺服器，讓它實現如下功能：
最終結果如下所示：
一個包含文章標籤的列表：titles.json：
[ "Kazakhstan is a huge country... what goes on there?", "This weather is making me craaazy", "My neighbor sort of howls at night"]
用來渲染部落格標題的HTML模板：template.html：
<!doctype html><html> <head></head> <body> <h1>Latest Posts</h1> <ul><li>%</li></ul> </body></html>
運行程式：
var http = require(‘http‘);var fs = require(‘fs‘);var server = http.createServer(function (req, res) { getTitles(res);}).listen(8000, "127.0.0.1");function getTitles(res) { fs.readFile(‘./titles.json‘, function (err, data) { if (err) return hadError(err, res); getTemplate(JSON.parse(data.toString()), res); });}function getTemplate(titles, res) { fs.readFile(‘./template.html‘, function (err, data) { if (err) return hadError(err, res); formatHtml(titles, data.toString(), res); });}function formatHtml(titles, tmpl, res) { var html = tmpl.replace(‘%‘, titles.join(‘</li><li>‘)); res.writeHead(200, {‘Content-Type‘: ‘text/html‘}); res.end(html);}function hadError(err, res) { console.log(err); res.end(‘Server Error‘);}
Node.js 用回調處理一次性事件
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