Node.js 流数据

下面的程序演示如何用数据流的方式来梳理文件resource.json：

var fs = require('fs');
var stream = fs.createReadStream('./resource.json');
stream.on('data', function (chunk) {
    console.log(chunk);
});
stream.on('end', function () {
    console.log('finished');
});

下面的程序演示如何在HTTP服务器上读取一张图片的数据流并显示在客户端：

var http = require('http');
var fs = require('fs');
http.createServer(function (req, res) {
    res.writeHead(200, {'Content-Type': 'image/png'});
    fs.createReadStream('./image.png').pipe(res);
}).listen(3000);
console.log('Server running at http://localhost:3000/');