node1.js

//启动NodeJS服务
var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(1337, '127.0.0.1');

node2.js

// 阻塞示例
var res = db.query("select * from T");
output(res);

node3.js

// 非阻塞示例
db.query("select... ", function (res){
    output(res);
});
//do something else

node4.js

//JS休眠
function sleep(milliSeconds) {
    var startTime = new Date().getTime();
    while (new Date().getTime() < startTime + milliSeconds);
}
sleep(10000);