function say(word){
    console.log(word)
}
function execute(someFunction,value){
    someFunction(value)
}

execute(say,"HelloWorld")

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// 匿名函数

function execute(someFunction,value){
    someFunction(value)
}
execute(function(word){console.log(word)},"HelloWorld")

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var http = require("http");

function onRequest(request, response) {
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("Hello World");
  response.end();
}

http.createServer(onRequest).listen(8888);

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路由：根据请求的URL和其他需要的GET及POST参数来执行相应的代码。  我们需要的所有数据都会包含在request对象中。  为了解析这些数据，我们需要url和querystring模块。

                   url.parse(string).query
                                           |
           url.parse(string).pathname      |
                       |                   |
                       |                   |
                     ------ -------------------
https://localhost:8888/start?foo=bar&hello=world
                                ---       -----
                                 |          |
                                 |          |
              querystring.parse(queryString)["foo"]    |
                                            |
                         querystring.parse(queryString)["hello"]

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// 服务器

//  server.js
var http = require("http")
var url = require("url")

function start(route) {
    function onRequest(request,response){
        var pathname = url.parse(request.url).pathname;
        console.log("pathname:"+ pathname)

        route(pathname)

        response.writeHead(200,{"content-Type":"text/plain"})
        response.write("helloWorld")
        response.end();
    }

    http.createServer(onRequest).listen(8888)
    console.log("程序结束")
}

// module.exports = start;
exports.start = start

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// 路由

//  router.js
function route (pathname){
    console.log("About to route a request for:"+pathname)
}

exports.route = route

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//  main.js
var server = require('./hello')
var router = require('./router')
server.start(router.route)