模块系统
创建模块
- mod1.js
exports.say = function(val){
console.log("say : "+val);
};
- mod2.js
function Hello() {
var num;
this.add = function (val) {
num = val;
};
this.say = function () {
console.log("hello : " + num);
};
};
module.exports = Hello;
- main.js
var mod1 = require("./mod1");
var Hello = require("./mod2");
mod1.say("hello!");
var mod2 = new Hello();
mod2.add(12);
mod2.say();
模块调用规则
原生模块缓存 -> 原生模块目录 -> 文件模块缓存 -> 文件模块目录
函数参数
function say(word) {
console.log(word);
}
function execute(someFunction, value) {
someFunction(value);
}
execute(say, "Hello");
匿名函数
function execute(someFunction, value) {
someFunction(value);
}
execute(function(word){
console.log(word)
},
"Hello");
路由
- 用到两个模块
url 分析地址
querystring 解析参数
手册
https://nodejs.org/api/url.html
https://nodejs.org/api/querystring.html
- router.js
exports.route = function (pathName) {
console.log("route : " + pathName);
};
- 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("Request for " + pathname + " received.");
route(pathname);
response.writeHead(200, { "Content-Type": "text/plain" });
response.write("Hello World");
response.end();
}
http.createServer(onRequest).listen(8888);
console.log("Server has started.");
}
exports.start = start;
- main.js
var server = require("./server");
var router = require("./router");
server.start(router.route);
- 运行
$ node main.js
浏览器输入 http://127.0.0.1:8888/
- 输出
Server has started.
Request for /%EF%BC%8C%E8%BE%93%E5%87%BA%E7%BB%93%E6%9E%9C%E5%A6%82%E4%B8%8B%EF%BC%9A received.
route : /%EF%BC%8C%E8%BE%93%E5%87%BA%E7%BB%93%E6%9E%9C%E5%A6%82%E4%B8%8B%EF%BC%9A
代码
https://github.com/hans007/JavaScriptCodes/tree/master/nodejs-do
