什么是node.js
编写高性能网络服务器的JS工具包（用js开发服务端程序）
单线程、异步、事件驱动
特点：快、耗内存
框架
express、koa、Hapi、以及express基础上的sails
node的安装
http://nodejs.cn/
是否成功：
第一个hello程序
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| var http = require('http');
http.createServer(function(request,response){
response.writeHead(200,{'Content-Type': 'text/html; charset=utf-8'});
if (request.url!=="/favicon.ico") { //清除第二次访问
console.log('访问');
response.write('hello,world');
response.end('你好，世界');
}
}).listen(8000);
console.log('Server running at http://localhost:8000/');
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调用函数
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| var http = require('http');
var otherfun = require("./models/other_func.js");
http.createServer(function(request,response){
response.writeHead(200,{'Content-Type': 'text/html; charset=utf-8'});
if (request.url!=="/favicon.ico") {
//fun1(response);
otherfun.fun2(response);
otherfun.fun3(response);
//用字符串调用对应函数
// otherfun.fun2(response);
// otherfun.fun3(response);
funname = 'fun3';
otherfun[funname](response);
response.end('');
}
}).listen(8000);
console.log('Server running at http://10.75.68.123:8000/');
function fun1(res){ // 本文件函数
console.log("fun1");
res.write("hello,我是fun1");
}
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关于被调用的函数：
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| //只支持一个函数
function fun2(res){
console.log("fun2");
res.write("hello,我是fun2");
}
module.exports = fun2;
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| //支持多个函数
module.exports={
fun2:function(res){
console.log("fun2");
res.write("hello,我是fun2");
},
fun3:function(res){
console.log("fun3");
res.write("hello,我是fun3");
}
}
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调用模块
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| var http = require('http');
// var User = require("./models/User");
var Teacher = require("./models/Teacher");
http.createServer(function(request,response){
response.writeHead(200,{'Content-Type': 'text/html; charset=utf-8'});
if (request.url!=="/favicon.ico") {
teacher = new Teacher(1,"张三",20);
teacher.enter();
teacher.teach(response);
// user.id=1;
// user.name="张三";
// user.age=20;
// user.enter();
response.end('');
}
}).listen(8000);
console.log('Server running at http://localhost:8000/');
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路由初步
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| var http = require('http');
var url = require("url");
var router = require("./router");
http.createServer(function(request,response){
response.writeHead(200,{'Content-Type': 'text/html; charset=utf-8'});
if (request.url!=="/favicon.ico") {
var pathname=url.parse(request.url).pathname;
pathname = pathname.replace(/\//,''); //替换掉前面的"/"
router[pathname](request,response);
console.log(pathname);
response.end('');
}
}).listen(8000);
console.log('Server running at http://10.75.68.123:8000/');
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读文件
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| var http = require('http');
var url = require('url');
var router = require('./router');
// var optfile = require("./models/optfile");
http.createServer(function(request,response){
response.writeHead(200,{'Content-Type': 'text/html; charset=utf-8'});
if (request.url!=="/favicon.ico") {
var pathname=url.parse(request.url).pathname;
pathname = pathname.replace(/\//,''); //替换掉前面的"/"
router[pathname](request,response);
/*
// optfile.readfileSync('./views/login.html');
// optfile.readFile('./views/login.html');
function recall(data){
response.write(data);
response.end('ok'); //不写则没有http协议尾
}
optfile.readFile('./views/login.html',recall);
// optfile.readFile('C:\inetpub\wwwroot\HN_NTZJS01/index.html',recall);
console.log("主程序执行完毕");
*/
}
}).listen(8000);
console.log('Server running at http://localhost:8000/')
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待续。。。
