从零开始学习Node.js例子四 多页面实现数学运算
app-node.js
var http_port = ;
var http = require('http');
var htutil = require('./htutil');
var server = http.createServer(function(req, res){
htutil.loadParams(req, res, undefined);
if (req.requrl.pathname === '/'){
require('./home-node').get(req, res);
}else if (req.requrl.pathname === '/square'){
require('./square-node').get(req, res);
}else if (req.requrl.pathname === '/factorial'){
require('./factorial-node').get(req, res);
}else if (req.requrl.pathname === '/fibonacci'){
require('./fibo-node').get(req, res);
}else if (req.requrl.pathname === '/mult'){
require('./mult-node').get(req, res);
}else{
res.writeHead(, {'Content-Type': 'text/plain'});
res.end("bad URL" + req.url);
}
});
server.listen(http_port);
console.log('listening to http://localhost:3000');
htutil.js
var url = require('url');
exports.loadParams = function(req, res, next){
req.requrl = url.parse(req.url, true);
req.a = (req.requrl.query.a && !isNaN(req.requrl.query.a))
? new Number(req.requrl.query.a)
: NaN;
req.b = (req.requrl.query.b && !isNaN(req.requrl.query.b))
? new Number(req.requrl.query.b)
: NaN;
if(next) next();
}
exports.navbar = function(){
return ["<div class='navbar'>",
"<p><a href='/'>home</a></p>",
"<p><a href='/mult'>Multiplication</a></p>",
"<p><a href='/square'>Square</a></p>",
"<p><a href='/factorial'>Factorial</a></p>",
"<p><a href='/fibonacci'>Fibonacci</a></p>",
"</div>"].join('\n');
}
exports.page = function(title, navbar, content){
return ["<html><head><title>{title}</title></head>",
"<body><h1>{title}</h1>",
"<table><tr>",
"<td>{navbar}</td><td>{content}</td>",
"</tr></table></body></html>"
].join('\n')
.replace(new RegExp("{title}", "gm"), title)
.replace("{navbar}", navbar)
.replace("{content}", content);
}
home-node.js
var htutil = require('./htutil');
exports.get = function(req, res){
res.writeHead(, {'Content-Type': 'text/html'});
res.end(htutil.page("Math Wizard", htutil.navbar(), "<p>Math Wizard</p>"));
}
square-node.js
var htutil = require('./htutil');
exports.get = function(req, res){
res.writeHead(, {'Content-Type': 'text/html'});
var result = req.a * req.a;
res.end(
htutil.page("Square", htutil.navbar(), [
(!isNaN(req.a) ?
("<p class='result'>{a} squared = {sq}</p>"
.replace("{a}", req.a)
.replace("{sq}", req.a * req.a))
: ""),
"<p>Enter numbers to see its square</p>",
"<form name='square' action='/square' method='get'>",
"A: <input type='text' name='a' /><br/>",
"<input type='submit' value='Submit' />",
"</form>"
].join('\n'))
);
}
factorial-node.js
var htutil = require('./htutil');
var math = require('./math');
exports.get = function(req, res){
res.writeHead(, {'Content-Type': 'text/html'});
res.end(
htutil.page("Factorial", htutil.navbar(), [
(!isNaN(req.a) ?
("<p class='result'>{a} factorial = {fact}</p>"
.replace("{a}", req.a)
.replace("{fact}", math.factorial(Math.floor(req.a))))
: ""),
"<p>Enter numbers to see its factorial</p>",
"<form name='factorial' action='/factorial' method='get'>",
"A: <input type='text' name='a' /><br/>",
"<input type='submit' value='Submit' />",
"</form>"
].join('\n'))
);
}
mult-node.js
var htutil = require('./htutil');
exports.get = function(req, res){
res.writeHead(, {'Content-Type': 'text/html'});
var result = req.a * req.b;
res.end(
htutil.page("Multiplication", htutil.navbar(), [
(!isNaN(req.a) && !isNaN(req.b) ?
("<p class='result'>{a} * {b} = {result}</p>"
.replace("{a}", req.a)
.replace("{b}", req.b)
.replace("{result}", req.a * req.b))
: ""),
"<p>Enter numbers to mutiply</p>",
"<form name='mult' action='/mult' method='get'>",
"A: <input type='text' name='a' /><br/>",
"B: <input type='text' name='b' /><br/>",
"<input type='submit' value='Submit' />",
"</form>"
].join('\n'))
);
}
fibo-node.js
var htutil = require('./htutil');
var math = require('./math');
exports.get = function(req, res){
res.writeHead(, {'Content-Type': 'text/html'});
res.end(
htutil.page("Fibonacci", htutil.navbar(), [
(!isNaN(req.a) ?
("<p class='result'>{a} fibonacci = {fibo}</p>"
.replace("{a}", Math.floor(req.a))
.replace("{fibo}", math.fibonacci(Math.floor(req.a))))
: ""),
"<p>Enter numbers to see its fibonacci</p>",
"<form name='fibonacci' action='/fibonacci' method='get'>",
"A: <input type='text' name='a' /><br/>",
"<input type='submit' value='Submit' />",
"</form>"
].join('\n'))
);
}
fibo2-node.js
var htutil = require('./htutil');
var math = require('./math');
function sendResult(req, res, a, fiboval){
res.writeHead(, {'Content-Type': 'text/html'});
res.end(
htutil.page("Fibonacci", htutil.navbar(), [
(!isNaN(fiboval) ?
("<p class='result'>{a} fibonacci = {fibo}</p>"
.replace("{a}", a)
.replace("{fibo}", fiboval))
: ""),
"<p>Enter numbers to see its fibonacci</p>",
"<form name='fibonacci' action='/fibonacci' method='get'>",
"A: <input type='text' name='a' /><br/>",
"<input type='submit' value='Submit' />",
"</form>"
].join('\n'))
);
}
exports.get = function(req, res){
if (!isNaN(req.a)){
math.fibonacciAsync(Math.floor(req.a), function(val){
sendResult(req, res, Math.floor(req.a) ,val);
});
}else {
sendResult(req, res, NaN, NaN);
}
}
math.js
var factorial = exports.factorial = function(n){
if (n == )
return ;
else
return n * factorial(n-);
}
var fibonacci = exports.fibonacci = function(n){
if (n === )
return ;
else if (n === )
return ;
else
return fibonacci(n-) + fibonacci(n-);
}
var fibonacciAsync = exports.fibonacciAsync = function(n, done){
if (n == || n == )
done();
else {
process.nextTick(function(){
fibonacciAsync(n-, function(val1){
process.nextTick(function(){
fibonacciAsync(n-, function(val2){
done(val1 + val2);
});
})
});
});
}
}
从零开始学习Node.js例子四 多页面实现数学运算的更多相关文章
- 从零开始学习Node.js例子四 多页面实现数学运算 续二(client端和server端)
1.server端 支持数学运算的服务器,服务器的返回结果用json对象表示. math-server.js //通过监听3000端口使其作为Math Wizard的后台程序 var math = r ...
- 从零开始学习Node.js例子四 多页面实现数学运算 续一(使用connect和express框架)
1.使用connect框架 .use方法用于绑定中间件到connect服务器,它会配置一系列在接到请求时调用的中间件模块,此例中我们要配置的中间件有favicon logger static rout ...
- 从零开始学习Node.js例子三 图片上传和显示
index.js var server = require("./server"); var router = require("./router"); var ...
- 从零开始学习Node.js例子一 http get和post
httpserverrequestget.js /* 获取GET请求内容 由于GET请求直接被嵌入在路径中,URL是完整的请求路径,包括了?后面的部分,因此你可以手动解析后面的内容作为GET请求的参数 ...
- 从零开始学习Node.js例子八 使用SQLite3和MongoDB
setup.js:初始化数据库 var util = require('util'); var async = require('async'); //npm install async var no ...
- 从零开始学习Node.js例子七 发送HTTP客户端请求并显示响应结果
wget.js:发送HTTP客户端请求并显示响应的各种结果 options对象描述了将要发出的请求.data事件在数据到达时被触发,error事件在发生错误时被触发.HTTP请求中的数据格式通过MIM ...
- 从零开始学习Node.js例子六 EventEmitter发送和接收事件
pulser.js /* EventEmitter发送和接收事件 HTTPServer和HTTPClient类,它们都继承自EventEmitter EventEmitter被定义在Node的事件(e ...
- 从零开始学习Node.js例子九 设置HTTP头
server.js //basic server的配置文件 ; var server = require('./basicserver').createServer(); server.useFavI ...
- 从零开始学习Node.js例子五 服务器监听
httpsnifferInvoke.js var http = require('http'); var sniffer = require('./httpsniffer'); var server ...
随机推荐
- JAVA基础知识之JDBC——使用ResultSetMetaData分析结果集
通过ResultSetMetaData可以对ResultSet进行分析,获取ResultSet里包含了哪些数据列,以及每个列的数据类型. ResultSet中包含了一个getMetaData()方法, ...
- “stdafx.h”: No such file or directory
“stdafx.h”: No such file or directory 一般原因是建工程的时候选择了空工程,然后添加现有源文件(含stdafx.cpp) 或者 修改了已有的stdafx.cpp 或 ...
- [四校联考P3] 区间颜色众数 (主席树)
主席树 Description 给定一个长度为 N 颜色序列A,有M个询问:每次询问一个区间里是否有一种颜色的数量超过了区间的一半,并指出是哪种颜色. Input 输入文件第一行有两个整数:N和C 输 ...
- simplexml_load_file 抑制警告的直接输出
$xml = simlexml_load_file($file, null, LIBXML_NOERROR); if (!is_object($this->xml)){ throw new Ex ...
- Mysql新知识点150928
1.select distinct(DATE_FORMAT(updatetime,'%Y-%m')) as updatetime from barcode where pid!=0 order by ...
- <转>修改TM2013聊天记录保存目录final版
一直很钟意TM的清爽,然而在升级到TM2013 preview1后,发生了一件很让人头痛的事. 那就是无法设定消息目录,TM会默认为保存在我的文档下.这让使用dropbox同步聊天记录的我感到十 ...
- 剑指offer二：替换空格
题目描述: 请实现一个函数,将一个字符串中的空格替换成"%20".例如,当字符串为We Are Happy.则经过替换之后的字符串为We%20Are%20Happy. 解题思路: ...
- php: 学习记录
1.get_object_vars($obj) 获取对象$obj的属性数组 2.类和对象 <?php // 类和对象 echo "类和对象" . "\n" ...
- Pycharm使用问题# 行号设置
设置行号就很简单了,在Settings中找到Editor-Appearance,选中Show line numbers即可.
- AVKit & MediaPlayer简写
@import AVKit; @import AVFoundation; NSString *address = [[NSBundle mainBundle]pathForResource:@&quo ...