本文实例讲述了Node.js多页面实现的数学运算。分享给大家供大家参考，具体如下：
app-node.js
rush:js;">
var http_port = 3000;
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(404,{'Content-Type': 'text/plain'});
res.end("bad URL" + req.url);
}
});
server.listen(http_port);
console.log('listening to http://localhost:3000');
htutil.js
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var url = require('url');
exports.loadParams = function(req,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 [""].join('\n');
}
exports.page = function(title,navbar,content){
return ["{title} ",""
].join('\n')
.replace(new RegExp("{title}","gm"),title)
.replace("{navbar}",navbar)
.replace("{content}",content);
}
{title}
","home-node.js
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var htutil = require('./htutil');
exports.get = function(req,res){
res.writeHead(200,{'Content-Type': 'text/html'});
res.end(htutil.page("Math Wizard",htutil.navbar(),"
Math Wizard
")); }square-node.js
rush:js;">
var htutil = require('./htutil');
exports.get = function(req,{'Content-Type': 'text/html'});
var result = req.a * req.a;
res.end(
htutil.page("Square",[
(!isNaN(req.a) ?
("
{a} squared = {sq}
" .replace("{a}",req.a) .replace("{sq}",req.a * req.a)) : ""),"Enter numbers to see its square
","" ].join('\n')) ); }factorial-node.js
rush:js;">
var htutil = require('./htutil');
var math = require('./math');
exports.get = function(req,{'Content-Type': 'text/html'});
res.end(
htutil.page("Factorial",[
(!isNaN(req.a) ?
("
{a} factorial = {fact}
" .replace("{a}",req.a) .replace("{fact}",math.factorial(Math.floor(req.a)))) : ""),"Enter numbers to see its factorial
","" ].join('\n')) ); }mult-node.js
rush:js;">
var htutil = require('./htutil');
exports.get = function(req,{'Content-Type': 'text/html'});
var result = req.a * req.b;
res.end(
htutil.page("Multiplication",[
(!isNaN(req.a) && !isNaN(req.b) ?
("
{a} * {b} = {result}
" .replace("{a}",req.a) .replace("{b}",req.b) .replace("{result}",req.a * req.b)) : ""),"Enter numbers to mutiply
","" ].join('\n')) ); }fibo-node.js
rush:js;">
var htutil = require('./htutil');
var math = require('./math');
exports.get = function(req,{'Content-Type': 'text/html'});
res.end(
htutil.page("Fibonacci",[
(!isNaN(req.a) ?
("
{a} fibonacci = {fibo}
" .replace("{a}",Math.floor(req.a)) .replace("{fibo}",math.fibonacci(Math.floor(req.a)))) : ""),"Enter numbers to see its fibonacci
","" ].join('\n')) ); }fibo2-node.js
rush:js;">
var htutil = require('./htutil');
var math = require('./math');
function sendResult(req,a,fiboval){
res.writeHead(200,[
(!isNaN(fiboval) ?
("
{a} fibonacci = {fibo}
" .replace("{a}",a) .replace("{fibo}",fiboval)) : ""),"" ].join('\n')) ); } exports.get = function(req,res){ if (!isNaN(req.a)){ math.fibonacciAsync(Math.floor(req.a),function(val){ sendResult(req,Math.floor(req.a),val); }); }else { sendResult(req,NaN,NaN); } }math.js
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var factorial = exports.factorial = function(n){
if (n == 0)
return 1;
else
return n * factorial(n-1);
}
var fibonacci = exports.fibonacci = function(n){
if (n === 1)
return 1;
else if (n === 2)
return 1;
else
return fibonacci(n-1) + fibonacci(n-2);
}
var fibonacciAsync = exports.fibonacciAsync = function(n,done){
if (n ==1 || n == 2)
done(1);
else {
process.nextTick(function(){
fibonacciAsync(n-1,function(val1){
process.nextTick(function(){
fibonacciAsync(n-2,function(val2){
done(val1 + val2);
});
})
});
});
}
}
希望本文所述对大家nodejs程序设计有所帮助。