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Nodejs乘法平方例子

2012-04-08 14:24 309 查看

此例实现的功能如下图所示

计算结果

代码如下

app-node.js

var http_port = 8124;
var http = require('http');
var htutil = require('./htutil');

function onRequest(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==='/mult')
	{
		require('./mult-node').get(req,res);
	}
	else
	{
		res.writeHead(404,{'Content-Type':'text/plain'});
		res.end("bad URL"+req.url);
	}
	
}

var server = http.createServer(onRequest);
server.listen(http_port);
console.log('listening to http://localhost:8124');

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();
}
//导航条
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's</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("{title}", title,"g")
			.replace("[title]", title,"g")
			.replace("{navbar}", navbar, "g")
			.replace("{content}", content, "g");
}

home-node.js

var htutil = require('./htutil');
exports.get = function(req, res)
{
	res.writeHead(200, {'Content-Type':'text/html'});
	res.end(
				htutil.page("Math Wizard",
							htutil.navbar(),
							"<p>Math Wizard</p>")
			);
}

mult-node.js

var htutil=require('./htutil');
exports.get=function(req, res)
{
res.writeHead(200,{'Content-Type':'text/html'});
var result=req.a*req.b;
var strT="<p class='result'>{a}*{b}={result}</p>";
strT=strT.replace("{a}", req.a);
strT=strT.replace("{b}", req.b);
strT=strT.replace("{result}", result);
var resultStr=(!isNaN(req.a)&&!isNaN(req.b))?strT:"";
res.end(
		htutil.page("Multiplication", htutil.navbar(),
					[resultStr,
					"<p>Enter numbers to multiply</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')
					)
		);
}

square-node.js

var htutil = require('./htutil');
exports.get = function(req, res) {
res.writeHead(200, {
'Content-Type': 'text/html'
});
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 a number to see its square</p>",
"<form name='square' action='/square' method='get'>",
"A: <input type='text' name='a' />",
"</form>"
].join('\n'))
);
}

参考书籍《Node Web Development》

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