从零开始学习Node.js系列教程四：多页面实现的数学运算示例

res.writeHead(200, {'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(200, {'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(200, {'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(200, {'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))))								 
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