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

: ""),
"<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(200, {'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 == 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。