gistfile1.js

/**

例如 prezero(200)  返回 0200

*/
var prezero = function(number) {
  var str = number.toString(10);
  var len = str.length;
  while((len++) < 4) {
    str = '0' + str;
  }
  return str;
}



/**

var myrange = range(0, 3000);

myrange(
  100, 
  function(num){
    alert('ok')
  }, 
  function(num){
    alert('fail');
  }
)

*/	
var range = function(from, to) {
  return function(number, pass, fail) {
  number = parseInt(number, 10);
  if ( /\d/.test(number) && number >=from && number <=to) {
    pass(prezero(number))
  } else {
    fail(number);
  }
}