(function(){

​

  /**

   * Decimal adjustment of a number.

   *

   * @param {String}  type  The type of adjustment.

   * @param {Number}  value The number.

   * @param {Integer} exp   The exponent (the 10 logarithm of the adjustment base).

   * @returns {Number}      The adjusted value.

   */

  function decimalAdjust(type, value, exp) {

    // If the exp is undefined or zero...

    if (typeof exp === 'undefined' || +exp === 0) {

      return Math[type](value);

    }

    value = +value;

    exp = +exp;

    // If the value is not a number or the exp is not an integer...

    if (isNaN(value) || !(typeof exp === 'number' && exp % 1 === 0)) {

      return NaN;

    }

    // Shift

    value = value.toString().split('e');

    value = Math[type](+(value[0] + 'e' + (value[1] ? (+value[1] - exp) : -exp)));

    // Shift back

    value = value.toString().split('e');

    return +(value[0] + 'e' + (value[1] ? (+value[1] + exp) : exp));

  }

​

  // Decimal round

  if (!Math.round10) {

    Math.round10 = function(value, exp) {

      return decimalAdjust('round', value, exp);

    };

  }

  // Decimal floor

  if (!Math.floor10) {

    Math.floor10 = function(value, exp) {

      return decimalAdjust('floor', value, exp);

    };

  }

  // Decimal ceil

  if (!Math.ceil10) {

    Math.ceil10 = function(value, exp) {

      return decimalAdjust('ceil', value, exp);

    };

  }

    Number.prototype.toFixedB = function toFixed ( precision ) {

        var multiplier = Math.pow( 10, precision + 1 ),

            wholeNumber = Math.floor( this * multiplier );

        return (Math.round( wholeNumber / 10 ) * 10 / multiplier).toFixed(precision);

    }

    Number.prototype.toFixed10 = function(precision) {

        return Math.round10(this, -precision).toFixed(precision);

    }

​

})();

​

$(function() {

  $('#in').change(function() {            

    $('#toFixed > span').text(parseFloat($(this).val()).toFixed(2));

    $('#toFixedB > span').text(parseFloat($(this).val()).toFixedB(2));

    $('#toFixed10 > span').text(parseFloat($(this).val()).toFixed10(2));

  });

});