JavaScript 胸罩尺寸计算器

只在周末放松一下 ;)

Ed Spencer 已经用JavaScript编了一个胸罩尺寸计算器 :

    近来我为一个更具诱惑性网站中的一个工作，这家网站是专卖女性内衣的。 除了不得不一整天去看只穿内衣的女人的图片这个不值得羡慕的任务之外，我还被迫（强迫！）去写一个胸罩尺寸计算器。

    胸罩尺寸计算器背后的理论是有点神秘和神奇了。 让一个男人或野兽理解它并不容易，所以它是幸运的，我完全不属于那两类， 我通过了痛苦和折磨的考验节省了您的麻烦。

var BraCalculator = {
  
  /**
   * The string to be returned when the result could not be calculated.  Overwrite to change this
   */
  unknownString: "Unknown",
  
  cupSizes: ["A", "B", "C", "D", "DD", "E", "EE", "F", "FF", "G", "GG", "H", "HH", 
             "J", "JJ", "K", "KK", "L", "LL", "M", "MM", "N", "NN"],
  
  /**
   * Returns the correct bra size for given under bust and over bust measurements
   * @param {Number} underBust The measurement taken under the bust (in inches)
   * @param {Number} overBust The measurement taken over the bust (in inches)
   * @return {String} The correct bra size for the given measurements (e.g. 32C, 40DD, etc)
   */
  calculateSize: function(underBust, overBust) {
    var bandSize = this.calculateBandSize(underBust);
    var cupSize  = this.calculateCupSize(bandSize, overBust);
    
    if (bandSize && cupSize) {
      return bandSize + cupSize;
    } else {
      return this.unknownString;
    };
  },
  
  /**
   * Calculates the correct band size for a given under bust measurement
   * @param {Number} underBust The measurement under the bust
   * @return {Number} The correct band size
   */
  calculateBandSize: function(underBust) {
    var underBust = parseInt(underBust, 10);
    return underBust + (underBust % 2) + 2;
  },
  
  /**
   * Calculates the Cup size required given the band size and the over bust measurement
   * @param {Number} bandSize The measured band size (should be an even number)
   * @param {Number} overBust The measurement taken over the bust
   * @return {String} The appropriate alphabetical cup size
   */
  calculateCupSize: function(bandSize, overBust) {
    var bandSize = parseInt(bandSize, 10);
    var overBust = parseInt(overBust, 10);
    var diff     = overBust - bandSize;
    
    var result   = this.cupSizes[diff];
    
    //return false if we couldn't lookup a cup size
    return result ? result : false;
  }
};

And to apply it to your own pages, use something a bit like this:

jQuery(document).ready(function(){
  //add listeners to band and cup measurement text boxes
  jQuery('#back').keyup(Honeys.updateBraSizeCalculation);
  jQuery('#cup').keyup(Honeys.updateBraSizeCalculation);
});

var Honeys = {
  updateBraSizeCalculation: function() {
    var back = jQuery('#back')[0].value;
    var cup  = jQuery('#cup')[0].value;
    
    if (back.length > 0 && cup.length > 0) {
      jQuery('#fit')[0].value = BraCalculator.calculateSize(back, cup);
    };
  }
};