jQuery 复制表单 Bug 及修复

(function(original) {
  jQuery.fn.clone = function() {
    var result = original.apply(this, arguments),
      my_textareas = this.find('textarea').add(this.filter('textarea')),
      result_textareas = result.find('textarea').add(result.filter('textarea')),
      my_selects = this.find('select').add(this.filter('select')),
      result_selects = result.find('select').add(result.filter('select'));
    for (var i = 0, l = my_textareas.length; i < l; ++i) $(result_textareas[i]).val($(my_textareas[i]).val());
    for (var i = 0, l = my_selects.length; i < l; ++i) {
      for (var j = 0, m = my_selects[i].options.length; j < m; ++j) {
        if (my_selects[i].options[j].selected === true) {
          result_selects[i].options[j].selected = true;
        }
      }
    }
    return result;
  };
})(jQuery.fn.clone);

$.fn.cloneForm = function() {
  var $form = $(this);
  var $clonedForm = $form.clone();
  var $missingClonedInput = $clonedForm.find('textarea,select');
  $form.find('textarea,select').each(function(index) {
    $missingClonedInput.eq(index).val($(this).val());
  });
  return $clonedForm;
}