jquery clone方法bug修复

$("iframe").find("input").each(function(){ 
    $("#formHidden").append($(this).clone()); 
}); 
$("iframe").find("select").each(function(){ 
    $("#formHidden").append($(this).clone()); 
}); 
$("iframe").find("textarea").each(function(){ 
    $("#formHidden").append($(this).clone()); 
}); 

// Textarea and select clone() bug workaround | Spencer Tipping 
// Licensed under the terms of the MIT source code license 
 
// Motivation. 
// jQuery's clone() method works in most cases, but it fails to copy the value of textareas and select elements. This patch replaces jQuery's clone() method with a wrapper that fills in the 
// values after the fact. 
 
// An interesting error case submitted by Piotr Przyby?: If two <select> options had the same value, the clone() method would select the wrong one in the cloned box. The fix, suggested by Piotr 
// and implemented here, is to use the selectedIndex property on the <select> box itself rather than relying on jQuery's value-based val(). 
 
(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) result_selects[i].selectedIndex = my_selects[i].selectedIndex; 
 
    return result; 
  }; 
}) (jQuery.fn.clone);