jQuery实现自定义checkbox和radio样式

<form class="form" method="post">
  <fieldset>
    <legend>Which genres do you like?</legend>
    <input type="checkbox" value="action" id="check-1" name="genre"><label for="check-1" class="">Action / Adventure</label>
    <input type="checkbox" value="comedy" id="check-2" name="genre"><label for="check-2" class="">Comedy</label>
    <input type="checkbox" value="epic" id="check-3" name="genre"><label for="check-3" class="">Epic / Historical</label>
    <input type="checkbox" value="science" id="check-4" name="genre"><label for="check-4" class="">Science Fiction</label>
    <input type="checkbox" value="romance" id="check-5" name="genre"><label for="check-5" class="">Romance</label>
    <input type="checkbox" value="western" id="check-6" name="genre"><label for="check-6" class="">Western</label>
  </fieldset> 
  <fieldset>
    <legend>Caddyshack is the greatest movie of all time, right?</legend>
    <input type="radio" value="1" id="radio-1" name="opinions"><label for="radio-1" class="">Totally</label>
    <input type="radio" value="1" id="radio-2" name="opinions"><label for="radio-2" class="">You must be kidding</label>
    <input type="radio" value="1" id="radio-3" name="opinions"><label for="radio-3" class="">What's Caddyshack?</label>
  </fieldset>
</form>

jQuery.fn.customInput = function(){
  $(this).each(function(i){
    if($(this).is('[type=checkbox],[type=radio]')){
      var input = $(this);
      //get the associated label using the input's id
      var label = $('label[for='+input.attr('id')+']');
      //get type,for classname suffix
      var inputType = (input.is('[type=checkbox]')) ? 'checkbox' : 'radio';
      //wrap the input + label in a div
      $('<div class="custom-'+ inputType +'"></div>').insertBefore(input).append(input,label);
      //find all inputs in this set using the shared name attribute
      var allInputs = $('input[name='+input.attr('name')+']');
      //necessary for browsers that don't support the :hover pseudo class on labels
      label.hover(function(){
        $(this).addClass('hover');
        if(inputType == 'checkbox' && input.is(':checked')) {
          $(this).addClass('checkedHover');
        }
      },function(){
        $(this).removeClass('hover checkedHover');
      });
       
      //bind custom event, trigger it, bind click,focus,blur events
      input.bind('updateState',function(){
        if(input.is(':checked')){
          if(input.is(':radio')){
            allInputs.each(function(){
              $('label[for='+$(this).attr('id')+']').removeClass('checked');
            });
          };
          label.addClass('checked');
        } else {
          label.removeClass('checked checkedHover checkedFocus');
        }
      })
      .trigger('updateState')
      .click(function(){
        $(this).trigger('updateState');
      })
      .focus(function(){
        label.addClass('focus');
        if(inputType == 'checkbox' && input.is(':checked')) {
          $(this).addClass('checkedFocus');
        }
      })
      .blur(function(){
        label.removeClass('focus checkedFocus');
      });        
    }
  });
}

$('input').customInput();

/* wrapper divs */
      .custom-checkbox,
      .custom-radio {
        position: relative;
        display: inline-block;
      }
      /* input, label positioning */
      .custom-checkbox input,
      .custom-radio input {
        position: absolute;
        left: 2px;
        top: 3px;
        margin: 0;
        z-index: -1;
      }
      .custom-checkbox label,
      .custom-radio label {
        display: block;
        position: relative;
        z-index: 1;
        font-size: 1.3em;
        padding-right: 1em;
        line-height: 1;
        padding: .5em 0 .5em 30px;
        margin: 0 0 .3em;
        cursor: pointer;
      }

/* ==默认状态效果== */
      .custom-checkbox label { 
        background: url(images/checkbox.gif) no-repeat; 
      }
      .custom-radio label { 
        background: url(images/button-radio.png) no-repeat; 
      }
      .custom-checkbox label, 
      .custom-radio label {
        background-position: 0px 0px;
      }

/*==鼠标悬停和得到焦点状态==*/
      .custom-checkbox label.hover,
      .custom-checkbox label.focus,
      .custom-radio label.hover,
      .custom-radio label.focus {
        /*background-position: -10px -114px;*/
      }
      
      /*==选中状态==*/
      .custom-checkbox label.checked,
      .custom-radio label.checked {
        background-position: 0px -47px;
      }
      .custom-checkbox label.checkedHover,
      .custom-checkbox label.checkedFocus {
        /*background-position: -10px -314px;*/
      }
      .custom-checkbox label.focus,
      .custom-radio label.focus {
        outline: 1px dotted #ccc;
      }