jQuery右下角旋转环状菜单特效实现

<div class="htmleaf-container">
 <div id='ss_menu'>
  <div>
  <i class="fa fa-qq"></i>
  </div>
  <div>
  <i class="fa fa-weibo"></i>
  </div>
  <div>
  <i class="fa fa-weixin"></i>
  </div>
  <div>
  <i class="fa fa-renren"></i>
  </div>
  <div class='menu'>
  <div class='share' id='ss_toggle' data-rot=''>
   <div class='circle'></div>
   <div class='bar'></div>
  </div>
  </div>
 </div>
</div>

$(document).ready(function (ev) {
 var toggle = $('#ss_toggle');
 var menu = $('#ss_menu');
 var rot;
 $('#ss_toggle').on('click', function (ev) {
  rot = parseInt($(this).data('rot')) - 180;
  menu.css('transform', 'rotate(' + rot + 'deg)');
  menu.css('webkitTransform', 'rotate(' + rot + 'deg)');
  if (rot / 180 % 2 == 0) {
   toggle.parent().addClass('ss_active');
   toggle.addClass('close');
  } else {
   toggle.parent().removeClass('ss_active');
   toggle.removeClass('close');
  }
  $(this).data('rot', rot);
 });
 menu.on('transitionend webkitTransitionEnd oTransitionEnd', function () {
  if (rot / 180 % 2 == 0) {
   $('#ss_menu div i').addClass('ss_animate');
  } else {
   $('#ss_menu div i').removeClass('ss_animate');
  }
 });
});