JavaScript探测CSS动画是否已经完成的方法

WN:(function(){
      var el = $(''),
        transition="transition",
        transitionEnd,
        animEvent={'start':null,'iteration':null,'end':null},
        vendorPrefix;
        
      transition = transition.charAt(0).toUpperCase() + transition.substr(1);
      
      vendorPrefix=(function(){//现在的opera也是webkit
        var i=0, vendor=["Moz", "Webkit", "Khtml", "O", "ms"];
        while (i