$(document).ready(function () {
     // ��ȡҳ���еĺ�������
     function addaimate(i, divid, addclass) {
         var box = $('.main').children().eq(i);
         var boxtop = document.getelementbyid(divid).offsettop;
         var docheight = $(window).height();
         if (boxtop < docheight) {
             box.addclass(addclass);
         };
         var scroh = $(document).scrolltop();
         if (boxtop - scroh < docheight) {
             box.addclass(addclass);
         };
     };
     // ҳ����� 
     $(document).scroll(function () {
         addaimate(0, "w_fimg-1616135076697", 'animated zoomin infinite');
         addaimate(1, "w_fimg-1616135558867", 'animated fadeindown infinite');
         addaimate(2, "w_fimg-1616135605022", 'animated zoomin infinite');
         addaimate(3, "w_fimg-1616135630407", 'animated fadeinup infinite');
         addaimate(4, "w_grid-1616135987647", 'animated fadeinleft infinite');
         addaimate(5, "w_grid-1616144179339", 'animated fadeinright infinite');
         addaimate(6, "w_grid-1616145430839", 'animated fadeinright infinite');
         addaimate(7, "w_grid-1616145336549", 'animated fadeinright infinite');
        
     });
         addaimate(0, "w_fimg-1616135076697", 'animated zoomin infinite');
         addaimate(1, "w_fimg-1616135558867", 'animated fadeindown infinite');
         addaimate(2, "w_fimg-1616135605022", 'animated zoomin infinite');
         addaimate(3, "w_fimg-1616135630407", 'animated fadeinup infinite');
         addaimate(4, "w_grid-1616135987647", 'animated fadeinleft infinite');
         addaimate(5, "w_grid-1616144179339", 'animated fadeinright infinite');
         addaimate(6, "w_grid-1616145430839", 'animated fadeinright infinite');
         addaimate(7, "w_grid-1616145336549", 'animated fadeinright infinite');
    
 });