$(function() {
          //TAP
          $('ul.yun-solution-list li').mousemove(function() {
            var index = $(this).index();
            $('ul.yun-solution-wrap li').removeClass('current').eq(index).addClass('current');
            $('#yun-arrow-wrap').attr('class', 'yun-arrow-wrap yun-arrow-current' + (index + 1));
          })
          //背景变换
          $('ul.yun-solution-list li').hover(function() {
            var that = $(this);
            var i = 0;
            bgChange = setInterval(function() {
              i += -84
              that.find('div').css('backgroundPositionY', i)
              if (i <= -2058) {
                clearInterval(bgChange);
              }
            }, 50)
          }, function() {
            clearInterval(bgChange);
          })
        })