(function () {


  // 底部nav
  
    var footernavitem = $(".footer_nav_item");
  footernavitem.hover(
    function () {
      var _this = $(this);
      _this.children(".footer_nav_content").css({
        height: "140px",
        transition: "all .3s ease-in-out",
      });
    },
    function () {
      var _this = $(this);
      _this.children(".footer_nav_content").css({
        height: "0",
      });
    }
  );

})();