 
$(document).ready(function(){

    /* ----- 侧边悬浮 ---- */
    $(document).on("mouseenter", ".suspension .a", function(){
        var _this = $(this);
        var s = $(".suspension");
        var isService = _this.hasClass("a-service");
        var isServicePhone = _this.hasClass("a-service-phone");
        var isQrcode = _this.hasClass("a-qrcode");
        if(isService){ s.find(".d-service").show().siblings(".d").hide();}
        if(isServicePhone){ s.find(".d-service-phone").show().siblings(".d").hide();}
        if(isQrcode){ s.find(".d-qrcode").show().siblings(".d").hide();}
    });
    $(document).on("mouseleave", ".suspension, .suspension .a-top", function(){
        $(".suspension").find(".d").hide();
    });
    $(document).on("mouseenter", ".suspension .a-top", function(){
        $(".suspension").find(".d").hide(); 
    });
    $(document).on("click", ".suspension .a-top", function(){
        $("html,body").animate({scrollTop: 0});
    });
    $(window).scroll(function(){
        var st = $(document).scrollTop();
        var $top = $(".suspension .a-top");
        if(st > 400){
            $top.css({display: 'block'});
        }else{
            if ($top.is(":visible")) {
                $top.hide();
            }
        }
    });
    
}); 
 