
<!-- 导航特效 -->
 $(document).ready(function() {
  // Cache selectors for faster performance.
          var $window = $(window),
              $mainMenuBar = $('#mainMenuBar'),
             $mainMenuBarAnchor = $('#mainMenuBarAnchor');
       
         // Run this on scroll events.
         //scroll()
       //当用户滚动指定的元素时，会发生scroll事件。
       //scroll事件适用于所有可滚动的元素和window对象（浏览器窗口）
      //scroll()方法触发scroll事件，或规定当发生scroll事件时运行的函数
          $window.scroll(function() {
             //scrollTop()方法返回或设置匹配元素的滚动条的垂直位置
           var window_top = $window.scrollTop();
           //javascript用offsetTop();jquery用offset().top;
            var div_top = $mainMenuBarAnchor.offset().top;
             if (window_top > div_top) {
                // Make the div sticky.
               $mainMenuBar.addClass('stick');
               $mainMenuBarAnchor.height($mainMenuBar.height());
              }
              else {
              // Unstick the div.
              $mainMenuBar.removeClass('stick');
            $mainMenuBarAnchor.height(0);
          }
   });
       });




<!-- 悬浮客服结束 -->

$(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();
			}
		}
	});
	
});