js代码

<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
$(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();
			}
		}
	});
	
});	
</script>