代码结构

1. 引入CSS

<link rel="stylesheet" type="text/css" href="css/base.css" />
<link rel="stylesheet" type="text/css" href="css/style.css" />

2. 引入JS

<script src="js/jquery-1.7.2.min.js" type="text/javascript"></script>
<script src="js/sectionscroll.js" type="text/javascript"></script>
<script src="js/jquery.mousewheel.min.js" type="text/javascript"></script>

3. HTML代码

<!-- container -->
<section id="section1" class="section section1">
	<article class="sectionWrapper section1Wrapper fadeInDown">
		<div class="sectionTitle">
			<h1 class="txthide">域名3.0</h1>
			<div class="txthide">
				<span></span>
				<span>易名中国手机客户端</span>
			</div>
			<div id="gem-back"><a class="gem-back" href="http://www.17sucai.com/"></a></div>
			<h2><img src="images/text_01.png" width="260" alt="易名3.0" ></h2>
			<div class="iph_dload"><a href="http://www.17sucai.com/"><img src="images/iphone_dload.png" width="260px" height="85px" alt="ipone下载"></a></div>
			<div class="andr_dload"><a href="http://www.17sucai.com/"><img src="images/android_dload.png" width="260px" height="85px" alt="安卓下载"></a></div>
		</div>
		<div class="secitonbottombg"><img src="images/fir_bg.jpg" width="1622px" class="imgpng"/></div>
		<div class="arrow_down"><a href="#section2"><img src="images/arrow_down.png" width="42px" height="24px" alt="arrow_down"></a> </div>
	</article>
</section>
<section id="section2" class="section section2">
	<article class="sectionWrapper section2Wrapper">
		<div class="secitonbottombg"><img src="images/sec_bg.jpg"  width="1000"  akt="购买域名"/></div>
		<div class="arrow_down"><a href="#section3"> <img src="images/arrow_down.png" width="42px" height="24px" alt="arrow_down"></a></div>
	</article>
</section>
<section id="section3" class="section section3">
	<article class="sectionWrapper section3Wrapper">
		<div class="secitonbottombg"><img src="images/thi_bg.jpg"  width="1128" alt="域名交流"/></div>
		<div class="arrow_down"><a href="#section4"> <img src="images/arrow_down.png" width="42px" height="24px" alt="arrow_down"></a></div>
	</article>
</section>
<section id="section4" class="section section4">
	<article class="sectionWrapper section4Wrapper">
		<div class="secitonbottombg"><img src="images/fou_bg.jpg"  width="1128" alt="域名查询注册"/></div>
		<div class="arrow_down"><a href="#section5"> <img src="images/arrow_down.png" width="42px" height="24px" alt="arrow_down"></a></div>
	</article>
</section>
<section id="section5" class="section section5">
	<article class="sectionWrapper section5Wrapper">
		<div class="secitonbottombg"><img src="images/fif_bg.jpg"  width="668" alt="域名管理"/></div>
		<div class="arrow_down"><a href="#section6"> <img src="images/arrow_down.png" width="42px" height="24px" alt="arrow_down"></a></div>
	</article>
</section>
<section id="section6" class="section section6">
	<article class="sectionWrapper section6Wrapper">
		<div class="secitonbottombg">
			<img src="images/six_bg.jpg"  width="668" alt="新闻资讯"/>
			<a href="#" > <img src="images/download.jpg" width="300px" height="105px" alt="立即下载"></a>
		</div>
	</article>
</section>
<!--回到顶部-->
<div id="arrow_up"><a href="#" ><img src="images/slide_up.png" width="90px" height="90px" alt="回到顶部" ></a></div>
<script type="text/javascript">
var h=window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
$(window).scroll(function(){
	var Yoffset=window.pageYOffset || document.documentElement.scrollTop;
	if (Yoffset> 2* h) {  
		$("#arrow_up").fadeIn(100);
	}else{
		$("#arrow_up").fadeOut(100);
	};
});
$("#arrow_up").bind("click",function(e){
	e.preventDefault();
	$("body").animate({"scrollTop":"0"},1000);
});
</script>  
<script src="js/sectionscroll.js" type="text/javascript"></script>