錨點相信大傢都使用過吧！點擊後僵硬的切換是不是很不爽呢？
下面分享一個小技巧，根據錨點offset值來實現動畫切換
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="https://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>無標題文檔</title>
<script type="text/javascript" src="js/jquery-1.8.3.min.js"></script>
<style>
*{ margin:0; padding:0;}
.main{ width:1000px; margin:0 auto; position:relative; }
.main img{ float:left;}
.bg{ position:absolute; width:100%; z-index:-5;}
.bg01{ height:885px;background:url(../images/b_01.jpg) no-repeat center;}
.bg02{ height:938px;background:url(../images/b_04.jpg) no-repeat center; }
.bg03{ height:946px;background:url(../images/b_02.jpg) no-repeat center; }
.bg04{ height:946px;background:url(../images/b_03.jpg) no-repeat center; }
.p_scoll{ position:fixed; width:50px; height:200px; right:100px; top:50%;}
a{ display:block; background:#3F6; color:#000; width:50px; height:50px; }
</style>
</head>
<body>
<p class="wrapper">
<p class="main">
<p id="tab_01" class="tab"><img src="images/m_01.jpg" alt="" /></p>
<p id="tab_02" class="tab"><img src="images/m_04.jpg" alt="" /></p>
<p id="tab_03" class="tab"><img src="images/m_02.jpg" alt="" /></p>
<p id="tab_04" class="tab"><img src="images/m_03.jpg" alt="" /></p>
</p>
<p class="bg">
<p class="bg01" id="bg01"></p>
<p class="bg02" id="bg02"></p>
<p class="bg03" id="bg03"></p>
<p class="bg04" id="bg04"></p>
</p>
</p>
<p class="p_scoll">
<a href="#bg01">圖1</a>
<a href="#bg02">圖2</a>
<a href="#bg03">圖3</a>
<a href="#bg04">圖4</a>
</p>
<script>
$(function(){
$(".p_scoll a").click(function(){
$("html,body").animate({ scrollTop:$($(this).attr("href")).offset().top + "px"},1000);
});
});
</script>
</body>
</html>