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但是錨點也有個問題，通常點擊錨點後，頁面會立即跳到目標位置，而本文介紹的方法，實現了錨點(Anchor)間平滑跳轉，效果非常不錯。複製代碼 代碼如下:<script type="text/javascript">
// 說明 ：用 Javascript 實現錨點(Anchor)間平滑跳轉
// 來源 ：ThickBox 2.1
// 整理 ：Yanfu Xie [xieyanfu@yahoo.com.cn]
// 日期 ：07.01.17
// 轉換為數字
function intval(v)
{
v = parseInt(v);
return isNaN(v) ? 0 : v;
}
// 擷取元素資訊
function getPos(e)
{
var l = 0;
var t = 0;
var w = intval(e.style.width);
var h = intval(e.style.height);
var wb = e.offsetWidth;
var hb = e.offsetHeight;
while (e.offsetParent){
l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
e = e.offsetParent;
}
l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
}
// 擷取捲軸資訊
function getScroll()
{
var t, l, w, h;
if (document.documentElement && document.documentElement.scrollTop) {
t = document.documentElement.scrollTop;
l = document.documentElement.scrollLeft;
w = document.documentElement.scrollWidth;
h = document.documentElement.scrollHeight;
} else if (document.body) {
t = document.body.scrollTop;
l = document.body.scrollLeft;
w = document.body.scrollWidth;
h = document.body.scrollHeight;
}
return { t: t, l: l, w: w, h: h };
}
// 錨點(Anchor)間平滑跳轉
function scroller(el, duration)
{
if(typeof el != 'object') { el = document.getElementById(el); }
if(!el) return;
var z = this;
z.el = el;
z.p = getPos(el);
z.s = getScroll();
z.clear = function(){window.clearInterval(z.timer);z.timer=null};
z.t=(new Date).getTime();
z.step = function(){
var t = (new Date).getTime();
var p = (t - z.t) / duration;
if (t >= duration + z.t) {
z.clear();
window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
} else {
st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
z.scroll(st, sl);
}
};
z.scroll = function (t, l){window.scrollTo(l, t)};
z.timer = window.setInterval(function(){z.step();},13);
}
</script>
調用方式： 複製代碼 代碼如下:scroller(el, duration)
el : 目標錨點 ID
duration : 期間，以毫秒為單位，越小越快
HTML: 複製代碼 代碼如下:<style type="text/css">
div.test {
width:400px;
margin:5px auto;
border:1px solid #ccc;
}
div.test strong {
font-size:16px;
background:#fff;
border-bottom:1px solid #aaa;
margin:0;
display:block;
padding:5px 0;
text-decoration:underline;
color:#059B9A;
cursor:pointer;
}
div.test p {
height:400px;
background:#f1f1f1;
margin:0;
}
</style>
<div class="test">
<a name="header_1" id="header_1"></a>
<strong onclick="javascript:scroller('header_4', 800);">header_1 --> header_4</strong>
<p></p>
</div>
<div class="test">
<a name="header_2" id="header_2"></a>
<strong onclick="javascript:scroller('header_5', 800);">header_2 --> header_5</strong>
<p></p>
</div>
<div class="test">
<a name="header_3" id="header_3"></a>
<strong onclick="javascript:scroller('header_6', 800);">header_3 --> header_6</strong>
<p></p>
</div>
<div class="test">
<a name="header_4" id="header_4"></a>
<strong onclick="javascript:scroller('header_7', 800);">header_4 --> header_7</strong>
<p></p>
</div>
<div class="test">
<a name="header_5" id="header_5"></a>
<strong onclick="javascript:scroller('header_3', 800);">header_5 --> header_3</strong>
<p></p>
</div>
<div class="test">
<a name="header_6" id="header_6"></a>
<strong onclick="javascript:scroller('header_2', 800);">header_6 --> header_2</strong>
<p></p>
</div>
<div class="test">
<a name="header_7" id="header_7"></a>
<strong onclick="javascript:scroller('header_1', 800);">header_7 --> header_1</strong>
<p></p>
</div>
測試代碼：複製代碼 代碼如下:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="keywords" content="平滑, 錨點, Anchor, 跳轉, 滾動, javascript, " />
<meta name="description" content="錨點(Anchor)相信很多人都不陌生，它方便訪問者在頁面的不同位置快速跳轉，直接找到自己感興趣的內容，如果說 RSS 是整個網站的摘要，那錨點就是一個頁面的摘要，通常一個頁面內容很多的時候，都會用錨點來定位。" />
<title>用 Javascript 實現錨點(Anchor)間平滑跳轉 - 平滑, 錨點, Anchor, 跳轉, 滾動, javascript, </title>
<link rel="stylesheet" href="/admin/tpl/default/css/pub_example.css" type="text/css" />
</head>
<body>
<div class="ad">
</div>
<br />
<div id="example">
<h3 id="example_title">用 Javascript 實現錨點(Anchor)間平滑跳轉</h3>
<div id="example_main">
<!--************************************* 執行個體代碼開始 *************************************-->
<script type="text/javascript">
// 說明 ：用 Javascript 實現錨點(Anchor)間平滑跳轉
// 來源 ：ThickBox 2.1
// 整理 ：Yanfu Xie [xieyanfu@yahoo.com.cn]
// 日期 ：07.01.17
// 轉換為數字
function intval(v)
{
v = parseInt(v);
return isNaN(v) ? 0 : v;
}
// 擷取元素資訊
function getPos(e)
{
var l = 0;
var t = 0;
var w = intval(e.style.width);
var h = intval(e.style.height);
var wb = e.offsetWidth;
var hb = e.offsetHeight;
while (e.offsetParent){
l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
e = e.offsetParent;
}
l += e.offsetLeft + (e.currentStyle?intval(e.currentStyle.borderLeftWidth):0);
t += e.offsetTop + (e.currentStyle?intval(e.currentStyle.borderTopWidth):0);
return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
}
// 擷取捲軸資訊
function getScroll()
{
var t, l, w, h;
if (document.documentElement && document.documentElement.scrollTop) {
t = document.documentElement.scrollTop;
l = document.documentElement.scrollLeft;
w = document.documentElement.scrollWidth;
h = document.documentElement.scrollHeight;
} else if (document.body) {
t = document.body.scrollTop;
l = document.body.scrollLeft;
w = document.body.scrollWidth;
h = document.body.scrollHeight;
}
return { t: t, l: l, w: w, h: h };
}
// 錨點(Anchor)間平滑跳轉
function scroller(el, duration)
{
if(typeof el != 'object') { el = document.getElementById(el); }
if(!el) return;
var z = this;
z.el = el;
z.p = getPos(el);
z.s = getScroll();
z.clear = function(){window.clearInterval(z.timer);z.timer=null};
z.t=(new Date).getTime();
z.step = function(){
var t = (new Date).getTime();
var p = (t - z.t) / duration;
if (t >= duration + z.t) {
z.clear();
window.setTimeout(function(){z.scroll(z.p.y, z.p.x)},13);
} else {
st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.y-z.s.t) + z.s.t;
sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.p.x-z.s.l) + z.s.l;
z.scroll(st, sl);
}
};
z.scroll = function (t, l){window.scrollTo(l, t)};
z.timer = window.setInterval(function(){z.step();},13);
}
</script>
<style type="text/css">
div.test {
width:400px;
margin:5px auto;
border:1px solid #ccc;
}
div.test strong {
font-size:16px;
background:#fff;
border-bottom:1px solid #aaa;
margin:0;
display:block;
padding:5px 0;
text-decoration:underline;
color:#059B9A;
cursor:pointer;
}
div.test p {
height:400px;
background:#f1f1f1;
margin:0;
}
</style>
<div class="test">
<a name="header_1" id="header_1"></a>
<strong onclick="javascript:scroller('header_4', 800);">header_1 --> header_4</strong>
<p></p>
</div>
<div class="test">
<a name="header_2" id="header_2"></a>
<strong onclick="javascript:scroller('header_5', 800);">header_2 --> header_5</strong>
<p></p>
</div>
<div class="test">
<a name="header_3" id="header_3"></a>
<strong onclick="javascript:scroller('header_6', 800);">header_3 --> header_6</strong>
<p></p>
</div>
<div class="test">
<a name="header_4" id="header_4"></a>
<strong onclick="javascript:scroller('header_7', 800);">header_4 --> header_7</strong>
<p></p>
</div>
<div class="test">
<a name="header_5" id="header_5"></a>
<strong onclick="javascript:scroller('header_3', 800);">header_5 --> header_3</strong>
<p></p>
</div>
<div class="test">
<a name="header_6" id="header_6"></a>
<strong onclick="javascript:scroller('header_2', 800);">header_6 --> header_2</strong>
<p></p>
</div>
<div class="test">
<a name="header_7" id="header_7"></a>
<strong onclick="javascript:scroller('header_1', 800);">header_7 --> header_1</strong>
<p></p>
</div>
<!--************************************* 執行個體代碼結束 *************************************-->
</div>
<div id="back"><a href="http://www.jb51.net">返回 首頁</a></div>
</div>
<br />
<div class="ad">
</div>
</body>
</html>
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