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用Javascript实现锚点(Anchor)间平滑跳转

时间:2021-07-01 10:21:17 帮助过:15人阅读

锚点(Anchor)相信很多人都不陌生,它方便访问者在页面的不同位置快速跳转,直接找到自己感兴趣的内容,如果说 RSS 是整个网站的摘要,那锚点就是一个页面的摘要,通常一个页面内容很多的时候,都会用锚点来定位。

但是锚点也有个问题,通常点击锚点后,页面会立即跳到目标位置,而本文介绍的方法,实现了锚点(Anchor)间平滑跳转,效果非常不错。
代码如下:
<script type="text/javascript">
// 说明 :用 Javascript 实现锚点(Anchor)间平滑跳转
// 来源 :ThickBox 2.1
// 整理 :Yanfu Xie [xieyanfu@yahoo.com.cn]
// 日期 :07.01.17
// 转换为数字
function intval(v)
{
v = parseInt(v);
return isNaN(v) ? 0 : v;
}
// 获取元素信息
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};
}
// 获取滚动条信息
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 };
}
// 锚点(Anchor)间平滑跳转
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>


调用方式:
代码如下:

scroller(el, duration)
el : 目标锚点 ID
duration : 持续时间,以毫秒为单位,越小越快

HTML:
代码如下:

<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>

测试代码:
代码如下:
<!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, 锚点, Anchor, 跳转, 滚动, javascript, " />
<meta name="description" content="锚点(Anchor)相信很多人都不陌生,它方便访问者在页面的不同位置快速跳转,直接找到自己感兴趣的内容,如果说 RSS 是整个网站的摘要,那锚点就是一个页面的摘要,通常一个页面内容很多的时候,都会用锚点来定位。" />
<title>用 Javascript 实现锚点(Anchor)间平滑跳转 - 平滑, 锚点, Anchor, 跳转, 滚动, 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 实现锚点(Anchor)间平滑跳转</h3>

    <div id="example_main">


<!--************************************* 实例代码开始 *************************************-->

<script type="text/javascript">

// 说明 :用 Javascript 实现锚点(Anchor)间平滑跳转
// 来源 :ThickBox 2.1
// 整理 :Yanfu Xie [xieyanfu@yahoo.com.cn]
// 日期 :07.01.17

// 转换为数字
function intval(v)
{
    v = parseInt(v);
    return isNaN(v) ? 0 : v;
}

// 获取元素信息
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};
}

// 获取滚动条信息
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 };
}

// 锚点(Anchor)间平滑跳转
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>

<!--************************************* 实例代码结束 *************************************-->


    </div>

    <div id="back"><a href="//www.gxlcms.com">返回 首页</a></div>

</div>

<br />

<div class="ad">
</div>

</body>
</html>

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