用 Javascript 实现锚点(Anchor)间平滑跳转

 
<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] 
// 网址 ：http://www.codebit.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>