jQuery滚动条定位跳转插件（jquery.scrollto.js）

使用方法：
$("被点击元素选择器").scrollTo("目标"，"speed"，"setting" )；
$.scrollTo("目标"，"speed"，"setting" );//网页初始化后立刻滚动

目标选择器可以使选择器，"top"， "bottom"

速度初始为800

设定 axis: 可选设定'xy'：横向纵向都滚动。
'x'：横向滚动

'y'：纵向滚动

easing：滚动效果（jQuery内置效果），默认滑动

我跳↓
换行键BR，撑出滚动条来
我再跳↑

jquery.scrollto.js 内容如下：

jQuery.getPos = function (e)
{
    var l = 0;
    var t  = 0;
    var w = jQuery.intval(jQuery.css(e,'width'));
    var h = jQuery.intval(jQuery.css(e,'height'));
    var wb = e.offsetWidth;
    var hb = e.offsetHeight;
    while (e.offsetParent){
        l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
        t += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
        e = e.offsetParent;
    }
    l += e.offsetLeft + (e.currentStyle?jQuery.intval(e.currentStyle.borderLeftWidth):0);
    t  += e.offsetTop  + (e.currentStyle?jQuery.intval(e.currentStyle.borderTopWidth):0);
    return {x:l, y:t, w:w, h:h, wb:wb, hb:hb};
};
jQuery.getClient = function(e)
{
    if (e) {
        w = e.clientWidth;
        h = e.clientHeight;
    } else {
        w = (window.innerWidth) ? window.innerWidth : (document.documentElement && document.documentElement.clientWidth) ? document.documentElement.clientWidth : document.body.offsetWidth;
        h = (window.innerHeight) ? window.innerHeight : (document.documentElement && document.documentElement.clientHeight) ? document.documentElement.clientHeight : document.body.offsetHeight;
    }
    return {w:w,h:h};
};
jQuery.getScroll = function (e) 
{
    if (e) {
        t = e.scrollTop;
        l = e.scrollLeft;
        w = e.scrollWidth;
        h = e.scrollHeight;
    } else  {
        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 };
};
jQuery.intval = function (v)
{
    v = parseInt(v);
    return isNaN(v) ? 0 : v;
};
jQuery.fn.ScrollTo = function(s) {
    o = jQuery.speed(s);
    return this.each(function(){
        new jQuery.fx.ScrollTo(this, o);
    });
};
jQuery.fx.ScrollTo = function (e, o)
{
    var z = this;
    z.o = o;
    z.e = e;
    z.p = jQuery.getPos(e);
    z.s = jQuery.getScroll();
    z.clear = function(){clearInterval(z.timer);z.timer=null};
    z.t=(new Date).getTime();
    z.step = function(){
        var t = (new Date).getTime();
        var p = (t - z.t) / z.o.duration;
        if (t >= z.o.duration+z.t) {
            z.clear();
            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=setInterval(function(){z.step();},13);
};

jquery.scrollto.min.js 压缩内容如下：

/**
 * jQuery.ScrollTo - Easy element scrolling using jQuery.
 * Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
 * Dual licensed under MIT and GPL.
 * Date: 5/25/2009
 * @author Ariel Flesler
 * @version 1.4.2
 *
 * http://flesler.blogspot.com/2007/10/jqueryscrollto.html
 */
;(function(d){var k=d.scrollTo=function(a,i,e){d(window).scrollTo(a,i,e)};k.defaults={axis:'xy',duration:parseFloat(d.fn.jquery)>=1.3?0:1};k.window=function(a){return d(window)._scrollable()};d.fn._scrollable=function(){return this.map(function(){var a=this,i=!a.nodeName||d.inArray(a.nodeName.toLowerCase(),['iframe','#document','html','body'])!=-1;if(!i)return a;var e=(a.contentWindow||a).document||a.ownerDocument||a;return d.browser.safari||e.compatMode=='BackCompat'?e.body:e.documentElement})};d.fn.scrollTo=function(n,j,b){if(typeof j=='object'){b=j;j=0}if(typeof b=='function')b={onAfter:b};if(n=='max')n=9e9;b=d.extend({},k.defaults,b);j=j||b.speed||b.duration;b.queue=b.queue&&b.axis.length>1;if(b.queue)j/=2;b.offset=p(b.offset);b.over=p(b.over);return this._scrollable().each(function(){var q=this,r=d(q),f=n,s,g={},u=r.is('html,body');switch(typeof f){case'number':case'string':if(/^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(f)){f=p(f);break}f=d(f,this);case'object':if(f.is||f.style)s=(f=d(f)).offset()}d.each(b.axis.split(''),function(a,i){var e=i=='x'?'Left':'Top',h=e.toLowerCase(),c='scroll'+e,l=q[c],m=k.max(q,i);if(s){g[c]=s[h]+(u?0:l-r.offset()[h]);if(b.margin){g[c]-=parseInt(f.css('margin'+e))||0;g[c]-=parseInt(f.css('border'+e+'Width'))||0}g[c]+=b.offset[h]||0;if(b.over[h])g[c]+=f[i=='x'?'width':'height']()*b.over[h]}else{var o=f[h];g[c]=o.slice&&o.slice(-1)=='%'?parseFloat(o)/100*m:o}if(/^\d+$/.test(g[c]))g[c]=g[c]<=0?0:Math.min(g[c],m);if(!a&&b.queue){if(l!=g[c])t(b.onAfterFirst);delete g[c]}});t(b.onAfter);function t(a){r.animate(g,j,b.easing,a&&function(){a.call(this,n,b)})}}).end()};k.max=function(a,i){var e=i=='x'?'Width':'Height',h='scroll'+e;if(!d(a).is('html,body'))return a[h]-d(a)[e.toLowerCase()]();var c='client'+e,l=a.ownerDocument.documentElement,m=a.ownerDocument.body;return Math.max(l[h],m[h])-Math.min(l[c],m[c])};function p(a){return typeof a=='object'?a:{top:a,left:a}}})(jQuery);

via:jquery滚动条定位插件(jquery.scrollto.js)