jquery.scrollTo-min.js 用户返回顶部及动画到目的地，支持目标值、锚点。

使用方法：

1.引入jQuery

2.$.scrollTo( this.hash || targetValue, time);  

example:$.scrollTo( this.hash || 0, 500);

demo

jquery.scrollTo-min.js

; (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);