jquery.scrollTo-min.js

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

用法：

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);