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);
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);