https://www.lebo.cn/static/script/digitalScroll.js

1/**
2 * 数字滚动js
3 * @param {Object} $
4 */
5(function($) {
6    if (!document.defaultView || !document.defaultView.getComputedStyle) {
7        var oldCurCSS = jQuery.curCSS;
8        jQuery.curCSS = function(elem, name, force) {
9            if (name === 'background-position') {
10                name = 'backgroundPosition';
11            }
12            if (name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[name]) {
13                return oldCurCSS.apply(this, arguments);
14            }
15            var style = elem.style;
16            if (!force && style && style[name]) {
17                return style[name];
18            }
19            return oldCurCSS(elem, 'backgroundPositionX', force) + ' ' + oldCurCSS(elem, 'backgroundPositionY', force);
20        };
21    }
22
23    var oldAnim = $.fn.animate;
24    $.fn.animate = function(prop) {
25        if ('background-position' in prop) {
26            prop.backgroundPosition = prop['background-position'];
27            delete prop['background-position'];
28        }
29        if ('backgroundPosition' in prop) {
30            prop.backgroundPosition = '(' + prop.backgroundPosition + ')';
31        }
32        return oldAnim.apply(this, arguments);
33    };
34
35    function toArray(strg) {
36        strg = strg.replace(/left|top/g, '0px');
37        strg = strg.replace(/right|bottom/g, '100%');
38        strg = strg.replace(/([0-9\.]+)(\s|\)|$)/g, "$1px$2");
39        var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);
40        return [parseFloat(res[1], 10), res[2], parseFloat(res[3], 10), res[4]];
41    }
42
43    $.fx.step.backgroundPosition = function(fx) {
44        if (!fx.bgPosReady) {
45            var start = $.css(fx.elem, 'backgroundPosition');
46
47            if (!start) { //FF2 no inline-style fallback
48                start = '0px 0px';
49            }
50
51            start = toArray(start);
52
53            fx.start = [start[0], start[2]];
54
55            var end = toArray(fx.end);
56            fx.end = [end[0], end[2]];
57
58            fx.unit = [end[1], end[3]];
59            fx.bgPosReady = true;
60        }
61
62        var nowPosX = [];
63        nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];
64        nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];
65        fx.elem.style.backgroundPosition = nowPosX[0] + ' ' + nowPosX[1];
66    };
67})(jQuery);