(function ($) {

            if (!document.defaultView || !document.defaultView.getComputedStyle) {

                var oldCurCSS = jQuery.curCSS;

                jQuery.curCSS = function (elem, name, force) {

                    if (name === 'background-position') {

                        name = 'backgroundPosition';

                    }

                    if (name !== 'backgroundPosition' || !elem.currentStyle || elem.currentStyle[name]) {

                        return oldCurCSS.apply(this, arguments);

                    }

                    var style = elem.style;

                    if (!force && style && style[name]) {

                        return style[name];

                    }

                    return oldCurCSS(elem, 'backgroundPositionX', force) + ' ' + oldCurCSS(elem, 'backgroundPositionY', force);

                };

            }

            var oldAnim = $.fn.animate;

            $.fn.animate = function (prop) {

                if ('background-position' in prop) {

                    prop.backgroundPosition = prop['background-position'];

                    delete prop['background-position'];

                }

                if ('backgroundPosition' in prop) {

                    prop.backgroundPosition = '(' + prop.backgroundPosition + ')';

                }

                return oldAnim.apply(this, arguments);

            };

            function toArray(strg) {

                strg = strg.replace(/left|top/g, '0px');

                strg = strg.replace(/right|bottom/g, '100%');

                strg = strg.replace(/([-\.]+)(\s|\)|$)/g, "$1px$2");

                var res = strg.match(/(-?[-\.]+)(px|\%|em|pt)\s(-?[-\.]+)(px|\%|em|pt)/);

                return [parseFloat(res[], ), res[], parseFloat(res[], ), res[]];

            }

            $.fx.step.backgroundPosition = function (fx) {

                if (!fx.bgPosReady) {

                    var start = $.curCSS(fx.elem, 'backgroundPosition');

                    if (!start) {//FF2 no inline-style fallback

                        start = '0px 0px';

                    }

                    start = toArray(start);

                    fx.start = [start[], start[]];

                    var end = toArray(fx.end);

                    fx.end = [end[], end[]];

                    fx.unit = [end[], end[]];

                    fx.bgPosReady = true;

                }

                var nowPosX = [];

                nowPosX[] = ((fx.end[] - fx.start[]) * fx.pos) + fx.start[] + fx.unit[];

                nowPosX[] = ((fx.end[] - fx.start[]) * fx.pos) + fx.start[] + fx.unit[];

                fx.elem.style.backgroundPosition = nowPosX[] + ' ' + nowPosX[];

            };

        })(jQuery);

//动画调用示例
$("#viewBody").animate({ backgroundPosition: '(520px 0)' });