/* Revision for the advanced version of jQuery.  weibo.com/61557518  */
(function($) {if (!document.defaultView || !document.defaultView.getComputedStyle) {var oldCurCSS = $.curCSS;$.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(/([0-9\.]+)(\s|\)|$)/g, "$1px$2");var res = strg.match(/(-?[0-9\.]+)(px|\%|em|pt)\s(-?[0-9\.]+)(px|\%|em|pt)/);return [parseFloat(res[1], 10), res[2], parseFloat(res[3], 10), res[4]];}$.fx.step.backgroundPosition = function(fx) {if (!fx.bgPosReady) {var start = $.css(fx.elem, 'backgroundPosition');if (!start) {start = '0px 0px';}start = toArray(start);fx.start = [start[0], start[2]];var end = toArray(fx.end);fx.end = [end[0], end[2]];fx.unit = [end[1], end[3]];fx.bgPosReady = true;}var nowPosX = [];nowPosX[0] = ((fx.end[0] - fx.start[0]) * fx.pos) + fx.start[0] + fx.unit[0];nowPosX[1] = ((fx.end[1] - fx.start[1]) * fx.pos) + fx.start[1] + fx.unit[1];fx.elem.style.backgroundPosition = nowPosX[0] + ' ' + nowPosX[1];};
})(jQuery);

$("#select").animate({backgroundPosition: '(0 0)'}, {duration:300,complete: function(){  /*   动画结束执行的脚本  */});$("#select").animate({backgroundPosition: '(left -873px)'}, {duration:300})//duration 速度(单位毫秒)