- (function($) {
- if(!document.defaultView || !document.defaultView.getComputedStyle){ // IE6-IE8
- 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 = $.curCSS(fx.elem,'backgroundPosition');
- if(!start){//FF2 no inline-style fallback
- 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;
- }
- //return;
- 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);
- //该片段来自于http://www.codesnippet.cn/detail/191120137269.html
来源: http://www.codesnippet.cn/detail/191120137269.html