我相信这需要一个 jQuery 扩展。它有点笨重,但这是一个工作示例
/**
* @author Alexander Farkas
* v. 1.02
*
* Edited by Nelson Wells for jQuery 1.8 compatibility
*/
(function($) {
$.extend($.fx.step,{
backgroundPosition: function(fx) {
if (fx.pos === 0 && typeof fx.end == 'string') {
var start = $.css(fx.elem,'backgroundPosition');
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]];
}
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];
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]];
}
}
});
})(jQuery);
$('.test').animate({
'background-position-x': '100px',
'background-position-y': '200px',
backgroundPosition:"+100px 200px"
}, 400, 'linear');