update

src/core/jquery.js

@@ -9390,13 +9390,24 @@ jQuery.fn.offset = function( options ) {
 
 	// If we don't have gBCR, just use 0,0 rather than error
 	// BlackBerry 5, iOS 3 (original iPhone)
-	if ( typeof elem.getBoundingClientRect !== core_strundefined ) {
-		box = elem.getBoundingClientRect();
-	}
+	// if ( typeof elem.getBoundingClientRect !== core_strundefined ) {
+	// 	box = elem.getBoundingClientRect();
+	// }
+	// 解决transform下的offset问题
+	var el = elem,
+	offsetLeft = 0,
+	offsetTop  = 0;
+
+	do{
+		offsetLeft += el.offsetLeft;
+		offsetTop  += el.offsetTop;
+
+		el = el.offsetParent;
+	} while( el );
 	win = getWindow( doc );
 	return {
-		top: box.top  + ( win.pageYOffset || docElem.scrollTop )  - ( docElem.clientTop  || 0 ),
-		left: box.left + ( win.pageXOffset || docElem.scrollLeft ) - ( docElem.clientLeft || 0 )
+		top: offsetTop  + ( win.pageYOffset || docElem.scrollTop )  - ( docElem.clientTop  || 0 ),
+		left: offsetLeft + ( win.pageXOffset || docElem.scrollLeft ) - ( docElem.clientLeft || 0 )
 	};
 };