Fix bug.

modules/announcement/_annc_widget4.html.erb

@@ -78,7 +78,7 @@
 				for(var i=0;i< lilength -num ; i++)
 					$(v).find('ul.w-annc__list').eq(0).find("li.w-annc__item").eq(num).remove();
 		})
-		$('.widget-announcement-4 ul.w-annc__list >li').css('width','calc('+100/num+'% - '+20/16+'em)'); //20px=>li的margin
+		$('[data-subpart-id=\"{{subpart-id}}\"] ul.w-annc__list >li').css('width','calc('+100/num+'% - '+20/16+'em)'); //20px=>li的margin
 	};
 	$(window).resize(function(){
 		if($(window).width()>1024){