品牌页面 品牌列表滚动字母置顶

@@ -8,7 +8,8 @@ var $ = require('yoho.zepto'),
     Swiper = require('yoho.iswiper'),
     lazyLoad = require('yoho.zeptolazyload');
 
-var swiper;
+var swiper,
+    $brandList = $('.brand-list');
 
 swiper = new Swiper('.swiper-container', {
     lazyLoading: true,
@@ -22,4 +23,23 @@ $('.yoho-header').css({
     'z-index': 2,
     position: 'fixed'
 });
-$('.banner-top').css('padding-top', '90px');
\ No newline at end of file
+$('.banner-top').css('padding-top', '90px');
+
+
+if($brandList.length > 0){
+    $(window).scroll(function(){
+        var scrTop = $(window).scrollTop(),
+            searchH = $('.newbrand-search').height(),
+            headerH = $('.yoho-header').height(),
+            brandSwipe = parseInt(searchH) + parseInt(headerH);
+        $('.brand-list').each(function(){
+            var offTop = $(this).offset().top - brandSwipe;
+            if(scrTop >= offTop){
+                $brandList.find('.title-bar').css('position','static');
+                $(this).find('.title-bar').css({'position':'fixed', 'top':brandSwipe});
+            }else{
+                $(this).find('.title-bar').css('position','static');
+            }
+        });
+    });
+}