优化

@@ -14,7 +14,11 @@ exports.init = function() {
         var container = $('.article-type-three'),
             thumbContainer = container.find('.thumb-container'),
             prodList = container.find('.prod-list'),
-            wH = $(window).height();
+            wH = $(window).height(),
+            isInit = true,
+            tContainerH,
+            containerH,
+            containerTop;
 
         //点击分类，显示分类下推荐商品列表
         thumbContainer.delegate('.thumb', 'click', function() {
@@ -36,23 +40,26 @@ exports.init = function() {
                 placeholder     : "data:image/gif;base64,R0lGODlhAQABAJEAAAAAAP///93d3f///yH5BAEAAAMALAAAAAABAAEAAAICVAEAOw=="
             });
 
-            //scroll to top when container is fixed
-            if (thumbContainer.hasClass('fixed-top') || thumbContainer.hasClass('fixed-bottom')) {
+            //scroll to top
+            if (!isInit) {
                 $('body').animate({
                     scrollTop: container.offset().top
                 }, 800);
+            } else {
+                isInit = false;
             }
         });
 
         //默认选中第一个
         thumbContainer.find('.thumb:first-child').click();
         
+        tContainerH = thumbContainer.outerHeight(); //thumber-container高度
+        containerH = container.height(); //article-type-three高度
+        containerTop = container.offset().top; //article-type-three offset top
+
         //scroll时控制列表的位置
         $(document).scroll(function() {
-            var sTop = $(this).scrollTop(),
-                tContainerH = thumbContainer.outerHeight(), //thumber-container高度
-                containerH = container.height(), //article-type-three高度
-                containerTop = container.offset().top; //article-type-three offset top
+            var sTop = $(this).scrollTop();
 
             //Tip: removeClass只用移除相邻状态即可
             if (sTop <= containerTop - wH + tContainerH) {

@@ -30,6 +30,10 @@ $pxConvertRem : 40;
             left: 0;
             right: 0;
             bottom: 0;
+
+            .thumb.focus .arrow {
+                display: none;
+            }
         }
 
         &.absolute {
@@ -38,10 +42,6 @@ $pxConvertRem : 40;
 
         &.static {
             position: static;
-
-            .thumb.focus .arrow {
-                display: block;
-            }
         }
 
         .thumb {
@@ -60,7 +60,7 @@ $pxConvertRem : 40;
                 }
 
                 .arrow {
-                    display: none;
+                    display: block;
                     position: absolute;
                     width: 32rem / $pxConvertRem;
                     height: 19rem / $pxConvertRem;