do product detail page add to cart feature

@@ -211,8 +211,8 @@ class DetailModel
                     $thumbImageList[] = array('img' => Helpers::getImageUrl($value['colorImage'], 60, 60) );
                     
                     // 统计每个尺码对应的各个颜色的库存量
-                    foreach ($sizeList as &$value) {
-                        $value['colorNumStr'] = implode('/', array_values($colorStorageGroup[ $value['sizeName'] ]) );
+                    foreach ($sizeList as &$sizeArr) {
+                        $sizeArr['colorNumStr'] = implode('/', array_values($colorStorageGroup[ $sizeArr['sizeName'] ]) );
                     }
                     
                     // 商品库存总数