update to show footer. code review by XWG

@@ -19,11 +19,21 @@ require('./desc');
 require('./comments-consults');
 
 //add extra marign-bottom for footer to show the yoho copyright
-
 function showFooter() {
-    window.reMarginFooter('.cart-bar');
+    var $cartBar = $('.cart-bar');
+
+    var timer = setInterval(function() {
+        if ($cartBar) {
+            window.reMarginFooter('.cart-bar');
+            clearInterval(timer);
+        } else {
+            $cartBar = $('.cart-bar');
+        }
+    }, 200);
 }
 
+showFooter();
+
 lazyLoad($('img.lazy'));
 
 //顶部swiper
@@ -57,6 +67,6 @@ if (goodsDiscountHammer) {
     });
 }
 
+
 require('./like');
 
-$(document).ready(showFooter);