show stander bottom when there is fixed bottom element on page

@@ -106,6 +106,20 @@ function rePosFooter() {
     }
 }
 
+/**
+ *
+ * add extra margin-bottom for footer to show yoho copyright when there is fixed bottom element on page
+ * @param {String} The jquery selecor of the fixed bottom element
+ * @return undefined
+ */
+function reMarginFooter(fixedElement) {
+    var fixedElH = $(fixedElement).outerHeight();
+
+    if(fixedElement){
+        $footer.css('margin-bottom', fixedElH + 'px');
+    }
+}
+
 //页面通用底部位置及status设置
 (function() {
     var $op = $footer.children('.op-row');
@@ -215,3 +229,5 @@ window.getUid = getUid;
 window.getShoppingKey = getShoppingKey;
 
 window.rePosFooter = rePosFooter;
+
+window.reMarginFooter = reMarginFooter;

@@ -221,9 +221,7 @@ $('.home-header .iconfont').on('touchstart', function() {
 });
 
 // 底部留出tab 的高度
-$('#yoho-footer').css({
-    'margin-bottom': '2.5rem'
-});
+window.reMarginFooter('.footer-tab');
 
 //set cookie
 exports.set = function(c) {

@@ -15,7 +15,8 @@ var goodsSwiper,
 require('./desc');
 require('./comments-consults');
 
-
+//add extra marign-bottom for footer to show the yoho copyright
+window.reMarginFooter('.cart-bar');
 
 lazyLoad($('img.lazy'));