code review by hf: merge master code to develop

@@ -5380,6 +5380,7 @@ var $chosePanel = $('#chose-panel'),
     queryString,
     $yohoPage = $('.yoho-page');
 
+
 //初始化购物车面板显示
 function init() {
     hasChooseColor = false;
@@ -5408,7 +5409,19 @@ function checkColorSizeNum() {
     return true;
 }
 
+
 function show(html, cb) {
+    var scrollPosition = [
+            document.documentElement.scrollLeft || document.body.scrollLeft,
+            document.documentElement.scrollTop || document.body.scrollTop
+        ],
+        $html = $('html'); // it would make more sense to apply this to body, but IE7 won't have that
+
+    $html.data('scroll-position', scrollPosition);
+    $html.data('previous-overflow', $html.css('overflow'));
+    $html.css('overflow', 'hidden');
+    window.scrollTo(scrollPosition[0], scrollPosition[1]);
+
     if (html) {
         $chosePanel.html(html);
         if ($('#promotionId').val() !== '') {
@@ -5424,6 +5437,12 @@ function show(html, cb) {
 
 //隐藏当前Panel
 function hide() {
+    var $html = $('html'),
+        scrollPosition = $html.data('scroll-position');
+
+    // un-lock scroll position
+    $html.css('overflow', $html.data('previous-overflow'));
+    window.scrollTo(scrollPosition[0], scrollPosition[1]);
     $('.chose-panel').hide();
 }
 
@@ -6496,7 +6515,7 @@ optHammer.on('tap', function(e) {
                 }
             }).then(function(res) {
                 $('#dialog-wrapper').hide();
-                if (!res) {
+                if ($.type(res) !== 'object') {
                     return;
                 }
                 if (res.message) {
@@ -6525,7 +6544,7 @@ optHammer.on('tap', function(e) {
                 }
             }).then(function(res) {
                 $('#dialog-wrapper').hide();
-                if (!res) {
+                if ($.type(res) !== 'object') {
                     return;
                 }
                 if (res.message) {
@@ -8775,15 +8794,16 @@ if ($('.freebie').length > 0) {
 }
 
 $('.btn-balance').on('touchend', function() {
-    if (shouldSelectGift()) {
-        showChooseGifDialog();
-        return false;
-    }
     if (shouldLowStocks()) {
         tip.show('库存不足无法结算');
         return false;
     }
 
+    if (shouldSelectGift()) {
+        showChooseGifDialog();
+        return false;
+    }
+
     if (hasChecked) {
         window.location.href = '/cart/index/orderEnsure?cartType=' + cartType;
     } else {
@@ -9007,6 +9027,10 @@ function bottomCheckBoxHandeler(isSelected, type, handlerAfterTouch) {
 
 //全选按钮点击事件
 $selectAllBtn.on('touchend', function() {
+    if ($('.low-stocks').length > 0) {
+        tip.show('所选商品中含有库存不足的商品');
+        return false;
+    }
     bottomCheckBoxHandeler($(this).hasClass('icon-cb-checked'), $('#cartType').val(), didUpdateAllGoodsCheckStatus);
 });