修复购物车面板滑动问题。code review by LZF

@@ -77,13 +77,13 @@ function preventDefault(e) {
     e.returnValue = false;
 }
 
-function stopPropagation(e){
+function stopPropagation(e) {
     e = e || window.event;
     e.stopPropagation && e.stopPropagation();
     e.cancelBubble = false;
 }
 
-function innerScroll(e){
+function innerScroll(e) {
     var delta = e.wheelDelta || e.originalEvent.wheelDelta || e.detail || 0,
         box = $(this).get(0);
 
@@ -92,20 +92,18 @@ function innerScroll(e){
     stopPropagation(e);
 
 
-    if($(box).height() + box.scrollTop >= box.scrollHeight){
-        if(delta < 0) {
+    if ($(box).height() + box.scrollTop >= box.scrollHeight) {
+        if (delta < 0) {
             preventDefault(e);
             return false;
         }
     }
-    if(box.scrollTop === 0){
-        if(delta > 0) {
+    if (box.scrollTop === 0) {
+        if (delta > 0) {
             preventDefault(e);
             return false;
         }
     }
-    // 会阻止原生滚动
-    // return false;
 }
 
 function disableScroll() {
@@ -124,10 +122,13 @@ function disableScroll() {
 
     // 仿innerScroll方法
     $choseArea.on('touchmove', function(e) {
+        var deltaX = e.originalEvent.changedTouches[0].pageX - startX,
+            deltaY = e.originalEvent.changedTouches[0].pageY - startY;
+
+        var box = $(this).get(0);
+
         e.stopPropagation();
 
-        var deltaX = e.originalEvent.changedTouches[0].pageX - startX;
-        var deltaY = e.originalEvent.changedTouches[0].pageY - startY;
 
         // 只能纵向滚
         if (Math.abs(deltaY) < Math.abs(deltaX)) {
@@ -135,7 +136,6 @@ function disableScroll() {
             return false;
         }
 
-        var box = $(this).get(0);
 
         if ($(box).height() + box.scrollTop >= box.scrollHeight) {
             if (deltaY < 0) {