侧边栏滚动效果修改

@@ -86,16 +86,16 @@ disableScroll();
 // 移动端touch重写
 var startX, startY;
 $sideNav.on('touchstart', function(e){
-    startX = e.changedTouches[0].pageX;
-    startY = e.changedTouches[0].pageY;
+    startX = e.originalEvent.touches[0].pageX;
+    startY = e.originalEvent.touches[0].pageY;
 });
 
 // 仿innerScroll方法
 $sideNav.on('touchmove', function(e){
     e.stopPropagation();
 
-    var deltaX = e.changedTouches[0].pageX - startX;
-    var deltaY = e.changedTouches[0].pageY - startY;
+    var deltaX = e.originalEvent.touches[0].pageX - startX;
+    var deltaY = e.originalEvent.touches[0].pageY - startY;
 
     // 只能纵向滚
     if(Math.abs(deltaY) < Math.abs(deltaX)){