diff --git a/public/static/common/js/common.js b/public/static/common/js/common.js
index dbf75b87e..5d0f7da9d 100755
--- a/public/static/common/js/common.js
+++ b/public/static/common/js/common.js
@@ -4726,7 +4726,10 @@ $(function()
 			// 初始最后一个摄像头
 			if(video_scan_selected_deviceid == null)
 			{
+				// 默认取最后一个摄像头
 				video_scan_selected_deviceid = videoInputDevices[videoInputDevices.length-1].deviceId;
+				// 画像翻转
+				$video_scan.addClass('picture-reverse');
 			}
 			// 大于一个则增加列表切换
 			if(videoInputDevices.length > 1)