中共三大视频播放和背景音乐同时播放时，鼠标拖动或者滑动界面，背景音乐应停止

web/public/static/js/main_2020_show.js

@@ -92,6 +92,7 @@ var initMenuSanda = ()=>{
     }))
     menuSanda.dontTouchWarn.position.set(0,-0.2,0.004)
     menuSanda.dontTouchWarn.scale.set(0.3, 0.045, 1); 
+    menuSanda.dontTouchWarn.visible = false
     menuSanda.add(menuSanda.dontTouchWarn) 
     
     dealMap(menuSanda.buttons[0].material.map)
@@ -165,6 +166,8 @@ var clickMenuBtn = function(btn){
             }
             SandaPlayingIndex = i
             switchVideoSrc("static/videos/" + videoSrcs[i])
+            leftScreen.parent.hasSound = true
+            
         }
     })
     clearTimeout(timer1)
@@ -213,7 +216,7 @@ var backToOriginVideo = function(ifPause){
     var video = leftScreen.material.map.image 
     
     if(video.src == leftScreen.originVideoSrc)return;
-    
+    leftScreen.parent.hasSound = false
     
     video.src = leftScreen.originVideoSrc
     video.loop = true 
@@ -18337,6 +18340,7 @@ window.Modernizr = function(n, e, t) {
   
                     if(info.sid == '1626674966708' || info.sid == '1626675083157'){//三大会议视频
                         overlay.plane.originVideoSrc = overlay.plane.material.map.image.src;  
+                        
                     }else if(info.sid == "1626863308658"){
                         menuSanda = overlay