1

egret/src/soundCtrl.ts

 let soundOn = true;
+let bgOn = true;
 let bgChannel: egret.SoundChannel;
 let loading = false;
 export const getSoundOn = () => {
     return soundOn
 }
+export const getBgOn = () => {
+    return bgOn
+}
 
 export const toggleSound = () => {
     soundOn = !soundOn;
+}
+export const toggleBg = () => {
+    bgOn = !bgOn;
     if (bgChannel) {
-        if (!soundOn) {
+        if (!bgOn) {
             bgChannel.stop();
             bgChannel = null;
         }
     } else {
-        if (soundOn) {
+        if (bgOn) {
             playBg();
         }
     }