Refactor subtitleOffset function to update range values and append items

docs/uncompiled/artplayer/index.js

@@ -5097,6 +5097,12 @@ function subtitleOffset(art) {
         onChange (item) {
             art.subtitleOffset = item.range[0];
             return item.range[0] + "s";
+        },
+        mounted: (_, item)=>{
+            art.on("subtitleOffset", (value)=>{
+                item.$range.value = value;
+                item.tooltip = value + "s";
+            });
         }
     };
 }