优化

app/src/main/java/io/legado/app/ui/book/info/BookInfoViewModel.kt

@@ -123,7 +123,7 @@ class BookInfoViewModel(application: Application) : BaseViewModel(application) {
     }
 
     fun refreshBook(book: Book) {
-        execute {
+        execute(executeContext = IO) {
             if (book.isLocal) {
                 book.tocUrl = ""
                 book.getRemoteUrl()?.let {