调整核心玩法细节表现

src/models/DOBlock.ts

@@ -30,8 +30,6 @@ export class DOBlock {
         this.data.show = show
         if (show == this.get_correct())
             this.checked = true
-        if (this.get_checked() || show == 0)
-            this.clean_notes()//正确或者擦除
         StorageManager.getInstance().onChanged()
     }
 
@@ -46,14 +44,18 @@ export class DOBlock {
     public get_notes(): Array<number> {
         return this.data.notes
     }
-    public add_note(noteNumber: number): boolean {
-        var b = false
+    public add_note(noteNumber: number): void {
         if (this.data.notes.indexOf(noteNumber) < 0) {
             this.data.notes.push(noteNumber)
             StorageManager.getInstance().onChanged()
-            b = true
         }
-        return b
+    }
+    public remove_note(noteNumber: number): void {
+        var find = this.data.notes.indexOf(noteNumber)
+        if (find >= 0) {
+            this.data.notes.splice(find, 1)
+            StorageManager.getInstance().onChanged()
+        }
     }
     public clean_notes(): void {
         if (this.data.notes.length > 0) {