优化按键处理逻辑，使用switch语句替代随机按键选择，并调整DownKey方法以支持不同列的按键显示

ModelingMusic/MusicFrom.cs

@@ -32,7 +32,32 @@ public class MusicFrom
         {
             // 随机数
             int random = Program.random.Next(0, 7);
-            DownKey(jianpan[random]);
+            switch (random)
+            {
+                case 0:
+                    DownKey('D', 3);
+                    break;
+                case 1:
+                    DownKey('F', 10);
+                    break;
+                case 2:
+                    DownKey('G', 17);
+                    break;
+                case 3:
+                    DownKey('M', 24);
+                    break;
+                case 4:
+                    DownKey('J', 31);
+                    break;
+                case 5:
+                    DownKey('K', 38);
+                    break;
+                case 6:
+                    DownKey('L', 45);
+                    break;
+                default:
+                    break;
+            }
             Thread.Sleep(1000);
         }
     }
@@ -41,16 +66,16 @@ public class MusicFrom
         public char key;
         public bool isDown;//是否被按下
     }
-    public void DownKey(char key)
+    public void DownKey(char key, int x)
     {
         new Thread(() =>
         {
             var zIFUKEY = new ZIFUKEY() { key = key, isDown = false };
             for (int i = 0; i < MaxY; i++)
             {
-                Program.chars[i, 3].Char = zIFUKEY.key;
+                Program.chars[i, x].Char = zIFUKEY.key;
-                Thread.Sleep(500);
+                Thread.Sleep(260);
-                Program.chars[i, 3].Char = ' ';
+                Program.chars[i, x].Char = ' ';
                 if (zIFUKEY.isDown)
                 {
                     break;