修改随机播放catched逻辑

fe/src/SoundManager.ts

@@ -34,11 +34,11 @@ class SoundManager {
         const soundName = [
             'catched_0_mp3',
             'catched_2_mp3',
-        ][num || this.rnd(0, 1)]
-        this.play({soundName})
+        ][num || (this.rnd(2) - 1)]
+        this.play({ soundName })
     }
 
-    rnd(start, end) {
-        return Math.floor(Math.random() * (end - start) + start)
+    rnd(n) {
+        return (Math.floor(Math.random() * n + 1));
     }
 }
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