fix(audio store): FM 切换歌曲

src/store/audio.ts

@@ -94,30 +94,39 @@ const useAudioState = create<AuioState>()(
         // FM 模式，切换歌曲
         const switchFMSong = async (diff: number) => {
           if (diff === 0) return;
-          const { playQueue, playList } = get();
+          let { playQueue, playList } = get();
           if (!playQueue) return;
 
-          const index = playQueue.findIndex((item) => item.id === get().audioId);
-          const nextIndex = index + diff; // 计算后的 index
+          // 获取当前播放歌曲, 在 Queue 中的 index，并计算出下一首歌曲的 index
+          const queueIndex = playQueue.findIndex((item) => item.id === get().audioId);
+          const listIndex = playList.findIndex((item) => item.id === get().audioId);
+          const nextQueueIndex = queueIndex + diff;
+          const nextListIndex = listIndex + diff;
+
           // 播放 list 最后一首歌时，再加载30首
-          if (nextIndex >= playList.length - 1) {
+          if (nextListIndex >= playList.length - 1) {
             await getFm();
+            playQueue = get().playQueue;
+            playList = get().playList;
           }
 
-          // 判断 index 是否越界,计算音频 id
+          // 切换歌曲
           let audioId = '';
-          if (nextIndex < 0) {
+          if (nextQueueIndex < 0) {
+            // 在第一首歌点击上一首，切换到最后一首
             audioId = playQueue[playQueue.length - 1].id;
-          } else if (nextIndex >= playQueue.length) {
-            const newQueue = [...playQueue, playList[nextIndex]];
+          } else if (nextQueueIndex >= playQueue.length) {
+            // 在最后一首歌点击下一首，往 Queue 中 push 歌曲
+            const newAudio = playList[nextListIndex];
             set(
               produce((state) => {
-                state.playQueue = newQueue;
+                state.playQueue = [...playQueue, newAudio];
               }),
             );
-            audioId = newQueue[nextIndex].id;
+            audioId = newAudio.id;
           } else {
-            audioId = playQueue[nextIndex].id;
+            // 非越界切换
+            audioId = playQueue[nextQueueIndex].id;
           }
 
           // 切换歌曲