我將如何將這段代碼放入一個可重用的函數中？

Question

我發現這個代碼在stackoverflow緩慢地淡出音軌。它運作良好。它的結構方式使我很難在沒有複製和粘貼的情況下重複使用，因爲函數本身會自行調用。以下是代碼：

function fadeVolume(volume, callback) { 
    //change the volume by factor each time 
    //will check if setTimeout is used to loop as well as wait, as it seems so here 
    var factor = 0.02, 
     speed = 50; 
    if (volume > factor) { 
     setTimeout(function() { 
      fadeVolume((gameController.myAudio.preGameTrack.volume -= factor), callback); 
     }, speed); 
    } else { 
     (typeof (callback) !== 'function') || callback(); 
    } 
}; 
fadeVolume(gameController.myAudio.preGameTrack.volume, function() { 
    preGameContent.ready = true; 
    //stop the music altogether 
    gameController.myAudio.preGameTrack.pause(); 
    gameController.myAudio.preGameTrack.currentTime = 0; 
}) 

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