为onPlay和onCanPlay都添加监听事件，在yes那一行就能正确获取duration值了，也不会影响播放效果。 function onCanPlay() { console.log("oncanplay: ", audioContext.duration); audioContext.play(); } function onPlay() { console.log("onplay: ", audioContext.duration); const duration = audioContext.duration; if (duration) { console.log("yes", audioContext.duration) totalTime.value = duration; } else { console.log("no", audioContext.duration) audioContext.stop(); audioContext.play(); } } audioContext.onCanplay(onCanPlay); audioContext.onPlay(onPlay);