我是 TypeScript 的新手,正在尝试使用expo-av进行音频播放。
以下代码给了我一个错误:TS2339: Property 'error' does not exist on type 'AVPlaybackStatus'.
const { sound, status } = await Audio.Sound.createAsync(track.mp3);
if (status.isLoaded) {
console.info(status.durationMillis);
}
else {
console.error("track not loaded", status.error);
}
我查看了定义,status
发现:
export type AVPlaybackStatus =
| {
isLoaded: false;
androidImplementation?: string;
error?: string; // populated exactly once when an error forces the object to unload
}
| {
isLoaded: true;
androidImplementation?: string;
uri: string;
progressUpdateIntervalMillis: number;
durationMillis?: number;
positionMillis: number;
playableDurationMillis?: number;
seekMillisToleranceBefore?: number;
seekMillisToleranceAfter?: number;
shouldPlay: boolean;
isPlaying: boolean;
isBuffering: boolean;
rate: number;
shouldCorrectPitch: boolean;
volume: number;
isMuted: boolean;
isLooping: boolean;
didJustFinish: boolean; // true exactly once when the track plays to finish
};
我以前从未见过这种构造,但我猜这是联合或交集类型(?)。
如何访问status.error
?与此类类型一起使用的典型习语/构造是什么?