uni.createInnerAudioContext() 报错{“errMsg“:“MediaError“,“errCode“:-99}

 报错原因：
uniapp的uni.createInnerAudioContext不支持直接播放base64音频文件，所以需要把base64音频转为本地音频文件再播放，缺点是转换会导致延迟，音频播放会有延迟
utils文件夹下新建tool.js文件

tool.js文件代码： 

export const base64ToFile = (base64Str, fileName, callback) => {var index = base64Str.indexOf(',');var base64Str = base64Str.slice(index + 1, base64Str.length);plus.io.requestFileSystem(plus.io.PRIVATE_DOC, function(fs) {fs.root.getFile(fileName, {create: true}, function(entry) {var fullPath = entry.fullPath;let platform = uni.getSystemInfoSync().platform;if (platform == 'android') {var Base64 = plus.android.importClass("android.util.Base64");var FileOutputStream = plus.android.importClass("java.io.FileOutputStream");try {var out = new FileOutputStream(fullPath);var bytes = Base64.decode(base64Str, Base64.DEFAULT);out.write(bytes);out.close();callback && callback(entry.toLocalURL());} catch (e) {console.log(e.message);}} else if (platform == 'ios') {var NSData = plus.ios.importClass('NSData');var nsData = new NSData();nsData = nsData.initWithBase64EncodedStringoptions(base64Str, 0);if (nsData) {nsData.plusCallMethod({writeToFile: fullPath,atomically: true});plus.ios.deleteObject(nsData);}callback && callback(entry.toLocalURL());}});});
}; 

在script下面导入 

<script>
import { base64ToFile } from "@/utils/tools.js";

 方法中使用：

      const base64Audio = uni.arrayBufferToBase64(response.data);const base64WithPrefix = `data:audio/mp3;base64,${base64Audio}`;// 使用 Promise 包装回调式的 base64ToFileconst filePath = await new Promise((resolve) => {const fileName = `${word}_${Date.now()}.mp3`;base64ToFile(base64WithPrefix, fileName, (path) => {resolve(path);});});

参考文献：
uniapp开发安卓和ios播放base64音频（mp3，wav都可以），或者处理其它类型的base64数据成为url_uniapp 播放base64-CSDN博客 uniapp能播放base64格式的音频吗？ - DCloud问答