audio 标签 error 打印错误类型
var audio = new Audio();
document.body.appendChild(audio);
audio.src = "allofMe2.mp3";
audio.autoplay = true;
audio.controls = true;
audio.addEventListener("error", function () {
    console.log("error message: " + audio.error.message);
    console.log("error code: " + audio.error.code);
});  
这样就可以打印出错误类型
interface MediaError {
    readonly code: number;
    readonly message: string;
    readonly msExtendedCode: number;
    readonly MEDIA_ERR_ABORTED: number;
    readonly MEDIA_ERR_DECODE: number;
    readonly MEDIA_ERR_NETWORK: number;
    readonly MEDIA_ERR_SRC_NOT_SUPPORTED: number;
    readonly MS_MEDIA_ERR_ENCRYPTED: number;
} 
