关于ios模拟器下，renderjs中使用web audio api报【Script error.filename:lineno:0】

逻辑层

onLoad(options) {  
    let record = '_doc/uniapp_save/1585051885897.mp3';  
    let bgm = '_doc/uniapp_save/1585051885897.mp3';  
    this.fileToArrayBuffer(record).then(res=>{  
        this.option.type = 1;  
        this.option.recordBase64 = res;  
        this.fileToArrayBuffer(bgm).then(res=>{  
            this.option.type = 2;  
            this.option.recordBase64 = res;  
        }).catch(err=>{  
        });  
    }).catch(err=>{  
    });  
},  
//将文件转为base64  
fileToArrayBuffer(filePath){  
return new Promise((resolve, reject) => {  
    plus.io.resolveLocalFileSystemURL(filePath,(entry) => {  
        // 可通过entry对象操作文件  
        entry.file((file)=>{  
            var fileReader = new plus.io.FileReader();  
            fileReader.readAsDataURL(file,'utf-8');  
            fileReader.onloadend = (event) => {  
            //base64  
            let base64 = event.target.result;;  
                resolve(base64);  
            }  
        });  
    }, function ( err ) {  
        this.$humor.msg(JSON.stringify(err));  
        reject(err);  
    });  
});  
},

渲染层

// 监听 service 层数据变更  
updateData(newValue, oldValue, ownerInstance, instance) {  
                if(newValue.type==1){  
                    if(newValue.recordBase64){  
                        // console.log("处理录音音频",newValue);  
                        this.dataURLtoArray(newValue.recordBase64).then(arrayBuffer=>{  
                            audioContext.decodeAudioData(arrayBuffer, (buffer)=> {  
                                //填充音频buffer数据  
                                userAudioBufferSourceNode.buffer = buffer  
                                //获取音频时长  
                                let durationInt = setInterval(()=>{  
                                    let duration = userAudioBufferSourceNode.buffer.duration  
                                    if(duration){  
                                        console.log("获取的音频时长：",duration)  
                                        // 调用 service 层的方法  
                                        ownerInstance.callMethod('updateDuration', {  
                                            duration: duration  
                                        })  
                                        clearInterval(durationInt)  
                                    }  
                                });  
                                //设置音频路由节点图  
                                userAudioBufferSourceNode  
                                    .connect(userGainNode)  
                                    .connect(dynamicsCompressorNode)  
                            });  
                        });  
                    }  
                }  
}  
//base64转arrayBuffer  
dataURLtoArray(base64) {  
                return new Promise((resolve,reject)=>{  
                    var arr = base64.split(','),  
                    mime = arr[0].match(/:(.*?);/)[1],  
                    bstr = atob(arr[1]),  
                    n = bstr.length,  
                    u8arr = new Uint8Array(n);  
                    while (n--) {  
                        u8arr[n] = bstr.charCodeAt(n);  
                    }  
                    let blob = new Blob([u8arr], { type: mime });  
                    blob.lastModifiedDate = new Date();  
                    blob.name = 'fileName';  
                    let fileReader = new FileReader;  
                    fileReader.readAsArrayBuffer(blob);  
                    fileReader.onload = function() {  
                        arrayBuffer = this.result;  
                        resolve(arrayBuffer);  
                    }  
                });  
},

环境：ios模拟器 iphone8