function setAudioBuffer(url){
let xhr=new XMLHttpRequest();
xhr.open("GET",url,true);
xhr.responseType="arraybuffer";
xhr.onload=function (){
context.decodeAudioData(xhr.response,function (buffer){
console.log(buffer);
return buffer;
});
}
xhr.send();
}
可以打印出buffer 但是不能作为函数返回~