[BUG]xmlHtppRequest GET 图片或者声音获得的response为空

cocos2dx -js 3.15.1

var url=“https://forum.cocos.com/uploads/default/original/3X/c/3/c3624bc9a1dafa3e421d13373dc46ef2cae00026.png
var xhr = new XMLHttpRequest();
xhr.responseType=“arraybuffer”;
xhr.conentType=“audio/mpeg”;
xhr.onreadystatechange = function () {
cc.log("xhr.readyState " +xhr.readyState);
cc.log("xhr.status " +xhr.status);
trace(xhr.response)

        }.bind(this);
        xhr.open("GET", url, true);
        xhr.send();