XMLHttpRequest with responseType set to "arraybuffer" 报错问题

[yjp1105286534]

当我打包到生产环境运行时 浏览器提示我原因XMLHttpRequest在同步请求下 responseType不允许被设置，报错
解决办法 dist/croppper.js
注释掉 // xhr.responseType = 'arraybuffer';
xhr.withCredentials = element.crossOrigin === 'use-credentials';
xhr.send();
然后再这个方法里加上 stringToArrayBuffer方法
xhr.onload = function () {
_this.read(stringToArrayBuffer(xhr.response));
};

function stringToArrayBuffer(str) {
var buf = new ArrayBuffer(str.length);
var bufView = new Uint8Array(buf);

for (var i=0, strLen=str.length; i<strLen; i++) {
    bufView[i] = str.charCodeAt(i);
}

return buf;

}