有时候需要将二进制图片文件 转base64,方法如下:
_arrayBufferToBase64(buffer) {
let binary = "";
let bytes = new Uint8Array(buffer);
let len = bytes.byteLength;
for (let i = 0; i < len; i++) {
binary += String.fromCharCode(bytes[i]);
}
return "data:image/jpeg;base64," + window.btoa(binary);
}