OpenHarmony 如何将 ArrayBuffer 转化为 base64数据

OpenHarmony 如何将 ArrayBuffer 转化为 base64数据 我这里有一款应用需要将摄像头获取的图片转化为base64数据上传至服务器，不知道怎么去搞定。 下方代码是ArrayBuffer 的声明文件

/**

* Represents a raw buffer of binary data, which is used to store data for the
* different typed arrays. ArrayBuffers cannot be read from or written to directly,
* but can be passed to a typed array or DataView Object to interpret the raw
* buffer as needed.
  */
interface ArrayBuffer {
/**

  * Read-only. The length of the ArrayBuffer (in bytes).
    */
    readonly byteLength: number;

  /**

  * Returns a section of an ArrayBuffer.
    */
    slice(begin: number, end?: number): ArrayBuffer;
    }

@ohos.util (util工具函数)不知道有没有相关的方法

可以通过三方库 https://gitee.com/openharmony-sig/base64 将ArrayBuffer转为Uint8Array，再传参调用Base64.encode(input:Uint8Array)，可以生成base64数据。