HarmonyOS Int8Array如何转回ArrayBuffer

可参考如下示例代码：

import { promptAction } from '@kit.ArkUI';
import buffer from '@ohos.buffer';

@Entry
@Component
struct Index {
  @State message: string = 'Hello World';

  get() {

    let blob: buffer.Blob = new buffer.Blob(['a', 'b', 'c']);
    let pro = blob.arrayBuffer();
    pro.then((val: ArrayBuffer) => {
      let uintarr: Uint8Array = new Uint8Array(val);
      console.log("原始的用作对照的buffer转Uint8Array打印结果："+uintarr.toString());

      //ArrayBuffer转Int8Array
      let uintarr2: Int8Array = new Int8Array(val)
      console.log('ArrayBuffer转Int8Array的Int8Array打印结果：'+uintarr2.toString());

      //Int8Array转ArrayBuffer
      let buffer = uintarr2.buffer

      let uintarr3: Uint8Array = new Uint8Array(buffer);

      console.log('Int8Array转ArrayBuffer后将buffer转Uint8Array打印结果：'+uintarr3.toString());
    });
  }

  build() {
    Column() {
      Button('点击').onClick(()=>{
        this.get()
        promptAction.showToast({message:`方法已执行`})
      })
    }.width('100%').height('100%').justifyContent(FlexAlign.Center)
  }
}