HarmonyOS 能否提供扫码的demo代码

h5拉起系统扫码页面的demo如下：

// WebComponent.ets：
import web_webview from '@ohos.web.webview'
import { scanCore, scanBarcode } from '@kit.ScanKit';
// 导入默认界面需要的日志模块和错误码模块
import { hilog } from '@kit.PerformanceAnalysisKit';
import { BusinessError } from '@kit.BasicServicesKit';

let options: scanBarcode.ScanOptions = {
  scanTypes: [scanCore.ScanType.ALL],
  enableMultiMode: true,
  enableAlbum: true
};

class TestClass {
  // arkts h5都用await保障执行顺序
  async scan(): Promise<string> {
    let scanResult = await scanBarcode.startScanForResult(getContext(this), options)
    // 收到扫码结果后返回
    hilog.info(0x0001, '[Scan CPSample]', 'Promise scan result: %{public}s', JSON.stringify(scanResult));
    return scanResult.originalValue;
  }
}

@Entry
@Component
export struct PageWeb {
  readonly webUrl: string | Resource = 'www.huawei.com'
  readonly controller: WebviewController = new web_webview.WebviewController()
  userAgentAlreadySet: boolean = false
  @State customUserAgent?: string = undefined
  @State testObj: TestClass = new TestClass();

  build() {
    if (this.customUserAgent) {
      Column() {


        Web({ src: $rawfile('index.html'), controller: this.controller })
          .domStorageAccess(true)
          .javaScriptProxy({
            object: this.testObj,
            name: "testObjName",
            methodList: ["scan"],
            controller: this.controller
          })

      }
    }
  }

  aboutToAppear(): void {
    // 模拟异步构建 customUserAgent 过程
    setTimeout(() => this.customUserAgent = 'ua/value', 200)
  }

  applyCustomUserAgent(): void {
    this.userAgentAlreadySet = true
    let defaultUserAgent = this.controller.getUserAgent()
    this.controller.setCustomUserAgent(defaultUserAgent + ' ' + this.customUserAgent)
    this.controller.loadUrl(this.webUrl)
  }

  onBackPress(): boolean | void {
    // 自定义页面返回逻辑
    // if (this.controller.accessBackward()) {
    // this.controller.backward()
    // return true
    // }
    return true;
  }
}
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