HarmonyOS router.back无法退出应用

import { common } from '@kit.AbilityKit';
import { BusinessError } from '@kit.BasicServicesKit';

@Entry
@Component
struct ExitPage {
  @State message: string = 'Hello World';
  context = getContext(this) as common.UIAbilityContext;

  Exit() {
    try {
      this.context.terminateSelf((err: BusinessError) => {
        if (err.code) {
          // 处理业务逻辑错误
          console.error(`terminateSelf failed, code is ${err.code}, message is ${err.message}`);
          return;
        }
        // 执行正常业务
        console.info('terminateSelf succeed');
      });
    } catch (err) {
      // 捕获同步的参数错误
      let code = (err as BusinessError).code;
      let message = (err as BusinessError).message;
      console.error(`terminateSelf failed, code is ${code}, message is ${message}`);
    }
  }

  build() {
    Column() {
      Text(this.message)
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
      Button('退出应用')
        .onClick(() => {
          this.Exit()
        })
    }
    .width('100%')
  }
}
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具体可参考一下链接：

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-inner-application-uiabilitycontext-V5#uiabilitycontextterminateself