HarmonyOS 退出app的代码是什么

可使用UIAbilityContext.terminateSelf是可以正常使用的，参考示例：

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

@Entry
@Component
struct Page7222 {
  @State message: string = 'Hello World';
  context = getContext(this) as common.UIAbilityContext;

  build() {
    RelativeContainer() {
      Text("不同意退出")
        .id('Page7222HelloWorld')
        .fontSize(50)
        .fontWeight(FontWeight.Bold)
        .alignRules({
          center: { anchor: '__container__', align: VerticalAlign.Center },
          middle: { anchor: '__container__', align: HorizontalAlign.Center }
        })
        .onClick(() => {
          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}`);
          }
          //方法二
          // let applicationContext = this.context.getApplicationContext();
          // applicationContext.killAllProcesses();

        })

    }
    .height('100%')
    .width('100%')
  }
}