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可以先使用UIAbilityContext.terminateSelf退出当前应用，那个killAllProcesses是找出应用下面所有的进程的，把APP逐个kill掉。terminateSelf走UIAbility的正常生命周期，正常销毁。使用terminateSelf关闭页面后，然后在回调中执行killAllProcesses，在后台杀掉所有进程就可一处理这个问题。可以参考下面这个代码试一下。

try { 
  this.context.terminateSelf((err: BusinessError) => { 
    let applicationContext = this.context.getApplicationContext(); 
    applicationContext.killAllProcesses(); 
    if (err.code) { 
      console.error(`terminateSelf failed, code is ${err.code}, message is ${err.message}`); 
      return; 
    } 
    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}`); 
}