react-native 无头 js 任务中的超时

Question

I am developing a react-native applicaton with a headless js task to make some background work.

module.exports = async (taskData) => {

    for (let i = 0; i < 30; i++) {
        setTimeout(function(){
            console.log(i);            
        }, 1000*i + 100);
    }

    return;
}

Answer 1

I faced the same issue and went into debugging it. The problem is with how the ReactContext is constructed when your app is in the background. The context signals to have been created BEFORE the TimingModule<\/code> is initialized and your task is instantly executed by the HeadlessJsTaskService<\/code> (before the TimingModule<\/code> is initialized).

  public void addTaskEventListener(HeadlessJsTaskEventListener listener) {
    mHeadlessJsTaskEventListeners.add(listener);
  }