javascript - 有没有办法以我的示例通过 React Native Expo 来执行后台任务？

Question

有没有办法以 React Native Expo 为例来执行后台任务？我只想每 5 秒创建一次 post 方法，并使用 console.log 来查看它是否有效这个例子:

this the site of the example

我想改变这个例子，我想尝试使用它来满足我的需要，那么我如何每5秒创建一次post方法以及console.log在后台？

import * as BackgroundFetch from 'expo-background-fetch';
import * as TaskManager from 'expo-task-manager';

const FETCH_TASKNAME = 'test_task'
const INTERVAL = 60

function test() {
    console.log('function is running')
}

export async function registerFetchTask() {
    TaskManager.defineTask(FETCH_TASKNAME, test);

    const status = await BackgroundFetch.getStatusAsync();
    switch (status) {
        case BackgroundFetch.Status.Restricted:
        case BackgroundFetch.Status.Denied:
            console.log("Background execution is disabled");
            return;

        default: {
            console.debug("Background execution allowed");

            let tasks = await TaskManager.getRegisteredTasksAsync();
            if (tasks.find(f => f.taskName === FETCH_TASKNAME) == null) {
                console.log("Registering task");
                await BackgroundFetch.registerTaskAsync(FETCH_TASKNAME);

                tasks = await TaskManager.getRegisteredTasksAsync();
                console.debug("Registered tasks", tasks);
            } else {
                console.log(`Task ${FETCH_TASKNAME} already registered, skipping`);
            }

            console.log("Setting interval to", INTERVAL);
            await BackgroundFetch.setMinimumIntervalAsync(INTERVAL);
        }
    }

}

Answer 1

试试这个 expo-background-fetch图书馆。这正是您在世博会上所需要的。

import * as BackgroundFetch from 'expo-background-fetch';
import * as TaskManager from 'expo-task-manager';

TaskManager.defineTask(YOUR_TASK_NAME, () => {
  try {
    const receivedNewData = // do your background fetch here
    return receivedNewData ? BackgroundFetch.Result.NewData : BackgroundFetch.Result.NoData;
  } catch (error) {
    return BackgroundFetch.Result.Failed;
  }
});

希望对你有帮助