JavaScript 实现固定时间点执行任务的代码示例

npm install date-fns

function executeAt(targetTime) {
  const now = Date.now();
  const delay = targetTime - now;
  if (delay > 0) {
    setTimeout(() => {
      console.log('Task executed at:', new Date().toLocaleTimeString());
    }, delay);
  } else {
    console.log('The target time has already passed.');
  }
}

const target = new Date();
target.setHours(14, 0, 0, 0); // 设定为下午2点整
executeAt(target.getTime());

import { differenceInMilliseconds } from 'date-fns';

function scheduleDailyTask(hour, minute) {
  function scheduleNextRun() {
    const now = new Date();
    let target = new Date(now.getFullYear(), now.getMonth(), now.getDate(), hour, minute);
    if (now > target) {
      target = new Date(target.getTime() + 24 * 60 * 60 * 1000); // 如果已经过了今天的这个时间，则安排到明天
    }
    const delay = differenceInMilliseconds(target, now);
    setTimeout(() => {
      console.log('Daily task executed at:', new Date().toLocaleTimeString());
      scheduleNextRun(); // 完成后重新安排下一次运行
    }, delay);
  }

  scheduleNextRun();
}

scheduleDailyTask(9, 30); // 每天早上9:30执行任务

import { setDefaultOptions, utcToZonedTime } from 'date-fns-tz';

setDefaultOptions({ timeZone: 'America/New_York' }); // 设置默认时区

function executeInTimeZone(targetTimeStr, timeZone) {
  const now = new Date();
  const target = utcToZonedTime(new Date(targetTimeStr), timeZone);
  const delay = target.getTime() - now.getTime();
  if (delay > 0) {
    setTimeout(() => {
      console.log(`Task executed in ${timeZone} at:`, new Date().toLocaleTimeString());
    }, delay);
  } else {
    console.log('The target time in the specified timezone has already passed.');
  }
}

executeInTimeZone('2025-01-27T14:00:00', 'America/New_York');

let lastActivityTime = Date.now();

window.addEventListener('mousemove', () => {
  lastActivityTime = Date.now();
});

function checkUserActivity(timeout) {
  const currentTime = Date.now();
  if (currentTime - lastActivityTime > timeout) {
    console.log('No user activity detected for an hour. Cleaning up...');
    // 执行清理缓存或其他任务
  } else {
    setTimeout(checkUserActivity, 1000, timeout); // 每秒检查一次
  }
}

checkUserActivity(60 * 60 * 1000); // 一个小时没有活动则触发

function safeExecuteTask(taskFunction, targetTime) {
  try {
    const delay = targetTime - Date.now();
    if (delay > 0) {
      setTimeout(() => {
        taskFunction();
      }, delay);
    } else {
      throw new Error('Target time is in the past');
    }
  } catch (error) {
    console.error('Failed to schedule task:', error.message);
  }
}

safeExecuteTask(() => {
  console.log('Executing task...');
}, new Date().getTime() + 5000); // 5秒后执行