JavaScript中setTimeout与setInterval的定时执行详解

function delayedGreeting() {
  console.log('Hello, this is a delayed greeting!');
}
// 2000 毫秒后执行
setTimeout(delayedGreeting, 2000);

let counter = 0;
const intervalId = setInterval(() => {
  console.log(`Count: ${++counter}`);
  if (counter >= 5) {
    clearInterval(intervalId); // 达到条件后清除定时器
  }
}, 1000);

function asyncOperation() {
  return new Promise((resolve) => {
    setTimeout(() => {
      console.log('Async operation completed');
      resolve();
    }, 1500);
  });
}

async function executeOperations() {
  console.log('Starting...');
  await asyncOperation(); // 等待异步操作完成
  console.log('Finished!');
}
executeOperations();

let speed = 1000; // 初始间隔时间为1秒
const dynamicInterval = setInterval(() => {
  console.log('Dynamic Interval Executing');
  if (speed > 3000) {
    clearInterval(dynamicInterval); // 当间隔时间超过3秒时停止
  } else {
    clearInterval(dynamicInterval); // 清除旧的定时器
    speed += 500; // 调整间隔时间
    setInterval(arguments.callee, speed); // 使用相同的逻辑重新设定定时器
  }
}, speed);

let timerId;

function setupTimer() {
  try {
    timerId = setInterval(() => {
      console.log('Running task...');
      throw new Error('Simulated error'); // 模拟异常
    }, 1000);
  } catch (error) {
    console.error('Caught an exception:', error.message);
    clearInterval(timerId); // 遇到错误时立即清理
  }
}

setupTimer();