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js retry 实现

2026-03-13 16:30:00JavaScript

实现 JavaScript 重试机制的几种方法

使用递归实现重试

通过递归函数可以在失败时重新调用自身，直到达到最大重试次数或成功为止。

function retryOperation(operation, maxRetries, delay) {
  return new Promise((resolve, reject) => {
    operation()
      .then(resolve)
      .catch(error => {
        if (maxRetries <= 0) {
          return reject(error);
        }
        setTimeout(() => {
          retryOperation(operation, maxRetries - 1, delay)
            .then(resolve)
            .catch(reject);
        }, delay);
      });
  });
}

使用循环实现重试

通过循环和async/await可以更直观地实现重试逻辑。

js retry 实现

async function retryOperation(operation, maxRetries, delay) {
  let lastError;
  for (let i = 0; i < maxRetries; i++) {
    try {
      const result = await operation();
      return result;
    } catch (error) {
      lastError = error;
      await new Promise(resolve => setTimeout(resolve, delay));
    }
  }
  throw lastError;
}

带指数退避的重试

指数退避算法可以在每次重试时增加延迟时间，避免短时间内频繁重试。

js retry 实现

async function retryWithBackoff(operation, maxRetries, initialDelay) {
  let currentDelay = initialDelay;
  let lastError;

  for (let i = 0; i < maxRetries; i++) {
    try {
      const result = await operation();
      return result;
    } catch (error) {
      lastError = error;
      await new Promise(resolve => setTimeout(resolve, currentDelay));
      currentDelay *= 2;
    }
  }
  throw lastError;
}

使用现成库实现

许多现成的JavaScript库提供了重试功能，如async-retry和p-retry。

使用p-retry示例：

const pRetry = require('p-retry');

async function run() {
  return pRetry(async () => {
    const result = await fetch('https://example.com');
    return result;
  }, {
    retries: 5,
    onFailedAttempt: error => {
      console.log(`Attempt ${error.attemptNumber} failed.`);
    }
  });
}