Node.js 循环中错误处理与流程控制策略

function processItems(items) {
  try {
    for (let i = 0; i < items.length; i++) {
      console.log(`Processing item ${i}: ${items[i]}`);
      try {
        // 模拟可能出错的操作
        if (items[i] === 'error_item') {
          throw new Error(`Failed to process: ${items[i]}`);
        }
        // 模拟发送数据或执行其他操作
        // sendSomething(items[i]);
      } catch (e) {
        console.error(`ERROR IN LOOP at index ${i}: ${e.message}`);
        // 关键：立即中断循环
        break;
      }
    }
    console.log("YAY! LOOP finished (only if no break occurred)");
  } catch (e) {
    console.error("ERROR outside loop (this catch won't be hit by inner errors)");
  }
}

// 示例调用
processItems(['item1', 'item2', 'error_item', 'item4']);
// 预期输出：
// Processing item 0: item1
// Processing item 1: item2
// Processing item 2: error_item
// ERROR IN LOOP at index 2: Failed to process: error_item
// (不会打印 "YAY! LOOP finished")

function processAllItems(items) {
  let errorFlag = false; // 初始化错误标志

  for (let i = 0; i < items.length; i++) {
    console.log(`Processing item ${i}: ${items[i]}`);
    try {
      // 模拟可能出错的操作
      if (items[i].includes('error')) {
        throw new Error(`Failed to process: ${items[i]}`);
      }
      // 模拟发送数据或执行其他操作
      // sendSomething(items[i]);
    } catch (e) {
      console.error(`ERROR IN LOOP at index ${i}: ${e.message}`);
      errorFlag = true; // 标记有错误发生
    }
  }

  // 循环结束后，根据 errorFlag 进行判断
  if (errorFlag) {
    console.warn("WARNING: Some errors occurred during loop execution.");
    // 可以在这里执行错误聚合、发送通知、记录详细日志等
    // 例如：
    // throw new Error("Batch processing completed with errors.");
    // return; // 阻止后续成功消息
  } else {
    console.log("YAY! LOOP finished successfully.");
  }
}

// 示例调用 1：无错误
processAllItems(['item1', 'item2', 'item3']);
// 预期输出：
// Processing item 0: item1
// Processing item 1: item2
// Processing item 2: item3
// YAY! LOOP finished successfully.

console.log('---');

// 示例调用 2：有错误
processAllItems(['itemA', 'error_itemB', 'itemC', 'error_itemD']);
// 预期输出：
// Processing item 0: itemA
// Processing item 1: error_itemB
// ERROR IN LOOP at index 1: Failed to process: error_itemB
// Processing item 2: itemC
// Processing item 3: error_itemD
// ERROR IN LOOP at index 3: Failed to process: error_itemD
// WARNING: Some errors occurred during loop execution.
// (不会打印 "YAY! LOOP finished successfully.")