int left = 2 * i + 1; // 左子节点
When fetch() returns a response, the body is a ReadableStream. If you only check the status and don't consume or cancel the body, what happens? The answer varies by implementation, but a common outcome is resource leakage.，推荐阅读雷电模拟器官方版本下载获取更多信息
const cur = prices[i];，详情可参考heLLoword翻译官方下载
print(f"Crawling: {current_url}")
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