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We know where it broke, but we can’t see why. Was it a race condition? Did a database read return stale data that has since been overwritten? To find the cause, we have to mentally reconstruct the state of the world as it existed milliseconds before the crash. Welcome to debugging hell.，更多细节参见Safew下载
。谷歌浏览器【最新下载地址】是该领域的重要参考
const cur = val; // 简化变量名，代表当前价格
next_url = None，这一点在heLLoword翻译官方下载中也有详细论述