wxya（个人网站）异步原因
淘宝拉数据一亿条 5小时都没没看见问题？估计是自己写法问题（promise报错未捕获）异步未捕获导致的吧
That particular error occurs whenever your code attempts to send more than one response to the same request. There are a number of different coding mistakes that can lead to this:
每当您的代码尝试向同一请求发送多个响应时，就会发生该特定错误。 有许多不同的编码错误可能导致这种情况：
- Improperly written asynchronous code that allows multiple branches to send a response.
编写不正确的异步代码，允许多个分支发送响应。
- Not returning from the request handler to stop further code in the request handler from running after you've sent a response.
在发送响应后，不从请求处理程序返回以阻止请求处理程序中的其他代码运行。
- Calling
next()when you've already sent a response.
当您已发送响应时调用
next()。- Improper logic branching that allows multiple code paths to execute and attempt to send a response.
不正确的逻辑分支允许多个代码路径执行并尝试发送响应。
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