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      Node.js async_hooks 钩子回调 before

      Node.js async_hooks 钩子回调 before

      asyncId < number>

      When an asynchronous operation is initiated (such as a TCP server receiving a new connection) or completes (such as writing data to disk) a callback is called to notify the user. The before callback is called just before said callback is executed. asyncId is the unique identifier assigned to the resource about to execute the callback.

      The before callback will be called 0 to N times. The before callback will typically be called 0 times if the asynchronous operation was cancelled or, for example, if no connections are received by a TCP server. Persistent asynchronous resources like a TCP server will typically call the before callback multiple times, while other operations like fs.open() will call it only once.


      更多选项请参考:Node.js 异步钩子,或者通过 点击对应菜单 进行查看;


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