hbuilder nodejs cannot be closed

HBuilder is an integrated development environment that supports development tools for multiple platforms and languages. NodeJS is a JavaScript running environment based on the Chrome V8 engine. When developing using NodeJS in HBuilder, you will encounter some problems, such as the inability to shut down the NodeJS process normally.

First of all, we need to understand how NodeJS works. Each NodeJS process has a main thread and multiple child threads. The main thread executes code, and the sub-threads handle IO operations and asynchronous tasks. When we use NodeJS in HBuilder, a NodeJS process will be started. This process will remain running until we manually close it.

But sometimes, we cannot shut down the NodeJS process normally. This may be due to the following reasons:

1. Program error: If a program error occurs, the NodeJS process may get stuck somewhere and cannot exit normally. At this time, we need to check the error information in the program, fix the error, and then manually close the process.
2. Port occupation: If a port is used when starting the NodeJS process (such as listening to HTTP requests), the port may still be occupied after we close the process. At this time, we need to use the tools provided by the operating system to check the port occupation and close the program occupying the port.
3. IO operation is not completed: When performing IO operations, such as reading files, downloading network data, etc., if these operations are not completed, the NodeJS process cannot exit normally. At this time, we need to wait for these IO operations to complete before manually closing the process.

In order to avoid these problems, we can add some code to the program to ensure that the process can exit normally. For example, add the following code to the program:

process.on('exit', function() {
    console.log('NodeJS进程已关闭');
});

This code will be executed when the process exits and a log will be output. In this way, we can check the log to confirm whether the process has been shut down normally.

In addition, we can also use some tools to help us manage the NodeJS process. For example, PM2 (Process Manager 2) is a popular NodeJS process management tool that can help us start, stop, and monitor the NodeJS process, and provide some additional functions, such as automatic restart. Using PM2 to manage the NodeJS process, we can manage and control the process more conveniently.

In short, the NodeJS process cannot be shut down normally, which may be due to program errors, port occupation, or incomplete IO operations. In order to avoid these problems, we can add some code to the program to ensure that the process can exit normally. In addition, using some tools can also help us manage and control the process more conveniently.

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