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Today, the editor will share with you the relevant knowledge points of Node.js functional example analysis, the content is detailed, and the logic is clear. I believe most people still know too much about this knowledge, so share this article for your reference. I hope you can get something after reading this article. Let's take a look.

Let's take a look at the following example, the following program implements the simplest function, that is, printing out "Hello world".

Const http = require ('http')

Const hostname = '127.0.0.1'

Const port = 1337

Http.createServer ((req, res) = > {

Res.writeHead (200,{ 'Content-Type':' text/plain'})

Res.end ('Hello World\ n')

}) .clients (port, hostname, () = > {

Console.log (`Server running at http://${hostname}:${port}/`);

});

In the above example, many links can be processed at the same time. Without a link request, the callback function will be called once, and if it doesn't work, node will be asleep.

Based on the above, compared with the current models that achieve concurrency through operating system threads, it is found that thread-based network applications are relatively inefficient and relatively complex to use. Further, Node users don't have to worry about process deadlocks-- because Node doesn't use locks. And there is almost no way in Node to directly manipulate Imax O, so the process will never be blocked. It is precisely because Node is not blocked that inexperienced programmers can also develop scalable systems.

Influenced by systems such as Ruby's Event Machine or Python's Twisted, Node is similar to these systems in design. Node uses the event model and takes event polling as a syntax structure rather than an application library. In other systems, event polling is started by blocking calls. A typical application is to define a behavior through a callback function at the beginning of the script, and to start a service again with a blocking call similar to EventMachine::run () at the end of the script. There is no call to start-the-event-loop in Node, just enter event polling after executing the input script, and exit polling when there is no more callback function execution. This approach is like the browser's javascript-- event polling is transparent to the user.

The above is all the content of this article "Node.js function example Analysis". Thank you for reading! I believe you will gain a lot after reading this article. The editor will update different knowledge for you every day. If you want to learn more knowledge, please pay attention to the industry information channel.

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