A few small questions_html/css_WEB-ITnose

<select>  <option value="1">第一个选项</option>  <option value="2">第二个选项</option>  <option value="3">第三个选项</option>  <option value="4">第四个选项</option>  <option value="5">第五个选项</option></select>

How does this code perform selected response?
And how to interact with the server when using HTML files.
Is HTML related to building a server? If you want to get involved properly (framework), what should you look at?

Reply to discussion (solution)

HTML client stuff.
Server-side programming is also required.

The poster can search for cgi implementation principles

Question 1: How to respond should be to trigger an event (usually change) when the user selects an option, and then pass the js code After the request address is sent to the backend server for processing, it is returned to the client.
Question 2: It’s hard to say how to interact. It should be a request on your page (for example: Hotspot) , when you click on the grass link, you want to send a request in the background, and then process it and then return it to the client in the background. As for the HTTP requests in the middle, I don’t really understand them. I have only heard a little bit about them.
Question 3: HTML is a language interpreted by the browser and does not require a server. Knowledge only needs a browser to solve it.

How does the HTML file interact with the server?
>> Using AJAX

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