Summary of the usage of the select drop-down box in javascript, And the javascript drop-down box

Summary of the usage of the select drop-down box in javascript, And the javascript drop-down box

This article summarizes the problems encountered in the development project.
Question 1:How do I select the values in select option?
First, a method onchange () is used. This method is mainly used to trigger the change time of the content in the selection box.

Implementation Code:

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Question 2:However, during development, we generally choose content only for display, but what we really want to do is to exchange data with the background. At this time, in order to minimize http data transmission, therefore, id is generally used as a data transmission identifier. How can this problem be solved?
During development, options are generally created dynamically. At this time, we only need to dynamically create a custom attribute for you. How can we get custom attributes?
<! Doctype html> 

This is the problem I encountered during development. I hope I can be inspired by your learning experience.
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