How does javascript explain the operation example of the drop-down list box (select)? _ javascript skills

This article mainly introduces the operations of javascript on the drop-down list box (select. If you need it, you can refer to it and hope to help you in this article. It is mainly about the most basic methods related to javascript and select for reference by those who are not familiar with javascript. The common situation is that the person who proposes the form structure not only needs to design the logic for the program, create the data structure, but also design the form style and be familiar with javascript; some companies may require you to be proficient in photoshop: At first we were all talented.

The following is the basis of our example. This is not a standard form.

---------------------------------------------------------------------------

The Code is as follows: