How to share values ​​between PHP HTML JavaScript MySQL codes

1.PHP

a.PHP -> HTML & JavaScript

html code

 />

JavaScript code
Copy code The code is as follows:

b.PHP <-> MySQL

php In the code
The code is as follows:

2.HTML

a. HTML -> PHP (POST method)

In the html code
Copy the code The code is as follows:

do.php In the file code
Copy the code The code is as follows:

b. HTML -> JavaScript


JavaScript code (available and can be changed)
Copy code The code is as follows:

3.JavaScript

a. JavaScript -> HTML ( Common law, not verified)

The
code in the JavaScript code is as follows:

html code
The code is as follows:

 
　　b. JavaScript -> PHP

　Transfer through html

1. The JavaScript code is given to html first
The code is as follows: