Question

How to declare a variable, I think global, the way I declare in an html file and then use it in a js file (included by <script> tags)?

Answer 1

So as I understand, you want to use a variable from an HTML file in a JS file? To pass a variable from an HTML file to a javascript file, pass it with a function:

HTML.html

    <a href="#" onClick="test('John Doe')">Send Name</a>

Javascript.js

function test(full_name) {
 alert(full_name);
}