How to Attach External File of Javascript?

The process to attach a JavaScript file with the html file is -----

1. First you have to create a JavaScript code file.
2. Save it with extension .js.
3. Now create an HTML code file.
4. Give the complete address of js file into script tag under src=" ".
5. Save it with extension .html or .htm.
6. Run HTML file.

Example:--

JavaScript Code:---

var m1,m2,m3;

m1=prompt("Enter the 1st no.:");

m2=prompt("Enter the 2nd no.:");

m1=parseInt(m1);

m2=parseInt(m2);

m3=m1+m2;

document.write("Addition is :" +m3);

HTML Code:---

Input:---

Output:---

Addition is 36.