Question

What are the two parts of JavaScript libraries?

(a) “script” tag and “body” tag

(b) External JavaScript and the  “script” tag

(c) “html” tag and “body” tag

(d) ”html” and “style” tag

The question was asked in an online interview.

This is a very interesting question from External JavaScript and PHP topic in division Caching, Debugging and Animation of JavaScript

Answer 1

Right answer is (b) External JavaScript and the  “script” tag

Explanation: All JavaScript libraries consists of two parts:

The external JavaScript itself, which is simply a text file with the containing JavaScript code, saved as a .js file.

A “script” tag referencing the external JavaScript file and defined on the page(s) that uses the library.

The <script> element either contains scripting statements, or it points to an external script file through the src attribute.