Internet & World Wide Web: How to Program, Fifth Edition

6. JavaScript: Introduction to Scripting

Comment is free, but facts are sacred.

—C. P. Scott

The creditor hath a better memory than the debtor.

—James Howell

When faced with a decision, I always ask, “What would be the most fun?”

—Peggy Walker

Objectives

In this chapter you will:

• Write simple JavaScript programs.

• Use input and output statements.

• Learn basic memory concepts.

• Use arithmetic operators.

• Learn the precedence of arithmetic operators.

• Write decision-making statements to choose among alternative courses of action.

• Use relational and equality operators to compare data items.

Outline

6.1 Introduction

6.2 Your First Script: Displaying a Line of Text with JavaScript in a Web Page

6.3 Modifying Your First Script

6.4 Obtaining ...