Web Programming with HTML5, CSS, and JavaScript

© StationaryTraveller/Getty Images

CHAPTER 9Additional JavaScript Basics: window Object, if Statement, Strings, Numbers, and Input Validation

CHAPTER OBJECTIVES

• ▸ Use the window object to retrieve various properties of the current window.

• ▸ Display pop-up messages and retrieve user input by calling the alert, confirm, and prompt methods.

• ▸ Write if statements in order to implement branching logic.

• ▸ Learn string details—how to compare them, concatenate them, and display special characters using escape sequences.

• ▸ To process strings, learn how to call various string methods.

• ▸ To process numbers, learn how to use arithmetic operators. ...