Variables

Variables can hold numbers and strings. There are a few restrictions and rules of thumb to keep in mind when naming variables.

Statements

Statments end in a semicolon.

Strings

Strings are sequences of characters in quotation marks. You can use either type of quote, single or double. There are lots of neat things you can do to manipulate the way a string will print out. And you can use + to concatenate two strings.

document.writeln()

Use document.writeln() to write text and HTML to a Web page.

prompt

You can use prompt to get input from users.

if-then-else

You use if-then-else clauses to make your JavaScript behave differently depending on user actions.

Link events

onClick and onMouseOver inside an href can be used to run bits of JavaScript that react to user actions.

image swaps

By naming images, we can use JavaScript to change what image is displayed.

If you made it through all that stuff, Congratulations! It was a lot to learn. In Lesson 3 we'll be burrowing into the heart of JavaScript: the Document Object Model. We'll also learn about how to open and manipulate windows and frames, and we'll begin building our new browser.