Complete Tutorial on Usage of JavaScript Variables and Built-In Functions

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With JavaScript you can update the content on your pages automatically--every day, every hour, or every second. In this chapter, I'll focus on a simple script that automatically changes the date on your web page.

Along the way you'll learn:

• How JavaScript uses variables to remember simple items such as names and numbers
• How JavaScript keeps track of more complicated items such as dates
• How to use JavaScript functions to write information to your web page

Before getting into the nuts and bolts of functions and variables, let's take a look at a couple of examples of web pages that automatically update themselves, starting with the European Space Agency. As you can see in Figure , the ESA's home page shows you the current date. Rather than change the home page every day, the ESA uses JavaScript to change the date automatically.

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RECOMMENDED FURTHER READING


Using JavaScript Variables and Built-In Functions, Part 2



Using JavaScript Variables and Built-In Functions, Part 3



Writing Your Own JavaScript Functions