July 16, 2017

Download Advanced JavaScript by Chuck Easttom PDF

By Chuck Easttom

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Hiding the Script for Old Browsers You have probably asked yourself what happens when someone loads your page with an old browser that does not support JavaScript. Since all major browsers have supported JavaScript for many years and browsers are free downloads, the chances are almost nonexistent that someone will come to your web site with a browser that is five or more years out of date. While many JavaScript programmers still put in code for handling outdated browsers, it is more out of habit than necessity.

For example, counter, Counter, and COUNTER are names of three different variables. While those three variable names are legal, and would create three separate and distinct variables, using such similar names would cause a great deal of confusion for yourself or anyone else who may need to read or modify your JavaScript. You should always avoid using such similar identifiers in the same script. However, you will want to use variable names that are related to the data they contain. For example, if you have a string variable that holds a person’s last name, you might wish to name it LastName.

Now we will begin to explore the details of JavaScript. In this chapter you will learn all the basic elements of JavaScript. As we begin to cover the basics of JavaScript, it is important to remember that it has many fundamental concepts in common with all programming languages, including its basic elements. So if you have worked with any other programming languages, this won’t be difficult to learn. It has variables that hold data, it has expressions or statements, and it has functions. These building blocks are used to construct your JavaScript script.

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