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Writing JavaScript

AS YOU SAW IN Chapter 1, “Jump-Starting JavaScript,” JavaScript goes into an HTML page. However, you do not write JavaScript with the same abandon as you do HTML. Very specific and apparently minor differences exist between how HTML can be written and how JavaScript can be written. While the differences might appear to be minor or even trivial, if the rules for writing JavaScript are not followed, you can run into glitches. This chapter examines the nuances of JavaScript so that when you start writing your own scripts, you’ll have all of the basics clear in your mind.

HTML is a markup language, and JavaScript is a programming or scripting language. HTML describes what is to be presented on a page, and JavaScript dynamically changes what is on an HTML page (among other tasks.) Both use code. HTML’s code is in a series of angle brackets that describe how to treat the material between the opening and closing brackets. JavaScript is a set of statements and functions that does something in an HTML page. JavaScript can refer to and alter objects described by HTML.


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