Jun 20, 2018 - You can write, run, and examine the results of code that interacts with the web. The File menu offers options to save and load JavaScript code. Reading (Loading) and Writing (Saving) Small Text Files. To work in Firefox, using HTML and/or Javascript (without PHP or PERL.the code needs to be portable, and I can't always guarantee the.

Chapter 1. Writing Your First JavaScript Program By itself, HTML doesn’t have any smarts: It can’t do math, it can’t figure out if someone has correctly filled out a form, and it can’t make decisions based on how a web visitor interacts with it. Basically, HTML lets people read text, look at pictures, watch videos, and click links to move to other web pages with more text, pictures, and videos. In order to add intelligence to your web pages so they can respond to your site’s visitors, you need JavaScript. JavaScript lets a web page react intelligently. With it, you can create smart web forms that let visitors know when they’ve forgotten to include necessary information.

You can make elements appear, disappear, or move around a web page (see ). You can even update the contents of a web page with information retrieved from a web server—without having to load a new web page. In short, JavaScript lets you make your websites more engaging, effective, and useful. FREQUENTLY ASKED QUESTION: Compiled vs. Scripting Languages JavaScript is called a scripting language. I’ve heard this term used for other languages like PHP and ColdFusion as well.

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What’s a scripting language? Most of the programs running on your computer are written using languages that are compiled. Compiling is the process of creating a file that will run on a computer by translating the code a programmer writes into instructions that a computer can understand. Once a program is compiled, you can run it on your computer, and because a compiled program has been converted directly to instructions a computer understands, it will run faster than a program written with a scripting language. Unfortunately, compiling a program is a time-consuming process: You have to write the program, compile it, and then test it. If the program doesn’t work, you have to go through the whole process again. A scripting language, on the other hand, is only compiled when an interpreter (another program that can convert the script into something a computer can understand) reads it.

In the case of JavaScript, the interpreter is built into the web browser. So when your web browser reads a web page with a JavaScript program in it, the web browser translates the JavaScript into something the computer understands. As a result, a scripting language operates more slowly than a compiled language, because every time it runs, the program must be translated for the computer. Scripting languages are great for web developers: Scripts are generally much smaller and less complex than desktop programs, so the lack of speed isn’t as important.

In addition, because they don’t require compiling, creating and testing programs that use a scripting language is a much faster process. What’s a Computer Program? When you add JavaScript to a web page, you’re writing a computer program. Granted, most JavaScript programs are much simpler than the programs you use to read email, retouch photographs, and build web pages. But even though JavaScript programs (also called scripts) are simpler and shorter, they share many of the same properties of more complicated programs. In a nutshell, any computer program is a series of steps that are completed in a designated order.