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Download e-book for kindle: Advanced Javascript, 2E by Chuck Easttom

By Chuck Easttom

ISBN-10: 155622852X

ISBN-13: 9781556228520

Specializes in professional-level JavaScript options, together with the newest advancements.

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You can use JavaScript to create almost anything you desire. For example, you can create an LED sign, which once could be created only with Java. Bear in mind that client-side JavaScript is executed on the user’s machine. That is, you do not have any direct access to the server’s properties with client-side JavaScript. Although that may seem to be a disadvantage, it is sometimes very convenient to have access to client-side properties rather than server-side ones. For example, you can create a digital clock that shows the current time in the client’s time n 9 zone, because JavaScript extracts the time from the client’s operating system, be it Windows 95/98/2000, Macintosh, Unix, or any other OS.

Some parts are just kept in memory until they are called. For instance, if you write a function and do not call it, the browser does not do anything with it. This part of the script stays in memory, and can be invoked later. But the real question you are wondering before you proceed with the rest of this book and learning JavaScript is, how do I put scripts into HTML documents? Any script can be placed very easily by encasing the script you write inside of two commands: There is a variety of scripting languages available for the web including VBScript (based on the Visual Basic programming language), CGI, and of course, JavaScript.

The Internet industry is quickly developing, so many new browsers will probably support JavaScript. When you load a local page that includes JavaScript, you do not have to be connected to the net; you can load it directly from your local disk. Overcoming JavaScript compatibility problems is 22 n Chapter 3 often difficult, so I suggest that you have at least one version of Netscape Navigator and one version of Microsoft Internet Explorer. Basic JavaScript Structure In order to run client-side JavaScript, you must embed the code in the HTML document.

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Advanced Javascript, 2E by Chuck Easttom

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