December 2013
Intermediate to advanced
518 pages
15h 36m
English
Content preview from HTML5: The Missing Manual, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Appendix B. JavaScript: The Brains of Your Page
There was a time when the Web was all about markup. Pages held text and HTML tags, and not much more. Really advanced websites used server scripts that could tweak the HTML markup before it made its way to the browser, but the code stopped there.
Crack open a web page today and you’re likely to find buckets of JavaScript code, powering everything from vital features to minor frills. Self-completing text boxes, pop-up menus, slideshows, real-time mapping, and webmail are just a few examples of the many ways crafty developers put JavaScript to work. In fact, it’s nearly impossible to imagine a Web without JavaScript. While HTML is still the language of the Web, JavaScript is now the brains behind its most advanced pages.
In this appendix, you’ll get a heavily condensed JavaScript crash course. This appendix won’t provide a complete tutorial on JavaScript, nor does it have enough information to help you get started if you’ve never written a line of code in any programming language, ever. But if you have some rudimentary programming knowledge—say, you once learned a lick of Visual Basic, picked up the basics of Pascal, or took C out for spin—this appendix will help you transfer your skills to the JavaScript world. You’ll get just enough information to identify familiar programming ingredients like variables, loops, and conditional logic. And you’ll cover all the basic language elements that are used in the JavaScript-based examples in the ...
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