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Advanced Javascript, 2E by Chuck Easttom PDF

By Chuck Easttom

ISBN-10: 155622852X

ISBN-13: 9781556228520

Makes a speciality of professional-level JavaScript concepts, together with the newest advancements.

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Extra info for Advanced Javascript, 2E

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0 or later, and you see this message, you need to enable JavaScript by choosing Options | Network Preferences. You might be asking yourself how an old browser that does not even recognize scripts can interpret the portion correctly. A JavaScript-enabled browser simply ignores that section when JavaScript is enabled. However, an old browser does not know this tag and ignores it. It does not ignore the interior of the 3 Chapter An old browser begins to interpret the code as a plain HTML comment when it encounters the

However, their implementations of objects are different. JavaScript is an object-based language. It supports built-in, extensible objects, but no classes or inheritance. Its object hierarchy is not an inheritance hierarchy as in Java. JavaScript features two types of objects: n Static objects—objects that combine general functions (methods) and data constructs (properties). The values of such objects’ properties are usually read-only. A static object is a single object, and thus does not enable you to create instances of it.

N Additional processing. The JavaScript interpreter evaluates all functions found in your script header, including those defined in the external file, and stores them in memory. Loading unneeded functions in an external file degrades the script performance. n Additional server access. You know how irritating it is to wait until another page loads in the window, especially with slow modem connections. That is the problem with the SRC attribute. When the browser comes across the tag that tells it to interpret JavaScript code in another file, it must first load that file.

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Advanced Javascript, 2E by Chuck Easttom

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