Advanced JavaScript, Third Edition by Chuck Easttom

By Chuck Easttom

Complex JavaScript 3rd version presents an in-depth exam of an important good points of JavaScript. starting with an outline of JavaScript, the ebook speedy strikes into extra complicated positive factors wanted for advanced but strong JavaScript scripts, equivalent to items, arrays, and date and time capabilities. also, numerous positive factors of JavaScript which are crucial for contemporary websites are mentioned, together with manipulating the prestige bar, developing dynamic calendars, and dealing with kinds, photos, and the record item version. a variety of examples illustrate find out how to enforce a variety of concepts. issues lined: tips on how to increase your websites with LED indicators, banners, and photographs imposing cookies to shop and retrieve details The constitution of the rfile item version and the way it may be used to view, entry, and alter an HTML rfile security features to guard deepest info whereas utilizing the net

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Both Java and JavaScript are based on objects. 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.

Another difference between Java and JavaScript is their time of binding. JavaScript features dynamic binding, so all object references are checked at run time. Java, on the other hand, is based on static binding, meaning that all object references must exist and be valid at compile time. However, an object-oriented language may require dynamic method bindings because polymorphism allows multiple definitions of methods sharing a common name, and calling such polymorphic methods often cannot be resolved until run time.

First, your script is not as immediately and easily viewable as your HTML. ) Also, some web developers have common scripts they use on multiple pages. I rarely use external scripts in this book, but you should remember that they exist as you may find them helpful. External scripts are useful when you need to integrate a long, sophisticated JavaScript script into an HTML file. Here are some disadvantages of using an external file: n No back references. JavaScript scripts are mainly driven by user-initiated events.

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