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Java script coding is computer coding, many things require Java, and you need to have Java enabled to view these types of programs.
by using java script
You can write java script code on any platform be it mac, linux, solaris or windows. All you need is a mac version of notepad, some html page where you insert your java script code and a web browser where you view the html page. All major browsers support java script coding and all you need to do is enable the Java Script support in browsers if it is not enabled already.
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Runescape runs using Java script.
Java script
No, Java script is not needed to play poptropica.
depending on the intention of the javascript codes you wish to write. there is much you can do with javascript but the only way to find out what "good Java script codes" are is to explore what you want the Javascript to do on the page.
Java Script allows client side modifications. In simple terms the websites which let you change the look and feel, drag & drop items, have good animations, image sliders, slideshows are more or less being done using java script. Ofcourse other languages and technologies are used but java script is the most commonly used in those scenarios.
No. There are many way of breaking into a system without using JavaScript.
Ideal thing would be to retrieve the value from PHP using AJAX and then assigning it to a java script variable. Thereafter compare it to the java script variable that is already present.