Java Script An Introduction By HWA

Java Script An Introduction By HWA

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  J a va S c r i p t An Introduction
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   Java Scriptis one of the most pervasive languages found on the internet and World Wide Web.  Java Script is useful in making web pages more interactive.  The pages can be made to react to the actions of the users in the form of special effects, both visual and otherwise. What is Java Script?
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   Java Scriptbegan as a joint effort between Netscape Communications Corporation and Sun Microsystems beginning in the year 1995.  Java Script is an object-based, client-side scripting language that can be used to make web pages more dynamic. Int roduct i on t o Java Scri pt
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   Java Scriptcan make use of items called objects.  The use of objects is different in Java Script because, here the objects are not class based.  There is no distinction between classes and instances. Object-based
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   Java Scriptis run on the client systems.  Here, Java Script is run on the web browser rather than on the web server which is serving a page from the website. Client-side
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   A ScriptingLanguage is very different from the conventional programming languages.  One of the main differences is that a scripting language does not require a compiler to run the program.  In a scripting language the code is interpreted as it is being loaded. This saves the time of the client. Scripting Language
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   Script Tagsare used to trigger the beginning and ending of a scripting language in a HTML document.  In the most basic forms, these scripting tags are seen as just any other HTML tags. Script Tags
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   External Scriptfile is a text file that contains Java Script code.  This is external script is used to run the code on a multiple pages.  This is a time saving act for the client. External Scripts
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   A Variableis used to hold value. A variable’s actual value can be altered at any point in time.  Variables are used when the coder does not know the kind of values that will be used in the script. Variables
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   Variables cansave time in writing and updating the scripts.  Variables include data types such as null value, number values, Boolean values, string values, etc. Variables Contd…
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   A Functioncan be defined as smaller script within a larger script.  Functions are particularly useful for performing small tasks or a series of tasks. Functions
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   Functions areuseful in dividing the whole script into smaller parts so that each task is handled.  This makes it easier to run the whole script and debug it quickly and easily Functions Contd…
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