Q1. What is JavaScript?
Ans:
JavaScript is a platform-independent,event-driven, interpreted client-side
scripting and
programming language developed by Netscape Communications Corp. and Sun
Microsystems. Q2.How to read and write a file using javascript?
Ans: I/O operations like reading or writing a file is not possible with client-side javascript.
However , this can be done by coding a Java applet that reads files for the
script. Q3.How to detect the operating system on the client machine?
Ans: In order to detect the operating system on the client machine, the navigator.appVersion
string (property) should be used.
Q4.Where are cookies actually stored on the hard disk?
Ans:This depends on the user's browser and OS.
In the case of Netscape with Windows OS, all the cookies are stored in a single
file called
cookies.txt
c:\Program Files\Netscape\Users\username\cookies.txt
In the case of IE,each cookie is stored in a separate file namely username@website.txt.
c:\Windows\Cookies\username@Website.txt
Q5.What can javascript programs do?
Ans: Generation of HTML pages on-the-fly without accessing the Web server.
The user can be given control over the browser like User input validation
Simple computations can be performed on the client's machine
The user's browser, OS, screen size, etc. can be detected
Date and Time Handling. Q6.How to set a HTML document's background color?
Ans: document.bgcolor property can be set to any appropriate color.
Q7.What is reason of the "Access is Denied" ?
Ans:The "Access Denied" error in any browser is due to the following reason.
A javascript in one window or frame is tries to access another window or frame
whose
document's domain is different from the document containing the script.
8.Is a javascript script faster than an ASP script?
Ans:Yes. Since javascript is a client-side script it does require the web server's
help for its
computation,so it is always faster than any server-side script like ASP,PHP,etc.
Q9.Are Java and JavaScript the Same?
Ans: No. java and javascript are two different languages.
Java is a powerful object - oriented programming language like C++,C whereas
Javascript is a
client-side scripting language with some limitations.
Q10.How to embed javascript in a web page?
Ans:javascript code can be embedded in a web page between
<script
langugage="javascript"></script> tags
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