Java Script Interview Questions and Answers
JavaScript is a script language - a system of programming codes, created by Netscape, that can be embedded into the HTML of a web page to add functionality. JavaScript should not be confused with the Java programming language. In general, script languages such as JavaScript are easier and faster to code than more structured languages such as Java and C++.
JavaScript Interviews are getting tough these days as the technology grows faster. To get through the JavaScript interview one needs to update him/herself in a regular manner. Having said that, just before the interview, it is very important to have a quick glance of the reputed JavaScript questions and answers to make yourself comfortable during the interview process. This is where DoAnswers.com helps you in renewing yourself on JavaScript and various other technologies interview preparation.
11. How to set a HTML document's background color?
document.bgcolor property can be set to any appropriate color.
12. However , this can be done by coding a Java applet that reads files for the script. How to detect the operating system on the client machine?
In order to detect the operating system on the client machine, the navigator.appVersion string (property) should be used.
13. Is a javascript script faster than an ASP script?
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..
14. What are JavaScript types?
Number, String, Boolean, Function, Object, Null, Undefined.
15. What boolean operators does JavaScript support?
&&, || and !
16. What can javascript programs do?
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
17. What does "1"+2+4 evaluate to?
Since 1 is a string, everything is a string, so the result is 124.
18. What does isNaN function do?
Return true if the argument is not a number.
19. What does the "Access is Denied" IE error mean?
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.
20. What is a prompt box?
A prompt box allows the user to enter input by providing a text box.
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