JavaScript Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

JavaScript Interview Questions

Questions Answers Views Company eMail

what does javascript null mean?

964

How would you check if a variable is null/undefined?

959

How to get the contents of an input box using javascript?

1063

What is isnan in javascript?

1034

What does the delete operator do?

926

What does undefined value mean in javascript?

1091

How can you detect the client operating system using javascript?

1223

What is unobtrusive javascript? How to add behavior to an element using javascript?

965

Write a way by which you can do something on the close of the window ?

1094

How to get value from dropdown (select) control?

1054

How to hide javascript code from old browsers that dont run it?

1012

How to force a page to go to another page using javascript ?

890

What is strict mode in javascript?

1042

discuss scoping in javascript?

942

What is the concept of “functions as objects” and how does this affect variable scope?

913

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Un-Answered Questions { JavaScript }

What is a boolean search?

865

How to reload a page using JavaScript?

1184

What is scope chain in javascript?

979

How to test 404 page in QA

2494

Why typeof null is object?

991

Explain why "self" is needed instead of "this".

950

What is the similarity between the 1st and 2nd statement?

957

What is an immediately-invoked function expression?

896

List some features of javascript.

1607

What is output of “20” + 20? In javascript?

950

Expand BOM and explain it?

933

What is the meaning of callback function?

1063

How do I view javascript files in chrome?

906

Is it possible to use javascript to change the meta-tags of the page?

902

What is event in web programming?

915

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