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

JavaScript Interview Questions

Questions Answers Views Company eMail

What is the result of below given line of code in java script? 5+4+'7'?

950

How to set the focus in an element using javascript?

1093

What does "1"+2+3 evaluate to?

993

Name the datatypes of javascript?

1067

Difference between undefined and undeclared variables?

999

What is the difference of "settimeout" function and setinterval functions in javascript

1138

What are undefined and undeclared variables?

1009

How to determine the state of a checkbox using javascript?

1288

How to get checkbox status whether it is checked or not?

1000

How to get value from radiobuttonlist control?

1067

What are javascript closures?when would you use them?

986

Explain hoisting in javascript?

1094

Can you explain how inheritance works in javascript?

982

How about 3+5+"8"?

1036

To set all checkboxes to true using javascript?

1143

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Un-Answered Questions { JavaScript }

What is spread operator?

929

How to get checkbox status whether it is checked or not?

1000

Is javascript insecure?

1014

How to prevent modification of an object in Javascript?

1257

What is the difference between var and let?

994

Explain the difference between “==” and “===”?

1134

What is lazy loading in javascript?

1121

Who created npm?

966

What is difference between ajax and javascript?

1159

Can you explain the difference between == and ===?

1164

Explain unescape() and escape() in javascript?

997

Which companies are using node js?

936

What is the difference between innerhtml & innertext?

928

What is the difference between window and document in Javascript?

1117

How to get value of an element by class in javascript ?

1007

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