Sample Javascript Technical Interview Questions and Answers for freshers job interview / placement test. Javascript / Java Questions related to asked in written java script IT recruitment exams and interview.

What is Javascript?

Is there a way to hide the HTML source code from users?

How can we use javascript to submit an online form?

Where are the cookies stored on the computer?

What is the use of prompt box?

How is the client side javascript different from server side java script? Explain the difference with an example.

How can we open a particular frame using an hyperlink

Use of function constructor to make a function.

How can we use javascript to read and write a file?

What is the function of the delete operator?

How is the alert box different from a confirmation box?

What is the difference between javascript and ECMAScript?

What do you understand by an Undefined value?

Which function can be used in forms where we want to go to the next field only after filling a field.

How can we reject invalid email addresses using javascript in a form

Where can we find the official bug list?

List the basic entities in Javascript language.

Is there any similarity between javascript and C/C++ syntax?

Can we use a single variable name more than once in the code?

How do we use javascript to submit forms online or by email?

Can we use it to as a visitor counter?

Where do we use quotation marks in the code?

What are the different types of Javascript?

What method do we use to convert the number between different bases?

What is the use of the Isnan function?

What do you mean by negative infinity?

Which boolean operators are supported by Javascript?

What would be the value of “1″ +2+4?

What would be the value of 3+4+”7″?

Which looping structures are found in Javascript?

How can we make a new object?

How are properties assigned to an object?

How do we append a value to an array?

What is the function of the break and continue statements?

What is the use of === operator?

What do you understand by undefined and undeclared variables?

Is the concept level scope offered in Javascript?

What do you understand by variable typing?

How is undefined value different from null value?

How can we determine the type of operating system running on the client machine?

How can we set the background color of an HTML page?

What is the meaning of “access is denied” error in IE?

Does javascript execute faster than ASP script?

Is there any difference between java and javascript?

How can we put javascript in a page?

How can we hide the javascript code in the old browsers which don’t recognize it.

How do we comment in it?

What is the use of javascript null?

Which numeric constants represent maximum and minimum values?