JavaScript interview questions and answers

Click here to share knowledge by answering these questions What is JavaScript? What boolean operators does JavaScript support? Is a javascript script faster than an ASP script? What is === operator ? What is negative infinity?  What’s relationship between JavaScript and ECMAScript?  What does isNaN function do?  How to read and write a file using javascript?  How do you create a new object in JavaScript?  How to create arrays in JavaScript? How to set a HTML document's background color?  How do you assign object properties?  What looping structures are there in JavaScript?  What is this keyword? What is the difference between undefined value and null value? Where are cookies actually stored on the hard disk?  How do you submit a form using Javascript?  How to add a combo box dynamically at run time in Java script? What are undefined and undeclared variables? How to detect the operating system on the client machine?  How do you convert numbers between different bases in JavaScript?    Click here to share knowledge by answering these questions What is JavaScript? What boolean operators does JavaScript support? Is a javascript script faster than an ASP script? What is == operator ? What is negative infinity? What’s relationship between JavaScript and ECMAScript? What does isNaN function do? How to read and write a file using javascript? How do you create a new object in JavaScript? How to create arrays in JavaScript?