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Q:

What is the difference between "==" and "==="?

Answer

"==" checks equality only,
"===" checks for equality as well as the type.

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Subject: Web Technology

Q:

What does isNaN function do?

Answer

It Return true if the argument is not a number.

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Q:

What is mean by "this" keyword in javascript?

A) It refers current object B) It referes previous object
C) It is variable which contains value D) None of the above
 
Answer & Explanation Answer: A) It refers current object

Explanation:
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Q:

Which of the following navigator object properties is the same in both Netscape and IE?

A) navigator.appCodeName B) navigator.appName
C) navigator.appVersion D) None of the above
 
Answer & Explanation Answer: A) navigator.appCodeName

Explanation:
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Q:

Which class provides an interface for invoking JavaScript methods and examining JavaScript properties.

A) ScriptObject B) JSObject
C) JavaObject D) Jobject
 
Answer & Explanation Answer: B) JSObject

Explanation:
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Q:

The syntax of capture events method for document object is..

Answer

captureEvents(eventType)

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Q:

Which of the following is added to prefs.js,when open a dialog box each time an error occurs?

A) user_pref("javascript.classic.error_alerts", true); B) user_pref("javascript.classic.error_alerts ", false);
C) user_pref("javascript.console.open_on_error ", false); D) user_pref("javascript.console.open_on_error ", true);
 
Answer & Explanation Answer: A) user_pref("javascript.classic.error_alerts", true);

Explanation:
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Q:

How do you put a message in the browser's status bar ?

A) status("put your message here") B) window.status = "put your message here"
C) statusbar = "put your message here" D) window.status("put your message here")
 
Answer & Explanation Answer: B) window.status = "put your message here"

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