1. What does the noscript tag do?
A. Enclose text to be displayed by non-JavaScript browsers.
B. Prevents scripts on the page from executing.
C. Describes certain low-budget movies.
D. None of the above
2. If para1 is the DOM object for a paragraph, what is the correct syntax to change the text within the paragraph?
A. "New Text"?
B. para1.value="New Text";
C. para1.firstChild.nodeValue= "New Text";
D. para1.nodeValue="New Text";
3. JavaScript entities start with _______ and end with _________.
A. Semicolon, colon
B. Semicolon, Ampersand
C. Ampersand, colon
D. Ampersand, semicolon
4. Which of the following best describes JavaScript?
A. a low-level programming language.
B. a scripting language precompiled in the browser.
C. a compiled scripting language.
D. an object-oriented scripting language.
5. Choose the server-side JavaScript object?
A. FileUpLoad
B. Function
C. File
D. Date
6. Choose the client-side JavaScript object?
A. Database
B. Cursor
C. Client
D. FileUpLoad
7. Which of the following is not considered a JavaScript operator?
A. new
B. this
C. delete
D. typeof
8. ______method evaluates a string of JavaScript code in the context of the specified object.
A. Eval
B. ParseInt
C. ParseFloat
D. Efloat
9. The syntax of close method for document object is ______________
A. Close(doc)
B. Close(object)
C. Close(val)
D. Close()
10. The syntax of Eval is ________________
A. [objectName.]eval(numeric)
B. [objectName.]eval(string)
C. [EvalName.]eval(string)
D. [EvalName.]eval(numeric)
11. JavaScript is interpreted by _________
A. Client
B. Server
C. Object
D. None of the above
12. Using _______ statement is how you test for a specific condition.
A. Select
B. If
C. Switch
D. For
13. Which of the following is the structure of an if statement?
A. if (conditional expression is true) thenexecute this codeend if
B. if (conditional expression is true)execute this codeend if
C. if (conditional expression is true) {then execute this code>->}
D. if (conditional expression is true) then {execute this code}
14. How to create a Date object in JavaScript?
A. dateObjectName = new Date([parameters])
B. dateObjectName.new Date([parameters])
C. dateObjectName := new Date([parameters])
D. dateObjectName Date([parameters])
15. The _______ method of an Array object adds and/or removes elements from an array.
A. Reverse
B. Shift
C. Slice
D. Splice
16. To set up the window to capture all Click events, we use which of the following statement?
A. window.captureEvents(Event.CLICK);
B. window.handleEvents (Event.CLICK);
C. window.routeEvents(Event.CLICK );
D. window.raiseEvents(Event.CLICK );
17. Which tag(s) can handle mouse events in Netscape?
A.
B.
C.
D. None of the above
18. ____________ is the tainted property of a window object.
A. Pathname
B. Protocol
C. Defaultstatus
D. Host
19. To enable data tainting, the end user sets the _________ environment variable.
A. ENABLE_TAINT
B. MS_ENABLE_TAINT
C. NS_ENABLE_TAINT
D. ENABLE_TAINT_NS
20. In JavaScript, _________ is an object of the target language data type that encloses an object of the source language.
A. a wrapper
B. a link
C. a cursor
D. a form
21. When a JavaScript object is sent to Java, the runtime engine creates a Java wrapper of type ___________
A. ScriptObject
B. JSObject
C. JavaObject
D. Jobject
22. _______ class provides an interface for invoking JavaScript methods and examining JavaScript properties.
A. ScriptObject
B. JSObject
C. JavaObject
D. Jobject
23. _________ is a wrapped Java array, accessed from within JavaScript code.
A. JavaArray
B. JavaClass
C. JavaObject
D. JavaPackage
24. A ________ object is a reference to one of the classes in a Java package, such as netscape.javascript .
A. JavaArray
B. JavaClass
C. JavaObject
D. JavaPackage
25. The JavaScript exception is available to the Java code as an instance of __________
A. netscape.javascript.JSObject
B. netscape.javascript.JSException
C. netscape.plugin.JSException
D. None of the above
26. To automatically open the console when a JavaScript error occurs which of the following is added to prefs.js?
A. user_pref(" javascript.console.open_on_error", false);
B. user_pref("javascript.console.open_error ", true);
C. user_pref("javascript.console.open_error ", false);
D. user_pref("javascript.console.open_on_error", true);
27. To open a dialog box each time an error occurs, which of the following is added to prefs.js?
A. user_pref("javascript.classic.error_alerts", true);
B. user_pref("javascript.classic.error_alerts ", false);
C. user_pref("javascript.console.open_on_error ", true);
D. user_pref("javascript.console.open_on_error ", false);
28. The syntax of a blur method in a button object is ______________
A. Blur()
B. Blur(contrast)
C. Blur(value)
D. Blur(depth)
29. The syntax of capture events method for document object is ______________
A. captureEvents()
B. captureEvents(args eventType)
C. captureEvents(eventType)
D. captureEvents(eventVal)
1. Why so JavaScript and Java have similar name?
A. JavaScript is a stripped-down version of Java
B. JavaScript's syntax is loosely based on Java's
C. They both originated on the island of Java
D. None of the above
2. When a user views a page containing a JavaScript program, which machine actually executes the script?
A. The User's machine running a Web browser
B. The Web server
C. A central machine deep within Netscape's corporate offices
D. None of the above
3. ______ JavaScript is also called client-side JavaScript.
A. Microsoft
B. Navigator
C. LiveWire
D. Native
4. __________ JavaScript is also called server-side JavaScript.
A. Microsoft
B. Navigator
C. LiveWire
D. Native
5. What are variables used for in JavaScript Programs?
A. Storing numbers, dates, or other values
B. Varying randomly
C. Causing high-school algebra flashbacks
D. None of the above
6. _____ JavaScript statements embedded in an HTML page can respond to user events such as mouse-clicks, form input, and page navigation.
A. Client-side
B. Server-side
C. Local
D. Native
7. What should appear at the very end of your JavaScript?
The
B. The
D.
16. Inside which HTML element do we put the JavaScript?
A.
B.
C.
D.
17. What is the correct syntax for referring to an external script called " abc.js"?
A.
B.
C.
D. None of the above
18. Which types of image maps can be used with JavaScript?
A. Server-side image maps
B. Client-side image maps
C. Server-side image maps and Client-side image maps
D. None of the above
19. 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
20. Which is the correct way to write a JavaScript array?
A. var txt = new Array(1:"tim",2:"kim",3:"jim")
B. var txt = new Array:1=("tim")2=("kim")3=(
C. var txt = new Array("tim","kim","jim")
D. var txt = new Array="tim","kim","jim"
- What’s relationship between JavaScript and ECMAScript? - ECMAScript is yet another name for JavaScript (other names include LiveScript). The current JavaScript that you see supported in browsers is ECMAScript revision 3.
- What are JavaScript types? - Number, String, Boolean, Function, Object, Null, Undefined.
- How do you convert numbers between different bases in JavaScript? - Use the parseInt() function, that takes a string as the first parameter, and the base as a second parameter. So to convert hexadecimal 3F to decimal, use parseInt ("3F", 16);
- What does isNaN function do? - Return true if the argument is not a number.
- What is negative infinity? - It’s a number in JavaScript, derived by dividing negative number by zero.
- What boolean operators does JavaScript support? - &&, || and !
- What does "1"+2+4 evaluate to? - Since 1 is a string, everything is a string, so the result is 124.
- How about 2+5+"8"? - Since 2 and 5 are integers, this is number arithmetic, since 8 is a string, it’s concatenation, so 78 is the result.
- What looping structures are there in JavaScript? - for, while, do-while loops, but no foreach.
- How do you create a new object in JavaScript? - var obj = new Object(); or var obj = {};
- How do you assign object properties? - obj["age"] = 17 or obj.age = 17.
- What’s a way to append a value to an array? - arr[arr.length] = value;
- What is this keyword? - It refers to the current object.