qr code generator java download An Introduction to Advanced Techniques in Java

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An Introduction to Advanced Techniques
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C The cook property of the document object D The set_or_read_cookie property of the document object 12 Which property of the image object sets the source of an instance of the image object A width B height C img_width D src 13 In which type of script would you want to preload images on a page A Status bar text change B Rollover effect C Animating text D Disabling a right-click 14 Is it effective to try to hide the source code of a page using JavaScript A Of course! B Why not C No, but it can make reading it more difficult or annoying D Works every time! 15 Is JavaScript fun A Yes! B No! C I was forced to learn this by my boss, so it can never be fun! D What is your definition of fun
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Appendix
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Answers to Self Tests
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1: Introduction to JavaScript
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1 C HTML 2 A A Web browser 3 C JavaScript 4 B False 5 D lenient 6 A True 7 C LiveScript 8 A object based 9 B client 10 B It can validate the information before it is sent to the server 11 C scripting 12 A True 13 D The Web browser 14 D It is added to an HTML document 15 A <script> and </script> HTML tags
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2: Placing JavaScript in an HTML File
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1 D All of the above 2 B To be sure the browser does not interpret your JavaScript as another scripting language
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and to ensure the Web page validates in XHTML
3 A Yes 4 The noscript tag provides content for those without JavaScript 5 A js 6 B <script type= text/javascript src= yourfilejs ></script> 7 In older versions of HTML, the script tag is not case sensitive However, with XHTML, the
script tag must be in lowercase
8 D semicolon 9 A documentwrite() 10 C When the script is very long or needs to be placed in more than one HTML document
Appendix: Answers to Self Tests
11 JavaScript comments can be very useful for the purpose of documenting or debugging
your code
12 C // 13 A /* 14 D */ 15 A close
3: Using Variables
1 A variable represents or holds a value 2 A They can save you time in writing and updating your scripts, and they can make the
purpose of your code clearer
3 To declare a variable, you use the var keyword 4 D = 5 C var pagenumber=240; 6 B False 7 A variable name must begin with a letter or an underscore character 8 A True 9 B var my_house; 10 In JavaScript, the variable values, or types, can include numbers, strings, Booleans, and nulls 11 To denote an exponent in JavaScript, you use a letter e right after the base number and
before the exponent
12 C var mytext= Here is some text! ; 13 D documentwrite( John said, \ Hi!\ ); 14 Special characters enable you to add things to your strings that could not be added
otherwise
15 B documentwrite( I like to +myhobby+ every weekend );
4: Using Functions
1 In general, a function is a little script within a larger script that is used to perform a single
task or a series of tasks
2 B They provide a way to organize the various parts of the script into the different tasks that
must be accomplished, and they can be reused
JavaScript: A Beginner s Guide
3 On the first line of a function, you declare it as a function, name it, and indicate whether it
accepts any parameters
4 C function 5 A Curly brackets {} 6 A True 7 B False 8 C function get_text() 9 Parameters are used to allow a function to import one or more values from somewhere
outside the function
10 B parentheses () 11 D Comma 12 D windowalert( This is text ); 13 B some_alert( some , words ); 14 A var shopping=get_something(); 15 A local variable can be used only within the function in which it is declared
5: JavaScript Operators
1 A(n) operator is a symbol or word in JavaScript that performs some sort of calculation,
comparison, or assignment on one or more values
2 Mathematical operators are most often used to perform mathematical calculations on
two values
3 The addition operator adds two values 4 When the increment operator is placed before the operand, it increases the value of the
operand by 1, and then the rest of the statement is executed
5 D $# 6 A Assigns a new value to a variable 7 The add-and-assign (+=) operator adds the value on the right side of the operator to the
variable on the left side and then assigns to the variable that new value
8 C Compares two values or statements, and returns a value of true or false 9 A 4!=3 10 D 4<=3
Appendix: Answers to Self Tests
11 The logical operators allow you to compare two conditional statements to see if one or both
of the statements is true and to proceed accordingly
12 B !(17>=20) 13 B (4>=4)&&(5<=2) 14 Bitwise operators are logical operators that work at the bit level 15 In JavaScript, the operators have a certain order of precedence
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