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Create a JavaScript Clock
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This project enables you to work more with the methods of the Date object, as well as learn how to adjust the values that are returned so they can be used in various ways This creates a JavaScript clock with a few more options than your simple clock in the previous section
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1 Create an HTML page with script tags that point to an external JavaScript file named
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prjs12_2js Add a heading that says Current Time and add a div element with an id of my_clock Save the HTML file as pr12_1html
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2 Create an external JavaScript file and save it as prjs12_2js Use it for steps 3 6
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3 Write some code that will display a clock In this clock, include the following information:
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The time with hours, minutes, and seconds Whether it is AM or PM The date in the form mm/dd/yyyy
4 This will be a 12-hour clock, so be sure to adjust the value of the hours so that they stay between
1 and 12 Also, note the format of the date and adjust the month and day values accordingly
5 Begin the clock, and have it update every second 6 Save the JavaScript file and open the HTML file in your browser The time and date should
appear on the page
Try This Summary
In this project, you used your knowledge of the Date object Using the methods of the Date object, you created a clock that appears on the Web page
12 Self Test
1 What do the properties and methods of the Math object enable you to do A Take the square roots and other such values of strings and return a number B Perform mathematical calculations C Go to math class to learn new theorems D Nothing, they are useless 2 The __________ property holds the value of Euler s constant 3 The LN10 property holds the value of the natural __________ of 10 4 The LOG10E property holds the value of the logarithm of 10*E A True B False 5 Which of the following would correctly write the value of pi on a Web page A documentwrite(MathPi); B documentwrite(Mathpi); C documentwrite(MathPI); D documentwrite(DatePI); 6 The __________ property holds the value of the square root of 2
JavaScript: A Beginner s Guide
7 The abs() method returns the __________ value of a number sent to it as a parameter A absent B absurd C absolute D absolute square root 8 The __________ method returns the arcsine of a number sent to it as a parameter 9 The pow() method returns the numeric value of the __________ parameter raised to the
power of the __________ parameter
10 Which of the following would correctly generate a random number between 0 and 7 A var rand_int= Mathfloor(Mathrandom()*7); B var rand_int= Mathfloor(Mathrandom()*6); C var rand_int= Mathfloor(Mathrandom()*8); D var rand_int= Mathsqrt(Mathrandom()); 11 The __________ method returns the square root of a number sent to it as a parameter 12 What must be created in most cases before the Date object s properties and methods
can be used
A Nights string B A number for reference to the date C A time for the date to be set D An instance of the Date object 13 The __________ method returns the number of days into the week 14 The getMonth() method returns the same number as the number that represents the current
month (for example, returns 1 if the current month is January)
A True B False 15 Which of the following correctly assigns the day of the week for an instance of the Date
object named rightnow to a variable named weekday
A var weekday= rightnowgetDate(); B var weekday= rightnowgetDay(); C var weekday= right nowgetDay(); D var weekly= rightlatergetMinutes();
Handling Strings
JavaScript: A Beginner s Guide
Key Skills & Concepts
Using the Properties of the String Object Using the Methods of the String Object Using Regular Expressions
o work with strings in JavaScript, you need to learn about the various methods that handle them The methods come from the JavaScript String object This chapter first explains what the String object is and how to create strings that use its properties and methods Then, the String object s properties and methods are discussed in more detail so you can see how they work Finally, you ll code a script that uses some of the properties and methods you ve learned
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