js_tutorial

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Javascript Within the body of a function, a local variable takes precedence over a global variable with the same name. If you declare a local variable or function parameter with the same name as a global variable, you effectively hide the global variable. Take a look into the following example. var myVar = "local"; // Declare a local variable document.write(myVar); It will produce the following result: Local JavaScript Variable Names While naming your variables in JavaScript, keep the following rules in mind. You should not use any of the JavaScript reserved keywords as a variable name. These keywords are mentioned in the next section. For example, break or boolean variable names are not valid. JavaScript variable names should not start with a numeral (0-9). They must begin with a letter or an underscore character. For example, 123test is an invalid variable name but _123test is a valid one. JavaScript variable names are case-sensitive. For example, Name and name are two different variables. 18
Javascript JavaScript Reserved Words A list of all the reserved words in JavaScript are given in the following table. They cannot be used as JavaScript variables, functions, methods, loop labels, or any object names. abstract else Instanceof switch boolean enum int synchronized break export interface this byte extends long throw case false native throws catch final new transient char finally null true class float package try const for private typeof continue function protected var debugger goto public void default if return volatile delete implements short while do import static with double in super 19
Page 2 and 3: About the Tutorial JavaScript is a
Page 4 and 5: Bitwise Operators .................
Page 6 and 7: 23. String ........................
Page 8 and 9: setUTCDate () .....................
Page 10 and 11: Checking for Plug-Ins .............
Page 12 and 13: 1. OVERVIEW Javascript What is Java
Page 14 and 15: Javascript components, integrates w
Page 16 and 17: Javascript This function can be use
Page 18 and 19: Javascript The following example sh
Page 20 and 21: Javascript JavaScript in Chrome Her
Page 22 and 23: 4. PLACEMENT Javascript There is a
Page 24 and 25: Javascript This code will
Page 26 and 27: 5. VARIABLES Javascript JavaScript
Page 30 and 31: 6. OPERATORS Javascript What is an
Page 32 and 33: Javascript document.write("a - b =
Page 34 and 35: Javascript the right operand, if ye
Page 36 and 37: Javascript Output (a == b) => false
Page 38 and 39: Javascript Output (a && b) => fal
Page 40 and 41: Javascript document.write("(a | b)
Page 42 and 43: Javascript Ex: C /= A is equivalent
Page 44 and 45: Javascript Set the variables to dif
Page 46 and 47: Javascript Function Undefined Null
Page 48 and 49: 7. IF-ELSE Javascript While writing
Page 50 and 51: Javascript Output Qualifies for dri
Page 52 and 53: Javascript Try the following code t
Page 54 and 55: Javascript Syntax The objective of
Page 56 and 57: Javascript switch (grade) { case 'A
Page 58 and 59: Javascript Syntax The syntax of whi
Page 60 and 61: Javascript do{ Statement(s) to be e
Page 62 and 63: 10. FOR LOOP Javascript The for Loo
Page 64 and 65: Javascript Current Count : 6 Curren
Page 66 and 67: Javascript Set the variable to diff
Page 68 and 69: Javascript Set the variable to
Page 70 and 71: Javascript Entering the loop 2 3 4
Page 72 and 73: Javascript Output Entering th
Page 74 and 75: 13. FUNCTIONS Javascript A function
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Javascript Click the following but
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Javascript Use different parameters
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Javascript var variablename = funct
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14. EVENTS Javascript What is an Ev
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Javascript ....... onmouseove
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Javascript ondragenter script Trigg
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Javascript onplaying script Trigger
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15. COOKIES Javascript What are Coo
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Javascript Enter name: Outp
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Javascript Setting Cookies Expiry D
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Javascript Output Enter Cookie Na
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Javascript Example Try the followin
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Javascript setTimeout('Redirect()',
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17. DIALOG BOX Javascript JavaScrip
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Javascript Output Click the fol
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18. VOID KEYWORD Javascript void is
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Javascript Click the followin
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Javascript 2. If you do not want to
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Javascript 104
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Javascript Methods are useful for e
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Javascript Output Book title is
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Javascript User-defined objects /
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Javascript In the following section
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Javascript Click the following t
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Javascript Day of the Month must be
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Javascript alert("Value of bigNumbe
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Javascript constructor It returns a
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Javascript Try the following exampl
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Javascript document.write(""); docu
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Javascript document.write("num.toPr
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Javascript Returns the primitive va
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Javascript Returns the function tha
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Javascript Method toSource() toStri
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Javascript Output flag.toString
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23. STRING Javascript The String ob
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Javascript concat() indexOf() lastI
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Javascript document.writeln("str.ch
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Javascript Argument Details string2
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Javascript lastIndexOf () This meth
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Javascript var index = str1.localeC
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Javascript substring. $n or $nn Whe
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Javascript Search () This method ex
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Javascript document.write( sliced )
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Javascript Return Value Returns a s
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Javascript JavaScript String toLow
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Javascript var str = "Apples are r
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Javascript were in a tag sup() Cau
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Javascript blink () This method cau
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Javascript JavaScript String font
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Javascript JavaScript String link(
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Javascript JavaScript String strik
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Javascript JavaScript String sup(
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Javascript input length prototype T
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Javascript Prototype The prototype
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Javascript push() reduce() reduceRi
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Javascript every () Javascript arra
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Javascript } var passed = [12, 5, 8
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Javascript Array.prototype.filter =
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Javascript } }; Example Try the fol
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Javascript var len = this.length; v
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Javascript join () Javascript array
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Javascript var from = Number(argume
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Javascript } var index = [12, 5, 8,
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Javascript Array.prototype.map = fu
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Javascript Its syntax is as follows
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Javascript var rv = arguments[1]; }
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Javascript } } throw new TypeError(
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Javascript } rv = this[i--]; break;
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Javascript } rv = fun.call(null, rv
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Javascript Output Removed element
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Javascript { } if (i in this && fun
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Javascript Return Value Returns a s
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Javascript toString () Javascript a
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25. DATE Javascript The Date object
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Javascript Return Value Returns the
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Javascript Date Methods Here is a l
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Javascript universal time. setUTCMo
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Javascript Syntax Its syntax is as
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Javascript var dt = new Date(); d
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Javascript getMonth() : 11 getSecon
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Javascript Output getUTCHours() :
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Javascript JavaScript getYear Met
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Javascript JavaScript setFullYear
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Javascript If you specify a number
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Javascript monthValue : An integ
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Javascript setTime () Javascript da
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Javascript Date.setUTCFullYear(year
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Javascript document.write( dt );
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Javascript var dt = new Date(1993,
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Javascript toLocaleDateString () Ja
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Javascript For instances of Date,
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Javascript var dateobject = new
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Javascript Output 743850547000 Date
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Javascript minutes : An integer
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Javascript In the following section
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Javascript Property Value is : 0.43
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Javascript JavaScript Math SQRT2 P
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Javascript First Test Value : 3.141
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Javascript JavaScript Math atan() M
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Javascript var value = Math.atan2(+
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Javascript Output First Test Value
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Javascript var value = Math.log(10
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Javascript min ( ) This method retu
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Javascript var value = Math.pow(7,
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Javascript Return Value Returns the
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Javascript Output First Test Val
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27. REGEXP Javascript A regular exp
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Javascript Examples Following examp
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Javascript m g Specifies that if th
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Javascript Test1 - ignoreCase prope
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Javascript if ( re.multiline ){ doc
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Javascript exec ( ) The exec method
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Javascript document.write("Test 2 -
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Javascript document.write("Test 1 -
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Javascript There are several DOMs i
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Javascript forms[ ] 9 An array of F
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Javascript Ex: document.close( ) op
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Javascript This is main title Click
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Javascript createElement( tagName)
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Javascript NOTE: This example r
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Javascript Specifies the loading st
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Javascript NOTE: This example
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Javascript Part 3: JavaScript Advan
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Javascript Logical Errors Logic err
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Javascript Now let us try to catch
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Javascript Output Click the followi
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Javascript Click the following to s
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30. FORM VALIDATION Javascript Form
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Javascript Basic Form Validation Fi
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Javascript var emailID = document.m
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Javascript Manual Animation So let'
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Javascript } function moveRight(){
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Javascript It is not possible to s
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Javascript Output Checking for Plug
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Javascript //--> If you
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Javascript Error Messages in Firefo
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Javascript Use a JavaScript Debugge
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34. IMAGE MAP Javascript You can us
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Javascript Output You can feel the
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Javascript 6 plugins[] This propert
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Javascript document.write(" Browser
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