Javascript This function can be used to write text, HTML, or both. Take a look at the following code. document.write ("Hello World!") This code will produce the following result: Hello World! Whitespace and Line Breaks JavaScript ignores spaces, tabs, and newlines that appear in JavaScript programs. You can use spaces, tabs, and newlines freely in your program and you are free to format and indent your programs in a neat and consistent way that makes the code easy to read and understand. Semicolons are Optional Simple statements in JavaScript are generally followed by a semicolon character, just as they are in C, C++, and Java. JavaScript, however, allows you to omit this semicolon if each of your statements are placed on a separate line. For example, the following code could be written without semicolons. 6
Javascript But when formatted in a single line as follows, you must use semicolons: Note: It is a good programming practice to use semicolons. Case Sensitivity JavaScript is a case-sensitive language. This means that the language keywords, variables, function names, and any other identifiers must always be typed with a consistent capitalization of letters. So the identifiers Time and TIME will convey different meanings in JavaScript. NOTE: Care should be taken while writing variable and function names in JavaScript. Comments in JavaScript JavaScript supports both C-style and C++-style comments. Thus: Any text between a // and the end of a line is treated as a comment and is ignored by JavaScript. Any text between the characters /* and */ is treated as a comment. This may span multiple lines. JavaScript also recognizes the HTML comment opening sequence is not recognized by JavaScript so it should be written as //-->. Example 7
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13. FUNCTIONS Javascript A function
Javascript Click the following butt
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Javascript Use different parameters
Javascript var variablename = funct
14. EVENTS Javascript What is an Ev
Javascript ....... onmouseove
Javascript ondragenter script Trigg
Javascript onplaying script Trigger
15. COOKIES Javascript What are Coo
Javascript Enter name: Outp
Javascript Setting Cookies Expiry D
Javascript Output Enter Cookie Na
Javascript Example Try the followin
Javascript setTimeout('Redirect()',
17. DIALOG BOX Javascript JavaScrip
Javascript Output Click the fol
18. VOID KEYWORD Javascript void is
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Javascript Output Book title is
Javascript User-defined objects /
Javascript In the following section
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Javascript Day of the Month must be
Javascript alert("Value of bigNumbe
Javascript constructor It returns a
Javascript Try the following exampl
Javascript document.write(""); docu
Javascript document.write("num.toPr
Javascript Returns the primitive va
Javascript Returns the function tha
Javascript Method toSource() toStri
Javascript Output flag.toString
23. STRING Javascript The String ob
Javascript Try the following exampl
Javascript concat() indexOf() lastI
Javascript document.writeln("str.ch
Javascript Argument Details string2
Javascript lastIndexOf () This meth
Javascript var index = str1.localeC
Javascript substring. $n or $nn Whe
Javascript Search () This method ex
Javascript document.write( sliced )
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Javascript Return Value Returns a s
Javascript JavaScript String toLow
Javascript var str = "Apples are r
Javascript were in a tag sup() Cau
Javascript blink () This method cau
Javascript Try the following exampl
Javascript JavaScript String font
Javascript JavaScript String link(
Javascript JavaScript String strik
Javascript JavaScript String sup(
Javascript input length prototype T
Javascript Prototype The prototype
Javascript push() reduce() reduceRi
Javascript every () Javascript arra
Javascript } var passed = [12, 5, 8
Javascript Array.prototype.filter =
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Javascript var len = this.length; v
Javascript join () Javascript array
Javascript var from = Number(argume
Javascript } var index = [12, 5, 8,
Javascript Array.prototype.map = fu
Javascript Its syntax is as follows
Javascript var rv = arguments[1]; }
Javascript } } throw new TypeError(
Javascript } rv = this[i--]; break;
Javascript } rv = fun.call(null, rv
Javascript Output Removed element
Javascript { } if (i in this && fun
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Javascript toString () Javascript a
25. DATE Javascript The Date object
Javascript Return Value Returns the
Javascript Date Methods Here is a l
Javascript universal time. setUTCMo
Javascript Syntax Its syntax is as
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Javascript var dt = new Date(); d
Javascript getMonth() : 11 getSecon
Javascript Syntax Its syntax is as
Javascript Try the following exampl
Javascript Output getUTCHours() :
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Javascript JavaScript getYear Met
Javascript JavaScript setFullYear
Javascript If you specify a number
Javascript monthValue : An integ
Javascript setTime () Javascript da
Javascript Date.setUTCFullYear(year
Javascript document.write( dt );
Javascript Try the following exampl
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Javascript var dt = new Date(1993,
Javascript toLocaleDateString () Ja
Javascript Syntax Its syntax is as
Javascript For instances of Date,
Javascript var dateobject = new
Javascript Output 743850547000 Date
Javascript minutes : An integer
Javascript In the following section
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Javascript Property Value is : 0.43
Javascript JavaScript Math SQRT2 P
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Javascript First Test Value : 3.141
Javascript JavaScript Math atan() M
Javascript var value = Math.atan2(+
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Javascript Output First Test Value
Javascript var value = Math.log(10
Javascript min ( ) This method retu
Javascript var value = Math.pow(7,
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Javascript Output First Test Val
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27. REGEXP Javascript A regular exp
Javascript Examples Following examp
Javascript m g Specifies that if th
Javascript Try the following exampl
Javascript Test1 - ignoreCase prope
Javascript if ( re.multiline ){ doc
Javascript exec ( ) The exec method
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Javascript forms[ ] 9 An array of F
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Javascript This is main title Click
Javascript createElement( tagName)
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Javascript Specifies the loading st
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30. FORM VALIDATION Javascript Form
Javascript Basic Form Validation Fi
Javascript var emailID = document.m
Javascript Manual Animation So let'
Javascript } function moveRight(){
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Javascript Output Checking for Plug
Javascript //--> If you
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34. IMAGE MAP Javascript You can us
Javascript Output You can feel the
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