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Stringa di Javascript
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La manipolazione di stringa è una parte importante di programmazione dello scritto del Java. L'oggetto della stringa è usato per maneggiare una parte memorizzata di testo e contiene 28 funzioni che possono essere usate per maneggiare la stringa.



Esempio: 1

Ciò è l'esempio per scoprire la lunghezza del testo

<script type="text/javascript">
var str="vyom technosoft"
document.write(str.toUpperCase())
</script>


Uscita

15


Esempio: 2

Ciò è un altro esempio per cambiare la maiuscola a lettera minuscula di testo.

<script type="text/javascript">
var txt="VYOM TECHNOSOFT"
document.write(str.toLowerCase())
</script>


Uscita

vyom technosoft


Proprietà:

Properties Description
length Returns the length of the string (# of characters).
prototype

Use this property to attach additional properties and/or methods that get reflected in all instances of the String.


Metodi:

Methods Description
anchor(name) Returns the string with the tag <A name="name"> surrounding it.
big() Returns the string with the tag <BIG> surrounding it.
blink() Returns the string with the tag <BLINK> surrounding it.
bold() Returns the string with the tag <B> surrounding it.
fixed() Returns the string with the tag <TT> surrounding it.
fontcolor(color) Returns the string with the tag <FONT color="color"> surrounding it. .
fontsize(size) Returns the string with the tag <FONT size="size"> surrounding it.
italics() Returns the string with the tag <I> surrounding it.
link(url) Returns the string with the tag <A href="url"> surrounding it.
small() Returns the string with the tag <SMALL> surrounding it.
strike() Returns the string with the tag <STRIKE> surrounding it.
sub() Returns the string with the tag <SUB> surrounding it.
sup() Returns the string with the tag <SUP> surrounding it.
charAt(x) Returns the character at the "x" position within the string.
charCodeAt(x)

Returns the Unicode value of the character at position "x" within the string.

concat(v1 v2...)

Combines one or more strings (arguments v1 v2 etc) into the existing one and returns the combined string. Original string is not modified.

fromCharCode(c1 c2...)

Returns a string created by using the specified sequence of Unicode values (arguments c1 c2 etc). Method of String object not String instance. For example: String.fromCharCode().

indexOf(substr [start])

Searches and (if found) returns the index number of the searched character or substring within the string. If not found -1 is returned. "Start" is an optional argument specifying the position within string to begin the search. Default is 0.

lastIndexOf(substr [start])

Searches and (if found) returns the index number of the searched character or substring within the string. Searches the string from end to beginning. If not found -1 is returned. "Start" is an optional argument specifying the position within string to begin the search. Default is string.length-1.

match(regexp)

Executes a search for a match within a string based on a regular expression. It returns an array of information or null if no match is found.

replace( regexp replacetext)

Searches and replaces the regular expression portion (match) with the replaced text instead.

search(regexp)

Tests for a match in a string. It returns the index of the match or -1 if not found.

slice(start [end])

Returns a substring of the string based on the "start" and "end" index arguments NOT including the "end" index itself. "End" is optional and if none is specified the slice includes all characters from "start" to end of string.

split(delimiter [limit])

Splits a string into many according to the specified delimiter and returns an array containing each element. The optional "limit" is an integer that lets you specify the maximum number of elements to return.

substr(start [length])

Returns the characters in a string beginning at "start" and through the specified number of characters "length". "Length" is optional and if omitted up to the end of the string is assumed.

substring(from [to])

Returns the characters in a string between "from" and "to" indexes NOT including "to" inself. "To" is optional and if omitted up to the end of the string is assumed.

toLowerCase()

Returns the string with all of its characters converted to lowercase.

toUpperCase()

Returns the string with all of its characters converted to uppercase.




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Keywords:javascript string functions javascript string length javascript string replace javascript string split javascript string compare javascript string trim javascript number to string javascript string object javascript string manipulation javascript string search


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