JavaScript -stringverwysing
JavaScript Strings
'n JavaScript-string stoor 'n reeks karakters soos "John Doe".
'n String kan enige teks binne dubbele of enkel aanhalingstekens wees:
let carName1 = "Volvo XC60";
let carName2 = 'Volvo XC60';
Stringindekse is nulgebaseer:
Die eerste karakter is in posisie 0, die tweede in 1, ensovoorts.
Vir 'n tutoriaal oor Strings, lees ons JavaScript String Tutoriaal .
String eienskappe en metodes
Normaalweg kan stringe soos "John Doe" nie metodes of eienskappe hê nie, want dit is nie voorwerpe nie.
Maar met JavaScript is metodes en eienskappe ook vir stringe beskikbaar, want JavaScript behandel stringe as objekte wanneer metodes en eienskappe uitgevoer word.
JavaScript-stringmetodes
| Method | Description |
|---|---|
| charAt() | Returns the character at a specified index (position) |
| charCodeAt() | Returns the Unicode of the character at a specified index |
| concat() | Returns two or more joined strings |
| endsWith() | Returns if a string ends with a specified value |
| fromCharCode() | Returns Unicode values as characters |
| includes() | Returns if a string contains a specified value |
| indexOf() | Returns the index (position) of the first occurrence of a value in a string |
| lastIndexOf() | Returns the index (position) of the last occurrence of a value in a string |
| localeCompare() | Compares two strings in the current locale |
| match() | Searches a string for a value, or a regular expression, and returns the matches |
| repeat() | Returns a new string with a number of copies of a string |
| replace() | Searches a string for a value, or a regular expression, and returns a string where the values are replaced |
| search() | Searches a string for a value, or regular expression, and returns the index (position) of the match |
| slice() | Extracts a part of a string and returns a new string |
| split() | Splits a string into an array of substrings |
| startsWith() | Checks whether a string begins with specified characters |
| substr() | Extracts a number of characters from a string, from a start index (position) |
| substring() | Extracts characters from a string, between two specified indices (positions) |
| toLocaleLowerCase() | Returns a string converted to lowercase letters, using the host's locale |
| toLocaleUpperCase() | Returns a string converted to uppercase letters, using the host's locale |
| toLowerCase() | Returns a string converted to lowercase letters |
| toString() | Returns a string or a string object as a string |
| toUpperCase() | Returns a string converted to uppercase letters |
| trim() | Returns a string with removed whitespaces |
| valueOf() | Returns the primitive value of a string or a string object |
Let wel
Alle stringmetodes gee 'n nuwe waarde terug.
Hulle verander nie die oorspronklike veranderlike nie.
JavaScript-string eienskappe
| Property | Description |
|---|---|
| constructor | Returns the string's constructor function |
| length | Returns the length of a string |
| prototype | Allows you to add properties and methods to an object |
String HTML Wrapper Metodes
HTML-omhulmetodes gee 'n string terug wat binne 'n HTML-merker toegedraai is.
Dit is nie standaardmetodes nie, en werk dalk nie soos verwag nie.
| Method | Description |
|---|---|
| anchor() | Displays a string as an anchor |
| big() | Displays a string using a big font |
| blink() | Displays a blinking string |
| bold() | Displays a string in bold |
| fixed() | Displays a string using a fixed-pitch font |
| fontcolor() | Displays a string using a specified color |
| fontsize() | Displays a string using a specified size |
| italics() | Displays a string in italic |
| link() | Displays a string as a hyperlink |
| small() | Displays a string using a small font |
| strike() | Displays a string with a strikethrough |
| sub() | Displays a string as subscript text |
| sup() | Displays a string as superscript text |