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JavaScript | MDN

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Beskrivning

JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, garbage-collected, dynamic language, supporting multiple paradigms such as imperative, functional, and object-oriented.

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Rubriker

H1 H2 H3 H4 H5 H6
1 5 3 0 0 0
  • [H1] JavaScript
  • [H2] In this article
  • [H2] Beginner's tutorials
  • [H2] JavaScript guides
  • [H2] Reference
  • [H2] Help improve MDN
  • [H3] Fundamental language guides
  • [H3] Intermediate
  • [H3] Advanced

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Anchor Typ Juice
Skip to main content Interna Passing Juice
Skip to search Interna Passing Juice
just-in-time compiled Interna Passing Juice
first-class functions Interna Passing Juice
many non-browser environments Externa Passing Juice
Node.js Interna Passing Juice
Apache CouchDB Externa Passing Juice
Adobe Acrobat Externa Passing Juice
prototype-based Interna Passing Juice
garbage-collected Interna Passing Juice
dynamic Interna Passing Juice
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Java programming language Externa Passing Juice
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JavaScript guide Interna Passing Juice
JavaScript reference Interna Passing Juice
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JavaScript guides Interna Passing Juice
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learn web development core modules Interna Passing Juice
Your first website: Adding interactivity Interna Passing Juice
Dynamic scripting with JavaScript Interna Passing Juice
JavaScript frameworks and libraries Interna Passing Juice
Fundamental language guides Interna Passing Juice
Intermediate Interna Passing Juice
Advanced JavaScript objects Interna Passing Juice
Asynchronous JavaScript Interna Passing Juice
asynchronous Interna Passing Juice
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JavaScript language overview Interna Passing Juice
JavaScript data structures Interna Passing Juice
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Advanced Interna Passing Juice
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MDN contributors Interna Passing Juice
JavaScript Interna Passing Juice
Introduction Interna Passing Juice
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Backreference: \1, \2 Interna Passing Juice
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Character class escape: \d, \D, \w, \W, \s, \S Interna Passing Juice
Character class: [...], [^...] Interna Passing Juice
Character escape: \n, \u{...} Interna Passing Juice
Disjunction: | Interna Passing Juice
Input boundary assertion: ^, $ Interna Passing Juice
Literal character: a, b Interna Passing Juice
Lookahead assertion: (?=...), (?!...) Interna Passing Juice
Lookbehind assertion: (?<=...), (?<!...) Interna Passing Juice
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Quantifier: *, +, ?, {n}, {n,}, {n,m} Interna Passing Juice
Unicode character class escape: \p{...}, \P{...} Interna Passing Juice
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Word boundary assertion: \b, \B Interna Passing Juice
Errors Interna Passing Juice
AggregateError: No Promise in Promise.any was resolved Interna Passing Juice
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InternalError: too much recursion Interna Passing Juice
RangeError: argument is not a valid code point Interna Passing Juice
RangeError: BigInt division by zero Interna Passing Juice
RangeError: BigInt negative exponent Interna Passing Juice
RangeError: form must be one of 'NFC', 'NFD', 'NFKC', or 'NFKD' Interna Passing Juice
RangeError: invalid array length Interna Passing Juice
RangeError: invalid date Interna Passing Juice
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RangeError: repeat count must be less than infinity Interna Passing Juice
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RangeError: x can't be converted to BigInt because it isn't an integer Interna Passing Juice
ReferenceError: "x" is not defined Interna Passing Juice
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ReferenceError: can't access lexical declaration 'X' before initialization Interna Passing Juice
ReferenceError: must call super constructor before using 'this' in derived class constructor Interna Passing Juice
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SyntaxError: applying the 'delete' operator to an unqualified name is deprecated Interna Passing Juice
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SyntaxError: await is only valid in async functions, async generators and modules Interna Passing Juice
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SyntaxError: continue must be inside loop Interna Passing Juice
SyntaxError: duplicate capture group name in regular expression Interna Passing Juice
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SyntaxError: for-in loop head declarations may not have initializers Interna Passing Juice
SyntaxError: function statement requires a name Interna Passing Juice
SyntaxError: functions cannot be labelled Interna Passing Juice
SyntaxError: getter and setter for private name #x should either be both static or non-static Interna Passing Juice
SyntaxError: getter functions must have no arguments Interna Passing Juice
SyntaxError: identifier starts immediately after numeric literal Interna Passing Juice
SyntaxError: illegal character Interna Passing Juice
SyntaxError: import declarations may only appear at top level of a module Interna Passing Juice
SyntaxError: incomplete quantifier in regular expression Interna Passing Juice
SyntaxError: invalid assignment left-hand side Interna Passing Juice
SyntaxError: invalid BigInt syntax Interna Passing Juice
SyntaxError: invalid capture group name in regular expression Interna Passing Juice
SyntaxError: invalid character in class in regular expression Interna Passing Juice
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SyntaxError: invalid decimal escape in regular expression Interna Passing Juice
SyntaxError: invalid identity escape in regular expression Interna Passing Juice
SyntaxError: invalid named capture reference in regular expression Interna Passing Juice
SyntaxError: invalid property name in regular expression Interna Passing Juice
SyntaxError: invalid range in character class Interna Passing Juice
SyntaxError: invalid regexp group Interna Passing Juice
SyntaxError: invalid regular expression flag "x" Interna Passing Juice
SyntaxError: invalid unicode escape in regular expression Interna Passing Juice
SyntaxError: JSON.parse: bad parsing Interna Passing Juice
SyntaxError: label not found Interna Passing Juice
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SyntaxError: missing formal parameter Interna Passing Juice
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SyntaxError: negated character class with strings in regular expression Interna Passing Juice
SyntaxError: new keyword cannot be used with an optional chain Interna Passing Juice
SyntaxError: nothing to repeat Interna Passing Juice
SyntaxError: numbers out of order in {} quantifier. Interna Passing Juice
SyntaxError: octal escape sequences can't be used in untagged template literals or in strict mode code Interna Passing Juice
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SyntaxError: private fields can't be deleted Interna Passing Juice
SyntaxError: property name __proto__ appears more than once in object literal Interna Passing Juice
SyntaxError: raw bracket is not allowed in regular expression with unicode flag Interna Passing Juice
SyntaxError: redeclaration of formal parameter "x" Interna Passing Juice
SyntaxError: reference to undeclared private field or method #x Interna Passing Juice
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SyntaxError: return not in function Interna Passing Juice
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SyntaxError: string literal contains an unescaped line break Interna Passing Juice
SyntaxError: super() is only valid in derived class constructors Interna Passing Juice
SyntaxError: tagged template cannot be used with optional chain Interna Passing Juice
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SyntaxError: Unexpected token Interna Passing Juice
SyntaxError: unlabeled break must be inside loop or switch Interna Passing Juice
SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**' Interna Passing Juice
SyntaxError: use of super property/member accesses only valid within methods or eval code within methods Interna Passing Juice
SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead Interna Passing Juice
TypeError: 'caller', 'callee', and 'arguments' properties may not be accessed Interna Passing Juice
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TypeError: "x" is not a non-null object Interna Passing Juice
TypeError: "x" is read-only Interna Passing Juice
TypeError: already executing generator Interna Passing Juice
TypeError: BigInt value can't be serialized in JSON Interna Passing Juice
TypeError: calling a builtin X constructor without new is forbidden Interna Passing Juice
TypeError: can't access/set private field or method: object is not the right class Interna Passing Juice
TypeError: can't assign to property "x" on "y": not an object Interna Passing Juice
TypeError: can't convert BigInt to number Interna Passing Juice
TypeError: can't convert x to BigInt Interna Passing Juice
TypeError: can't define property "x": "obj" is not extensible Interna Passing Juice
TypeError: can't delete non-configurable array element Interna Passing Juice
TypeError: can't redefine non-configurable property "x" Interna Passing Juice
TypeError: can't set prototype of this object Interna Passing Juice
TypeError: can't set prototype: it would cause a prototype chain cycle Interna Passing Juice
TypeError: cannot use 'in' operator to search for 'x' in 'y' Interna Passing Juice
TypeError: class constructors must be invoked with 'new' Interna Passing Juice
TypeError: cyclic object value Interna Passing Juice
TypeError: derived class constructor returned invalid value x Interna Passing Juice
TypeError: getting private setter-only property Interna Passing Juice
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TypeError: invalid 'instanceof' operand 'x' Interna Passing Juice
TypeError: invalid Array.prototype.sort argument Interna Passing Juice
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TypeError: setting getter-only property "x" Interna Passing Juice
TypeError: WeakSet key/WeakMap value 'x' must be an object or an unregistered symbol Interna Passing Juice
TypeError: X.prototype.y called on incompatible type Interna Passing Juice
URIError: malformed URI sequence Interna Passing Juice
Warning: -file- is being assigned a //# sourceMappingURL, but already has one Interna Passing Juice
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SEO Nyckelord

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class assignment javascript regular expression object invalid typeerror syntaxerror function

Nyckelord Konsistens

Nyckelord Innehåll Titel Nyckelord Beskrivning Rubriker
syntaxerror 73
javascript 44
typeerror 38
expression 22
class 19

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