Novità in JavaScript 1.8.5

The following is a changelog for JavaScript 1.8.5. This version was included in Firefox 4.

Nuove funzionalità in JavaScript 1.8.5

Nuove funzioni

Funzioni Descrizione
Object.create() Crea un nuovo oggetto con l'oggetto prototipo specificato e le proprietà. bug 492840
Object.defineProperty() Aggiunge la proprietà denominata descritta da un determinato descrittore a un oggetto.
Object.defineProperties() Aggiunge le proprietà nominate descritte dai descrittori dati ad un oggetto.
Object.getOwnPropertyDescriptor() Restituisce un descrittore di proprietà per una proprietà denominata su un oggetto. bug 505587
Object.keys() Restituisce una matrice di tutte le proprietà enumerabili su un oggetto. bug 307791
Object.getOwnPropertyNames() Restituisce una matrice di tutte le proprietà enumerabili e non enumerabili su un oggetto. bug 518663
Object.preventExtensions() Impedisce qualsiasi estensione di un oggetto. bug 492849
Object.isExtensible() Determina se l'estensione di un oggetto è consentita. bug 492849
Object.seal() Impedisce l'altro codice dall'eliminazione delle proprietà di un oggetto. bug 492845
Object.isSealed() Determina se un oggetto è sigillato. bug 492845
Object.freeze() Blocca un oggetto: l'altro codice non può eliminare o modificare alcuna proprietà. bug 492844
Object.isFrozen() Determina se un oggetto è stato congelato. bug 492844
Array.isArray() Controlla se una variabile è un array. bug 510537
Date.prototype.toJSON() Restituisce una stringa di formato JSON per un oggetto Date.
Function.prototype.bind() Crea una nuova funzione che, quando chiamata, chiama questa funzione nel contesto fornito (con una determinata sequenza di argomenti) bug 429507

Nuove funzionalità ECMAScript5

Altri lavori di standardizzazione

Varie sintassi non standard per la definizione di getter e setter sono state rimosse; La sintassi definita da ECMAScript 5 non è stata modificata. Erano tutti piuttosto esoterici e raramente usati; se questo ti colpisce, vedi questo post sul blog per i dettagli.

Nuovi oggetti

Oggetti Descrizione
Old Proxy API Offre supporto per la creazione di proxy Object e Function che abilitano la meta-programmazione in JavaScript.

Funzionalità modificata in JavaScript 1.8.5

Argomenti correlati
  1. JavaScript
  2. Tutorials:
  3. Complete beginners
    1. JavaScript basics
    2. JavaScript first steps
    3. JavaScript building blocks
    4. Introducing JavaScript objects
  4. JavaScript Guide
    1. Introduction
    2. Grammar and types
    3. Control flow and error handling
    4. Loops and iteration
    5. Functions
    6. Expressions and operators
    7. Numbers and dates
    8. Text formatting
    9. Regular expressions
    10. Indexed collections
    11. Keyed collections
    12. Working with objects
    13. Details of the object model
    14. Using promises
    15. Iterators and generators
    16. Meta programming
  5. Intermediate
    1. Introducing JavaScript objects
    2. Client-side web APIs
    3. A re-introduction to JavaScript
    4. JavaScript data structures
    5. Equality comparisons and sameness
    6. Closures
  6. Advanced
    1. Inheritance and the prototype chain
    2. Strict mode
    3. JavaScript typed arrays
    4. Memory Management
    5. Concurrency model and Event Loop
  7. References:
  8. Built-in objects
    1. Array
    2. ArrayBuffer
    3. AsyncFunction [Translate]
    4. Atomics
    5. BigInt [Translate]
    6. Boolean
    7. DataView [Translate]
    8. Date [Translate]
    9. Error [Translate]
    10. EvalError [Translate]
    11. Float32Array [Translate]
    12. Float64Array [Translate]
    13. Function
    14. Generator
    15. GeneratorFunction [Translate]
    16. Infinity
    17. Int16Array [Translate]
    18. Int32Array [Translate]
    19. Int8Array [Translate]
    20. InternalError [Translate]
    21. Intl [Translate]
    22. Intl.Collator [Translate]
    23. Intl.DateTimeFormat [Translate]
    24. Intl.ListFormat [Translate]
    25. Intl.NumberFormat [Translate]
    26. Intl.PluralRules [Translate]
    27. Intl.RelativeTimeFormat [Translate]
    28. JSON
    29. Map
    30. Math
    31. NaN
    32. Number [Translate]
    33. Object
    34. Promise
    35. Proxy
    36. RangeError [Translate]
    37. ReferenceError [Translate]
    38. Reflect [Translate]
    39. RegExp [Translate]
    40. Set
    41. SharedArrayBuffer [Translate]
    42. String
    43. Symbol
    44. SyntaxError [Translate]
    45. TypeError [Translate]
    46. TypedArray [Translate]
    47. URIError [Translate]
    48. Uint16Array [Translate]
    49. Uint32Array [Translate]
    50. Uint8Array [Translate]
    51. Uint8ClampedArray [Translate]
    52. WeakMap [Translate]
    53. WeakSet [Translate]
    54. WebAssembly [Translate]
    55. decodeURI()
    56. decodeURIComponent()
    57. encodeURI()
    58. encodeURIComponent()
    59. escape()
    60. eval()
    61. isFinite()
    62. isNaN()
    63. null
    64. parseFloat()
    65. parseInt()
    66. undefined
    67. unescape()
    68. uneval()
  9. Expressions & operators
    1. Operatori Aritmetici
    2. Array comprehensions [Translate]
    3. Assignment operators [Translate]
    4. Operatori binari
    5. Comma operator [Translate]
    6. Comparison operators [Translate]
    7. Operatore condizionale (ternary)
    8. Assegnamento di destrutturazione
    9. Expression closures [Translate]
    10. Generator comprehensions [Translate]
    11. Grouping operator [Translate]
    12. Legacy generator function expression [Translate]
    13. Logical operators [Translate]
    14. Object initializer [Translate]
    15. Operator precedence [Translate]
    16. Pipeline operator [Translate]
    17. Property accessors [Translate]
    18. Spread syntax
    19. async function expression [Translate]
    20. await [Translate]
    21. class expression [Translate]
    22. delete operator [Translate]
    23. function expression [Translate]
    24. function* expression [Translate]
    25. operatore in
    26. instanceof [Translate]
    27. operatore new
    28. new.target [Translate]
    29. super
    30. this
    31. typeof [Translate]
    32. void operator [Translate]
    33. yield
    34. yield* [Translate]
  10. Statements & declarations
    1. Legacy generator function [Translate]
    2. async function [Translate]
    3. block [Translate]
    4. break [Translate]
    5. class [Translate]
    6. const [Translate]
    7. continue [Translate]
    8. debugger [Translate]
    9. default [Translate]
    10. do...while [Translate]
    11. empty [Translate]
    12. export
    13. for [Translate]
    14. for await...of [Translate]
    15. for each...in [Translate]
    16. for...in [Translate]
    17. for...of
    18. Dichiarazione di funzioni
    19. function*
    20. if...else [Translate]
    21. import
    22. import.meta [Translate]
    23. label [Translate]
    24. let
    25. return [Translate]
    26. switch
    27. throw
    28. try...catch [Translate]
    29. var
    30. while [Translate]
    31. with [Translate]
  11. Functions
    1. Funzioni a freccia
    2. Default parameters [Translate]
    3. Method definitions [Translate]
    4. Rest parameters
    5. Oggetto 'arguments'
    6. getter
    7. setter
  12. Classes
    1. costruttore
    2. extends
    3. static
  13. Errors
    1. Error: Permission denied to access property "x" [Translate]
    2. InternalError: too much recursion [Translate]
    3. RangeError: argument is not a valid code point [Translate]
    4. RangeError: invalid array length
    5. RangeError: invalid date [Translate]
    6. RangeError: precision is out of range [Translate]
    7. RangeError: radix must be an integer [Translate]
    8. RangeError: repeat count must be less than infinity [Translate]
    9. RangeError: repeat count must be non-negative [Translate]
    10. ReferenceError: "x" is not defined [Translate]
    11. ReferenceError: assignment to undeclared variable "x" [Translate]
    12. ReferenceError: can't access lexical declaration`X' before initialization [Translate]
    13. ReferenceError: deprecated caller or arguments usage [Translate]
    14. ReferenceError: invalid assignment left-hand side
    15. ReferenceError: reference to undefined property "x" [Translate]
    16. SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated [Translate]
    17. SyntaxError: "use strict" not allowed in function with non-simple parameters [Translate]
    18. SyntaxError: "x" is a reserved identifier [Translate]
    19. SyntaxError: JSON.parse: bad parsing [Translate]
    20. SyntaxError: Malformed formal parameter [Translate]
    21. SyntaxError: Unexpected token
    22. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead [Translate]
    23. SyntaxError: a declaration in the head of a for-of loop can't have an initializer [Translate]
    24. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated [Translate]
    25. SyntaxError: for-in loop head declarations may not have initializers [Translate]
    26. SyntaxError: function statement requires a name [Translate]
    27. SyntaxError: identifier starts immediately after numeric literal [Translate]
    28. SyntaxError: illegal character [Translate]
    29. SyntaxError: invalid regular expression flag "x" [Translate]
    30. SyntaxError: missing ) after argument list [Translate]
    31. SyntaxError: missing ) after condition [Translate]
    32. SyntaxError: missing : after property id [Translate]
    33. SyntaxError: missing ; before statement
    34. SyntaxError: missing = in const declaration [Translate]
    35. SyntaxError: missing ] after element list [Translate]
    36. SyntaxError: missing formal parameter [Translate]
    37. SyntaxError: missing name after . operator [Translate]
    38. SyntaxError: missing variable name [Translate]
    39. SyntaxError: missing } after function body [Translate]
    40. SyntaxError: missing } after property list [Translate]
    41. SyntaxError: redeclaration of formal parameter "x" [Translate]
    42. SyntaxError: return not in function [Translate]
    43. SyntaxError: test for equality (==) mistyped as assignment (=)? [Translate]
    44. SyntaxError: unterminated string literal [Translate]
    45. TypeError: "x" has no properties [Translate]
    46. TypeError: "x" is (not) "y"
    47. TypeError: "x" is not a constructor [Translate]
    48. TypeError: "x" is not a function [Translate]
    49. TypeError: "x" is not a non-null object [Translate]
    50. TypeError: "x" is read-only [Translate]
    51. TypeError: 'x' is not iterable [Translate]
    52. TypeError: More arguments needed [Translate]
    53. TypeError: Reduce of empty array with no initial value [Translate]
    54. TypeError: can't access dead object [Translate]
    55. TypeError: can't access property "x" of "y" [Translate]
    56. TypeError: can't define property "x": "obj" is not extensible [Translate]
    57. TypeError: can't delete non-configurable array element [Translate]
    58. TypeError: can't redefine non-configurable property "x" [Translate]
    59. TypeError: cannot use 'in' operator to search for 'x' in 'y' [Translate]
    60. TypeError: cyclic object value [Translate]
    61. TypeError: invalid 'instanceof' operand 'x' [Translate]
    62. TypeError: invalid Array.prototype.sort argument [Translate]
    63. TypeError: invalid arguments [Translate]
    64. TypeError: invalid assignment to const "x" [Translate]
    65. TypeError: property "x" is non-configurable and can't be deleted [Translate]
    66. TypeError: setting getter-only property "x" [Translate]
    67. TypeError: variable "x" redeclares argument [Translate]
    68. URIError: malformed URI sequence [Translate]
    69. Warning: -file- is being assigned a //# sourceMappingURL, but already has one [Translate]
    70. Warning: 08/09 is not a legal ECMA-262 octal constant [Translate]
    71. Warning: Date.prototype.toLocaleFormat is deprecated [Translate]
    72. Warning: JavaScript 1.6's for-each-in loops are deprecated [Translate]
    73. Warning: String.x is deprecated; use String.prototype.x instead [Translate]
    74. Warning: expression closures are deprecated [Translate]
    75. Warning: unreachable code after return statement [Translate]
    76. X.prototype.y called on incompatible type [Translate]
  14. Misc
    1. JavaScript technologies overview
    2. Lexical grammar
    3. JavaScript data structures
    4. Enumerability and ownership of properties
    5. Iteration protocols
    6. Strict mode
    7. Transitioning to strict mode
    8. Template literals
    9. Deprecated features
  15. New in JavaScript
    1. ECMAScript 6 support in Mozilla
    2. ECMAScript 5 support in Mozilla [Translate]
    3. ECMAScript Next support in Mozilla [Translate]
    4. Firefox JavaScript changelog [Translate]
    5. New in JavaScript 1.1 [Translate]
    6. New in JavaScript 1.2 [Translate]
    7. New in JavaScript 1.3 [Translate]
    8. New in JavaScript 1.4 [Translate]
    9. New in JavaScript 1.5 [Translate]
    10. Novità in JavaScript 1.6
    11. Novità in JavaScript 1.7
    12. New in JavaScript 1.8 [Translate]
    13. New in JavaScript 1.8.1 [Translate]
    14. Novità in JavaScript 1.8.5
  16. Documentation:
  17. Useful lists
    1. All pages index
    2. Methods index
    3. Properties index
    4. Pages tagged "JavaScript"
  18. Contribute
    1. JavaScript doc status
    2. The MDN project