Deprecated and obsolete features

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본 페이지는 자바스크립트의 제외 예정인(즉, 아직 사용할 수 있지만 제거 계획이 있는) 기능과 제외된(즉, 더 이상 사용할 수 없는) 기능을 나열합니다.

제외 예정 기능

아래 기능은 아직 사용할 수 있지만, 언젠가 제거될 예정이므로 주의를 기울여야 합니다. 작성한 코드가 항목 중 하나를 포함하고 있다면 제거해야 합니다.

RegExp 속성

아래 속성은 제외 예정입니다. 이는 String.replace 사용에 영향을 주지 않습니다.

Property Description
$1-$9

Parenthesized substring matches, if any.
Warning: Using these properties can result in problems, since browser extensions can modify them. Avoid them!
$_ See input.
$* See multiline.
$& See lastMatch.
$+ See lastParen.
$` See leftContext.
$' See rightContext.
input The string against which a regular expression is matched.
lastMatch The last matched characters.
lastParen The last parenthesized substring match, if any.
leftContext The substring preceding the most recent match.
rightContext The substring following the most recent match.

The following are now properties of RegExp instances, no longer of the RegExp object:

Property Description
global Whether or not to test the regular expression against all possible matches in a string, or only against the first.
ignoreCase Whether or not to ignore case while attempting a match in a string.
lastIndex The index at which to start the next match.
multiline Whether or not to search in strings across multiple lines.
source 패턴의 텍스트.

RegExp 메서드

  • compile() 메서드는 제외될 예정입니다.
  • valueOf 메서드는 더 이상 RegExp 전용이 아닙니다. Object.valueOf()를 사용하세요.

Function 속성

  • The caller and arguments properties are deprecated, because they leak the function caller. Instead of the arguments property, you should use the arguments object inside function closures.

Legacy generator

Iterator

Object methods

Date methods

Functions

Proxy

Escape sequences

String methods

Obsolete features

These obsolete features have been entirely removed from JavaScript and can no longer be used as of the indicated version of JavaScript.

Object

Property Description
__count__ Returns the number of enumerable properties directly on a user-defined object.
__parent__ Points to an object's context.
Object.prototype.eval() Evaluates a string of JavaScript code in the context of the specified object.
Object.observe() Asynchronously observing the changes to an object.
Object.unobserve() Remove observers.
Object.getNotifier() Creates an object that allows to synthetically trigger a change.

Function

Property Description
arity Number of formal arguments.

Array

Property Description
Array.observe() Asynchronously observing changes to Arrays.
Array.unobserve() Remove observers.

Number

ParallelArray

Statements

E4X

See E4X for more information.

Sharp variables

See Sharp variables in JavaScript for more information.

관련 주제
  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
    4. Atomics
    5. BigInt
    6. Boolean
    7. DataView
    8. Date
    9. Error
    10. EvalError
    11. Float32Array [Translate]
    12. Float64Array [Translate]
    13. Function
    14. Generator
    15. GeneratorFunction
    16. Infinity
    17. Int16Array [Translate]
    18. Int32Array [Translate]
    19. Int8Array [Translate]
    20. InternalError
    21. Intl
    22. Intl.Collator [Translate]
    23. Intl.DateTimeFormat
    24. Intl.ListFormat [Translate]
    25. Intl.NumberFormat
    26. Intl.PluralRules [Translate]
    27. Intl.RelativeTimeFormat [Translate]
    28. JSON
    29. Map
    30. Math
    31. NaN
    32. Number
    33. Object
    34. Promise
    35. Proxy
    36. RangeError
    37. ReferenceError
    38. Reflect
    39. RegExp
    40. Set
    41. SharedArrayBuffer
    42. String
    43. Symbol
    44. SyntaxError
    45. TypeError
    46. TypedArray
    47. URIError [Translate]
    48. Uint16Array
    49. Uint32Array [Translate]
    50. Uint8Array [Translate]
    51. Uint8ClampedArray [Translate]
    52. WeakMap
    53. WeakSet
    54. WebAssembly
    55. decodeURI()
    56. decodeURIComponent()
    57. encodeURI()
    58. encodeURIComponent()
    59. escape() [Translate]
    60. eval()
    61. isFinite()
    62. isNaN()
    63. null
    64. parseFloat()
    65. parseInt()
    66. undefined
    67. unescape() [Translate]
    68. uneval()
  9. Expressions & operators
    1. 산술연산자
    2. Array comprehensions
    3. 할당 연산자
    4. 비트 연산자
    5. 콤마 연산자
    6. 비교 연산자
    7. 삼항 조건 연산자
    8. 구조 분해 할당
    9. Expression closures
    10. Generator comprehensions [Translate]
    11. Grouping operator
    12. Legacy generator function expression [Translate]
    13. 논리 연산자
    14. 객체 초기자
    15. 연산자 우선순위
    16. Pipeline operator [Translate]
    17. 속성 접근자
    18. Spread 문법
    19. async function 표현식
    20. await
    21. class 식
    22. delete operator
    23. 함수 표현식
    24. function* expression
    25. in 연산자
    26. instanceof
    27. new operator
    28. new.target
    29. super
    30. this
    31. typeof
    32. void operator
    33. yield
    34. yield*
  10. Statements & declarations
    1. Legacy generator function
    2. async function
    3. block
    4. break
    5. class
    6. const
    7. continue
    8. debugger
    9. default
    10. do...while
    11. empty
    12. export
    13. for
    14. for await...of [Translate]
    15. for each...in [Translate]
    16. for...in
    17. for...of
    18. 함수 선언
    19. function*
    20. if...else
    21. import
    22. import.meta [Translate]
    23. label
    24. let
    25. return
    26. switch
    27. throw
    28. try...catch
    29. var
    30. while
    31. with
  11. Functions
    1. 화살표 함수
    2. 기본 매개변수
    3. 메서드 정의
    4. Rest 파라미터
    5. arguments 객체
    6. getter
    7. setter
  12. Classes
    1. constructor
    2. extends
    3. static
  13. Errors
    1. Error: Permission denied to access property "x"
    2. InternalError: too much recursion
    3. RangeError: argument is not a valid code point
    4. RangeError: invalid array length
    5. RangeError: invalid date
    6. RangeError: precision is out of range
    7. RangeError: radix must be an integer
    8. RangeError: repeat count must be less than infinity
    9. RangeError: repeat count must be non-negative
    10. ReferenceError: "x" is not defined
    11. ReferenceError: assignment to undeclared variable "x"
    12. ReferenceError: can't access lexical declaration`X' before initialization
    13. ReferenceError: deprecated caller or arguments usage
    14. ReferenceError: invalid assignment left-hand side
    15. ReferenceError: reference to undefined property "x"
    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
    18. SyntaxError: "x" is a reserved identifier
    19. SyntaxError: JSON.parse: bad parsing
    20. SyntaxError: Malformed formal parameter
    21. SyntaxError: Unexpected token
    22. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
    23. SyntaxError: a declaration in the head of a for-of loop can't have an initializer
    24. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated
    25. SyntaxError: for-in loop head declarations may not have initializers
    26. SyntaxError: function statement requires a name
    27. SyntaxError: identifier starts immediately after numeric literal
    28. SyntaxError: illegal character
    29. SyntaxError: invalid regular expression flag "x"
    30. SyntaxError: missing ) after argument list
    31. SyntaxError: missing ) after condition
    32. SyntaxError: missing : after property id
    33. SyntaxError: missing ; before statement
    34. SyntaxError: missing = in const declaration
    35. SyntaxError: missing ] after element list
    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
    41. SyntaxError: redeclaration of formal parameter "x" [Translate]
    42. SyntaxError: return not in function
    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
    48. TypeError: "x" is not a function
    49. TypeError: "x" is not a non-null object [Translate]
    50. TypeError: "x" is read-only
    51. TypeError: 'x' is not iterable
    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. SyntaxError: "x" is not a legal ECMA-262 octal constant
    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 2015 support in Mozilla
    2. ECMAScript 5 support in Mozilla
    3. ECMAScript Next support in Mozilla
    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
    10. New in JavaScript 1.6
    11. New in JavaScript 1.7
    12. New in JavaScript 1.8
    13. New in JavaScript 1.8.1
    14. New 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