JavaScript 指南

JavaScript 指南會讓您了解如何使用 JavaScript 並給您這個語言的概觀。若您需要語言功能詳細資訊請參考 JavaScript 參考文件。

章節

本指南區分成以下數個章節：

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相關主題
  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 [Translate]
    5. BigInt [Translate]
    6. Boolean
    7. DataView
    8. Date
    9. Error
    10. EvalError [Translate]
    11. Float32Array [Translate]
    12. Float64Array [Translate]
    13. Function
    14. Generator [Translate]
    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
    33. Object
    34. Promise
    35. Proxy
    36. RangeError [Translate]
    37. ReferenceError [Translate]
    38. Reflect
    39. RegExp [Translate]
    40. Set
    41. SharedArrayBuffer [Translate]
    42. 字串
    43. Symbol [Translate]
    44. SyntaxError [Translate]
    45. TypeError [Translate]
    46. TypedArray
    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() [Translate]
    56. decodeURIComponent() [Translate]
    57. encodeURI() [Translate]
    58. encodeURIComponent() [Translate]
    59. escape() [Translate]
    60. eval() [Translate]
    61. isFinite() [Translate]
    62. isNaN()
    63. null
    64. parseFloat() [Translate]
    65. parseInt()
    66. undefined
    67. unescape() [Translate]
    68. uneval() [Translate]
  9. Expressions & operators
    1. Arithmetic operators [Translate]
    2. Array comprehensions [Translate]
    3. Assignment operators [Translate]
    4. Bitwise operators [Translate]
    5. 逗號運算子
    6. 比較運算子
    7. Conditional (ternary) operator [Translate]
    8. 解構賦值
    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
    15. 運算子優先序
    16. Pipeline operator [Translate]
    17. Property accessors [Translate]
    18. Spread syntax [Translate]
    19. async function expression
    20. await
    21. class expression [Translate]
    22. delete operator [Translate]
    23. function expression [Translate]
    24. function* expression [Translate]
    25. in operator [Translate]
    26. instanceof [Translate]
    27. new operator [Translate]
    28. new.target [Translate]
    29. super [Translate]
    30. this
    31. typeof
    32. void operator [Translate]
    33. yield [Translate]
    34. yield* [Translate]
  10. Statements & declarations
    1. Legacy generator function [Translate]
    2. async function
    3. 區塊
    4. break
    5. class [Translate]
    6. const
    7. continue [Translate]
    8. debugger
    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
    17. for...of [Translate]
    18. function declaration [Translate]
    19. function*
    20. if...else
    21. import
    22. import.meta [Translate]
    23. label [Translate]
    24. let
    25. return
    26. switch [Translate]
    27. throw
    28. try...catch [Translate]
    29. var
    30. while [Translate]
    31. with [Translate]
  11. Functions
    1. 箭頭函式
    2. 預設參數( Default parameters )
    3. 方法定義
    4. 其餘參數
    5. Arguments 物件
    6. getter [Translate]
    7. setter [Translate]
  12. Classes
    1. 建構子
    2. extends
    3. static
  13. Errors
    1. Error: Permission denied to access property "x" [Translate]
    2. InternalError: too much recursion
    3. RangeError: argument is not a valid code point [Translate]
    4. RangeError: invalid array length [Translate]
    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
    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 [Translate]
    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 [Translate]
    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 [Translate]
    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
    41. SyntaxError: redeclaration of formal parameter "x"
    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
    46. TypeError: "x" is (not) "y"
    47. TypeError: "x" is not a constructor [Translate]
    48. TypeError: "x" is not a function
    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 2015 support in Mozilla [Translate]
    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
    6. New in JavaScript 1.2
    7. New in JavaScript 1.3
    8. New in JavaScript 1.4
    9. New in JavaScript 1.5
    10. JavaScript 1.6 新鮮事
    11. JavaScript 1.7 新鮮事
    12. JavaScript 1.8 新鮮事
    13. JavaScript 1.8.1 新鮮事
    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