debugger

debugger 语句调用任何可用的调试功能，例如设置断点。 如果没有调试功能可用，则此语句不起作用。

语法

debugger;

示例

下面的例子演示了一个包含 debugger 语句的函数，当函数被调用时，会尝试调用一个可用的调试器进行调试。

function potentiallyBuggyCode() {
    debugger;
    // do potentially buggy stuff to examine, step through, etc.
}

当 debugger 被调用时, 执行暂停在 debugger 语句的位置。就像在脚本源代码中的断点一样。

Paused at a debugger statement.

规范

Specification Status Comment
ECMAScript Latest Draft (ECMA-262)
Debugger statement		 Draft  
ECMAScript 2015 (6th Edition, ECMA-262)
Debugger statement		 Standard  
ECMAScript 5.1 (ECMA-262)
Debugger statement		 Standard Initial definition
ECMAScript 3rd Edition (ECMA-262)
Debugger statement		 Standard  
ECMAScript 1st Edition (ECMA-262)
Debugger statement		 Standard Only mentioned as reserved word.

浏览器兼容

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
debuggerChrome Full support 5Edge Full support 12Firefox Full support 1IE Full support 4Opera Full support 10Safari Full support 5WebView Android Full support 1Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 4.2Samsung Internet Android Full support 1.0nodejs Full support Yes

Legend

Full support  
Full support

相关链接

相关主题
  1. JavaScript
  2. 教程:
  3. 快速入门
    1. JavaScript 基础知识
    2. JavaScript first steps
    3. JavaScript building blocks
    4. Introducing JavaScript objects
  4. JavaScript 指南
    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
    17. JavaScript modules
  5. 中级教程
    1. Introducing JavaScript objects
    2. Client-side web APIs
    3. 深入 JavaScript
    4. JavaScript 数据结构
    5. 如何正确判断相等性
    6. Closures
  6. 高级
    1. 继承和原型链
    2. 严格模式
    3. JavaScript 类型化数组
    4. 内存管理
    5. Concurrency model and Event Loop
  7. 引用:
  8. 内置对象
    1. AggregateError
    2. Array
    3. ArrayBuffer
    4. AsyncFunction
    5. AsyncIterator
    6. Atomics
    7. BigInt
    8. BigInt64Array
    9. BigUint64Array
    10. Boolean
    11. DataView
    12. Date
    13. Error
    14. EvalError
    15. Float32Array
    16. Float64Array
    17. Function
    18. Generator
    19. GeneratorFunction
    20. Infinity
    21. Int16Array
    22. Int32Array
    23. Int8Array
    24. InternalError
    25. Intl
    26. Intl.Collator
    27. Intl.DateTimeFormat
    28. Intl.DisplayNames
    29. Intl.ListFormat
    30. Intl.Locale
    31. Intl.NumberFormat
    32. Intl.PluralRules
    33. Intl.RelativeTimeFormat
    34. Iterator [我来译!]
    35. JSON
    36. Map
    37. Math
    38. NaN
    39. Number
    40. Object
    41. Promise
    42. Proxy
    43. RangeError
    44. ReferenceError
    45. Reflect
    46. RegExp
    47. Set
    48. SharedArrayBuffer
    49. String
    50. Symbol
    51. SyntaxError
    52. TypeError
    53. TypedArray
    54. URIError
    55. Uint16Array
    56. Uint32Array
    57. Uint8Array
    58. Uint8ClampedArray
    59. WeakMap
    60. WeakSet
    61. WebAssembly
    62. decodeURI()
    63. decodeURIComponent()
    64. encodeURI()
    65. encodeURIComponent()
    66. escape()
    67. eval()
    68. globalThis
    69. isFinite()
    70. isNaN()
    71. null
    72. parseFloat
    73. parseInt
    74. undefined
    75. unescape()
    76. uneval()
  9. 表达式和运算符
    1. 算术运算符
    2. 数组推导式
    3. 赋值运算符
    4. 按位操作符
    5. 逗号操作符
    6. 比较操作符
    7. 条件运算符
    8. 解构赋值
    9. Expression closures
    10. 函数表达式
    11. Generator推导式
    12. 圆括号运算符
    13. 旧式生成器函数
    14. 逻辑运算符
    15. Nullish coalescing operator
    16. 对象初始化
    17. 运算符优先级
    18. 可选链
    19. 管道操作符
    20. 属性访问器
    21. 展开语法
    22. async function expression
    23. await
    24. 类表达式
    25. delete 操作符
    26. function* 表达式
    27. in
    28. instanceof
    29. new 运算符
    30. new.target
    31. super
    32. this
    33. typeof
    34. void 运算符
    35. yield
    36. yield*
  10. 语句和声明
    1. 遗留的生成器函数
    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
    15. for each...in
    16. for...in
    17. for...of
    18. function
    19. function*
    20. if...else
    21. import
    22. import.meta
    23. label
    24. let
    25. return
    26. switch
    27. throw
    28. try...catch
    29. var
    30. while
    31. with
  11. 函数
    1. 箭头函数
    2. 默认参数值
    3. 方法的定义
    4. 剩余参数
    5. Arguments 对象
    6. getter
    7. setter
  12. Classes
    1. 类元素
    2. 构造方法
    3. extends
    4. 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
    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
    37. SyntaxError: missing name after . operator
    38. SyntaxError: missing variable name
    39. SyntaxError: missing } after function body
    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 (=)?
    44. SyntaxError: unterminated string literal
    45. TypeError: "x" has no properties
    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
    50. TypeError: "x" is read-only
    51. TypeError: 'x' is not iterable
    52. TypeError: More arguments needed
    53. TypeError: Reduce of empty array with no initial value
    54. X.prototype.y called on incompatible type
    55. TypeError: can't access dead object
    56. TypeError: can't access property "x" of "y"
    57. TypeError: can't assign to property "x" on "y": not an object
    58. TypeError: can't define property "x": "obj" is not extensible
    59. TypeError: can't delete non-configurable array element
    60. TypeError: can't redefine non-configurable property "x"
    61. TypeError: invalid 'in' operand "x"
    62. TypeError: cyclic object value
    63. TypeError: invalid 'instanceof' operand 'x'
    64. TypeError: invalid Array.prototype.sort argument
    65. TypeError: invalid arguments
    66. TypeError: invalid assignment to const "x"
    67. TypeError: property "x" is non-configurable and can't be deleted
    68. TypeError: setting getter-only property "x"
    69. TypeError: variable "x" redeclares argument
    70. URIError: malformed URI sequence
    71. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
    72. SyntaxError: "x" is not a legal ECMA-262 octal constant
    73. Warning: Date.prototype.toLocaleFormat is deprecated
    74. Warning: JavaScript 1.6's for-each-in loops are deprecated
    75. Warning: String.x is deprecated; use String.prototype.x instead
    76. Warning: expression closures are deprecated
    77. Warning: unreachable code after return statement
  14. 更多
    1. JavaScript 知识概要
    2. 词法文法
    3. JavaScript 数据结构
    4. 属性的可枚举性和所有权
    5. Iteration protocols
    6. 严格模式
    7. 切换到严格模式
    8. 模板字符串
    9. 已废弃的特性