JavaScript
教程:
快速入门
JavaScript 指南
中级教程
高级
参考:
内置对象
表达式和运算符
1. 概述
2. Addition (+)
3. Addition assignment (+=)
4. Assignment (=)
5. async function expression
6. async function* expression
7. await
8. Bitwise AND (&)
9. Bitwise AND assignment (&=)
10. Bitwise NOT (~)
11. Bitwise OR (|)
12. Bitwise OR assignment (|=)
13. Bitwise XOR (^)
14. Bitwise XOR assignment (^=)
15. class expression
16. Comma operator (,)
17. Conditional (ternary) operator
18. Decrement (--)
19. delete operator
20. Destructuring assignment
21. Division (/)
22. Division assignment (/=)
23. Equality (==)
24. Exponentiation (**)
25. Exponentiation assignment (**=)
26. Function expression
27. function* expression
28. Greater than (>)
29. Greater than or equal (>=)
30. Grouping operator ( )
31. import
32. import.meta
33. in operator
34. Increment (++)
35. Inequality (!=)
36. instanceof
37. Left shift (<<)
38. Left shift assignment (<<=)
39. Less than (<)
40. Less than or equal (<=)
41. Logical AND (&&)
42. Logical AND assignment (&&=)
43. Logical NOT (!)
44. Logical nullish assignment (??=)
45. Logical OR (||)
46. Logical OR assignment (||=)
47. Multiplication (*)
48. Multiplication assignment (*=)
49. new operator
50. new.target
51. null
52. Nullish coalescing operator (??)
53. Object initializer
54. Operator precedence
55. Optional chaining (?.)
56. Property accessors
57. Remainder (%)
58. Remainder assignment (%=)
59. Right shift (>>)
60. Right shift assignment (>>=)
61. Spread syntax (...)
62. Strict equality (===)
63. Strict inequality (!==)
64. Subtraction (-)
65. Subtraction assignment (-=)
66. super
67. this
68. typeof
69. Unary negation (-)
70. Unary plus (+)
71. Unsigned right shift (>>>)
72. Unsigned right shift assignment (>>>=)
73. void operator
74. yield
75. yield*
语句和声明
函数
类
错误
1. 概述
2. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
3. TypeError: invalid Array.prototype.sort argument
4. Warning: 08/09 is not a legal ECMA-262 octal constant
5. RangeError: radix must be an integer
6. SyntaxError: invalid regular expression flag "x"
7. SyntaxError: return not in function
8. RangeError: BigInt division by zero
9. RangeError: BigInt negative exponent
10. TypeError: X.prototype.y called on incompatible type
11. ReferenceError: can't access lexical declaration 'X' before initialization
12. TypeError: can't assign to property "x" on "y": not an object
13. RangeError: x can't be converted to BigInt because it isn't an integer
14. TypeError: can't convert BigInt to number
15. TypeError: can't convert x to BigInt
16. TypeError: can't define property "x": "obj" is not extensible
17. TypeError: property "x" is non-configurable and can't be deleted
18. TypeError: can't redefine non-configurable property "x"
19. SyntaxError: cannot use `??` unparenthesized within `||` and `&&` expressions
20. TypeError: cyclic object value
21. TypeError: can't access dead object
22. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated
23. ReferenceError: deprecated caller or arguments usage
24. Warning: expression closures are deprecated
25. SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated
26. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
27. Warning: String.x is deprecated; use String.prototype.x instead
28. Warning: Date.prototype.toLocaleFormat is deprecated
29. SyntaxError: test for equality (==) mistyped as assignment (=)?
30. TypeError: setting getter-only property "x"
31. SyntaxError: Unexpected '#' used outside of class body
32. SyntaxError: identifier starts immediately after numeric literal
33. SyntaxError: illegal character
34. TypeError: cannot use 'in' operator to search for 'x' in 'y'
35. RangeError: invalid array length
36. SyntaxError: invalid assignment left-hand side
37. SyntaxError: invalid BigInt syntax
38. TypeError: invalid assignment to const "x"
39. RangeError: invalid date
40. SyntaxError: for-in loop head declarations may not have initializers
41. SyntaxError: a declaration in the head of a for-of loop can't have an initializer
42. TypeError: invalid 'instanceof' operand 'x'
43. TypeError: 'x' is not iterable
44. SyntaxError: JSON.parse: bad parsing
45. SyntaxError: Malformed formal parameter
46. URIError: malformed URI sequence
47. SyntaxError: missing ] after element list
48. SyntaxError: missing : after property id
49. SyntaxError: missing } after function body
50. SyntaxError: missing } after property list
51. SyntaxError: missing formal parameter
52. SyntaxError: missing = in const declaration
53. SyntaxError: missing name after . operator
54. SyntaxError: missing ) after argument list
55. SyntaxError: missing ) after condition
56. SyntaxError: missing ; before statement
57. TypeError: More arguments needed
58. RangeError: repeat count must be non-negative
59. TypeError: "x" is not a non-null object
60. TypeError: "x" has no properties
61. SyntaxError: missing variable name
62. TypeError: can't delete non-configurable array element
63. RangeError: argument is not a valid code point
64. TypeError: "x" is not a constructor
65. TypeError: "x" is not a function
66. ReferenceError: "x" is not defined
67. RangeError: precision is out of range
68. Error: Permission denied to access property "x"
69. TypeError: "x" is read-only
70. SyntaxError: redeclaration of formal parameter "x"
71. TypeError: Reduce of empty array with no initial value
72. SyntaxError: "x" is a reserved identifier
73. RangeError: repeat count must be less than infinity
74. Warning: unreachable code after return statement
75. SyntaxError: "use strict" not allowed in function with non-simple parameters
76. InternalError: too much recursion
77. ReferenceError: assignment to undeclared variable "x"
78. ReferenceError: reference to undefined property "x"
79. SyntaxError: Unexpected token
80. TypeError: "x" is (not) "y"
81. SyntaxError: function statement requires a name
82. SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**'
83. SyntaxError: unterminated string literal
更多

Subtraction assignment (-=)

尝试一下

语法

Examples

Using subtraction assignment

Specifications

Browser compatibility

See also