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

Exponentiation assignment (**=)

尝试一下

语法

Examples

Using exponentiation assignment

Specifications

Browser compatibility

See also