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.meta
32. import()
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 OR (||)
45. Logical OR assignment (||=)
46. Multiplication (*)
47. Multiplication assignment (*=)
48. new operator
49. new.target
50. null
51. Nullish coalescing assignment (??=)
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
正则表达式
错误
1. 概述
2. Error: Permission denied to access property "x"
3. InternalError: too much recursion
4. RangeError: argument is not a valid code point
5. RangeError: BigInt division by zero
6. RangeError: BigInt negative exponent
7. RangeError: invalid array length
8. RangeError: invalid date
9. RangeError: precision is out of range
10. RangeError: radix must be an integer
11. RangeError: repeat count must be less than infinity
12. RangeError: repeat count must be non-negative
13. RangeError: x can't be converted to BigInt because it isn't an integer
14. ReferenceError: "x" is not defined
15. ReferenceError: assignment to undeclared variable "x"
16. ReferenceError: can't access lexical declaration 'X' before initialization
17. ReferenceError: deprecated caller or arguments usage
18. ReferenceError: reference to undefined property "x"
19. SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated
20. SyntaxError: "use strict" not allowed in function with non-simple parameters
21. SyntaxError: "x" is a reserved identifier
22. SyntaxError: a declaration in the head of a for-of loop can't have an initializer
23. SyntaxError: applying the 'delete' operator to an unqualified name is deprecated
24. SyntaxError: await is only valid in async functions, async generators and modules
25. SyntaxError: cannot use `??` unparenthesized within `||` and `&&` expressions
26. SyntaxError: continue must be inside loop
27. SyntaxError: for-in loop head declarations may not have initializers
28. SyntaxError: function statement requires a name
29. SyntaxError: identifier starts immediately after numeric literal
30. SyntaxError: illegal character
31. SyntaxError: invalid assignment left-hand side
32. SyntaxError: invalid BigInt syntax
33. SyntaxError: invalid regular expression flag "x"
34. SyntaxError: JSON.parse: bad parsing
35. SyntaxError: label not found
36. SyntaxError: missing ; before statement
37. SyntaxError: missing : after property id
38. SyntaxError: missing ) after argument list
39. SyntaxError: missing ) after condition
40. SyntaxError: missing ] after element list
41. SyntaxError: missing } after function body
42. SyntaxError: missing } after property list
43. SyntaxError: missing = in const declaration
44. SyntaxError: missing formal parameter
45. SyntaxError: missing name after . operator
46. SyntaxError: missing variable name
47. SyntaxError: redeclaration of formal parameter "x"
48. SyntaxError: return not in function
49. SyntaxError: test for equality (==) mistyped as assignment (=)?
50. SyntaxError: Unexpected '#' used outside of class body
51. SyntaxError: Unexpected token
52. SyntaxError: unlabeled break must be inside loop or switch
53. SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**'
54. SyntaxError: unterminated string literal
55. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
56. TypeError: 'x' is not iterable
57. TypeError: "x" has no properties
58. TypeError: "x" is (not) "y"
59. TypeError: "x" is not a constructor
60. TypeError: "x" is not a function
61. TypeError: "x" is not a non-null object
62. TypeError: "x" is read-only
63. TypeError: can't assign to property "x" on "y": not an object
64. TypeError: can't convert BigInt to number
65. TypeError: can't convert x to BigInt
66. TypeError: can't define property "x": "obj" is not extensible
67. TypeError: can't delete non-configurable array element
68. TypeError: can't redefine non-configurable property "x"
69. TypeError: cannot use 'in' operator to search for 'x' in 'y'
70. TypeError: cyclic object value
71. TypeError: invalid 'instanceof' operand 'x'
72. TypeError: invalid Array.prototype.sort argument
73. TypeError: invalid assignment to const "x"
74. TypeError: More arguments needed
75. TypeError: property "x" is non-configurable and can't be deleted
76. TypeError: Reduce of empty array with no initial value
77. TypeError: setting getter-only property "x"
78. TypeError: X.prototype.y called on incompatible type
79. URIError: malformed URI sequence
80. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
81. Warning: unreachable code after return statement
更多
1. JavaScript 知识概要
2. 词法文法
3. 迭代协议
4. 严格模式
5. 模板字符串
6. 尾后逗号
7. 已废弃的特性

尝试一下

语法

示例

使用幂赋值

规范

浏览器兼容性

参见