JavaScript
教程
快速入门
JavaScript 指南
1. 介绍
2. 语法和数据类型
3. 流程控制与错误处理
4. 循环与迭代
5. 函数
6. 表达式与运算符
7. 数字和日期
8. 文本格式化
9. 正则表达式
10. 索引集合类
11. 带键的集合
12. 使用对象
13. 使用类
14. 使用 Promise
15. 迭代器和生成器
16. 元编程
17. JavaScript 模块
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
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: cannot use `??` unparenthesized within `||` and `&&` expressions
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 assignment left-hand side
30. SyntaxError: invalid BigInt syntax
31. SyntaxError: invalid regular expression flag "x"
32. SyntaxError: JSON.parse: bad parsing
33. SyntaxError: Malformed formal parameter
34. SyntaxError: missing ; before statement
35. SyntaxError: missing : after property id
36. SyntaxError: missing ) after argument list
37. SyntaxError: missing ) after condition
38. SyntaxError: missing ] after element list
39. SyntaxError: missing } after function body
40. SyntaxError: missing } after property list
41. SyntaxError: missing = in const declaration
42. SyntaxError: missing formal parameter
43. SyntaxError: missing name after . operator
44. SyntaxError: missing variable name
45. SyntaxError: redeclaration of formal parameter "x"
46. SyntaxError: return not in function
47. SyntaxError: test for equality (==) mistyped as assignment (=)?
48. SyntaxError: Unexpected '#' used outside of class body
49. SyntaxError: Unexpected token
50. SyntaxError: unparenthesized unary expression can't appear on the left-hand side of '**'
51. SyntaxError: unterminated string literal
52. SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead
53. TypeError: 'x' is not iterable
54. TypeError: "x" has no properties
55. TypeError: "x" is (not) "y"
56. TypeError: "x" is not a constructor
57. TypeError: "x" is not a function
58. TypeError: "x" is not a non-null object
59. TypeError: "x" is read-only
60. TypeError: can't access dead object
61. TypeError: can't assign to property "x" on "y": not an object
62. TypeError: can't convert BigInt to number
63. TypeError: can't convert x to BigInt
64. TypeError: can't define property "x": "obj" is not extensible
65. TypeError: can't delete non-configurable array element
66. TypeError: can't redefine non-configurable property "x"
67. TypeError: cannot use 'in' operator to search for 'x' in 'y'
68. TypeError: cyclic object value
69. TypeError: invalid 'instanceof' operand 'x'
70. TypeError: invalid Array.prototype.sort argument
71. TypeError: invalid assignment to const "x"
72. TypeError: More arguments needed
73. TypeError: property "x" is non-configurable and can't be deleted
74. TypeError: Reduce of empty array with no initial value
75. TypeError: setting getter-only property "x"
76. TypeError: X.prototype.y called on incompatible type
77. URIError: malformed URI sequence
78. Warning: -file- is being assigned a //# sourceMappingURL, but already has one
79. Warning: 08/09 is not a legal ECMA-262 octal constant
80. Warning: Date.prototype.toLocaleFormat is deprecated
81. Warning: expression closures are deprecated
82. Warning: String.x is deprecated; use String.prototype.x instead
83. Warning: unreachable code after return statement
更多

取余赋值（%=）

尝试一下

语法

示例

使用取余赋值

规范

浏览器兼容性

参见