Errors

下面列出了 JavaScript 抛出的错误。这些错误是有用的调试帮助，但报告的问题并不总是十分明了。下面的页面提供有关这些错误的详细信息。每个错误都是基于Error 的对象，并且具有名称和消息。

Web 控制台中显示的错误可能包含指向下面相应页面的链接，以帮助您快速理解代码中的问题。

错误列表

在此列表中，每个页面按名称（错误类型）和信息（更详细的容易理解的错误信息）列出。 总之，这两者提供了理解和解决错误的线索。 有关更多信息，请按照以下链接！

• Error: Permission denied to access property "x"

• InternalError: too much recursion

• RangeError: argument is not a valid code point

• RangeError: invalid array length

• RangeError: invalid date

• RangeError: precision is out of range

• RangeError: radix must be an integer

• RangeError: repeat count must be less than infinity

• RangeError: repeat count must be non-negative

• ReferenceError: "x" is not defined

• ReferenceError: assignment to undeclared variable "x"

• ReferenceError: deprecated caller or arguments usage

• ReferenceError: invalid assignment left-hand side

• ReferenceError: reference to undefined property "x"

• SyntaxError: "0"-prefixed octal literals and octal escape seq. are deprecated

• SyntaxError: "use strict" not allowed in function with non-simple parameters

• SyntaxError: "x" is a reserved identifier

• SyntaxError: JSON.parse: bad parsing

• SyntaxError: Malformed formal parameter

• SyntaxError: Unexpected token

• SyntaxError: Using //@ to indicate sourceURL pragmas is deprecated. Use //# instead

• SyntaxError: a declaration in the head of a for-of loop can't have an initializer

• SyntaxError: applying the 'delete' operator to an unqualified name is deprecated

• SyntaxError: for-in loop head declarations may not have initializers

• SyntaxError: function statement requires a name

• SyntaxError: identifier starts immediately after numeric literal

• SyntaxError: illegal character

• SyntaxError: invalid regular expression flag "x"

• SyntaxError: missing ) after argument list

• SyntaxError: missing ) after condition

• SyntaxError: missing : after property id

• SyntaxError: missing ; before statement

• SyntaxError: missing = in const declaration

• SyntaxError: missing after element list](errors/missing_bracket_after_list)

• SyntaxError: missing formal parameter

• SyntaxError: missing name after . operator

• SyntaxError: missing variable name

• SyntaxError: missing } after function body

• SyntaxError: missing } after property list

• SyntaxError: redeclaration of formal parameter "x"

• SyntaxError: return not in function

• SyntaxError: test for equality (==) mistyped as assignment (=)?

• SyntaxError: unterminated string literal

• TypeError: "x" has no properties

• TypeError: "x" is (not) "y"

• TypeError: "x" is not a constructor

• TypeError: "x" is not a function

• TypeError: "x" is not a non-null object

• TypeError: "x" is read-only

• TypeError: More arguments needed

• TypeError: can't access dead object

• TypeError: can't define property "x": "obj" is not extensible

• TypeError: can't delete non-configurable array element

• TypeError: can't redefine non-configurable property "x"

• TypeError: cyclic object value

• TypeError: invalid 'in' operand "x"

• TypeError: invalid Array.prototype.sort argument

• TypeError: invalid arguments

• TypeError: invalid assignment to const "x"

• TypeError: property "x" is non-configurable and can't be deleted

• TypeError: setting getter-only property "x"

• TypeError: variable "x" redeclares argument

• URIError: malformed URI sequence

• Warning: 08/09 is not a legal ECMA-262 octal constant

• Warning: -file- is being assigned a //# sourceMappingURL, but already has one

• Warning: Date.prototype.toLocaleFormat is deprecated

• Warning: JavaScript 1.6's for-each-in loops are deprecated

• Warning: String.x is deprecated; use String.prototype.x instead

• Warning: expression closures are deprecated

• Warning: unreachable code after return statement