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JSLint informa el uso inesperado de ''&'' y ''|''-Me gustaría limpiar esto

Question

Estoy tratando de limpiar mi código Javascript 100% JSLint.

Tengo un código JS que he extraído de otro lugar para crear un UUID. Ese código tiene la siguiente línea:

s[16] = hexDigits.substr((s[16] & 0x3) | 0x8, 1);

Esta línea incita a JSLint a generar dos mensajes de error:

1) Unexpected use of ''&''
2) Unexpected use of ''|''

No entiendo por qué. Apreciaría consejos sobre cómo recodificar para eliminar el mensaje de error.

Answer 1

¿Le bitwise opción bitwise ? Esa opción advierte sobre todos los usos de las operaciones bitwise, ya que tienden a ser ineficientes en Javascript (los flotadores nativos deben convertirse a ints para la operación bitwise, y luego volver a convertirse)

Answer 2

La razón "por qué" es que las operaciones reales a nivel de bits son extremadamente raras en JS, y los operadores que aparecen en el código JS casi siempre son un error tipográfico para las versiones booleanas ( && , || ). Por eso a JSLint le importa. Este es un uso legítimo de operaciones bitwise sin embargo. Creo que puedes silenciar la advertencia con la bandera bitwise :

/*jslint bitwise: true */

Answer 3

Si está utilizando esta herramienta de pelusa javascript , puede especificar un archivo de configuración en la línea de comandos que especifique qué controles habilitar / deshabilitar.

Por ejemplo, normalmente invoco el mío de la siguiente manera:

jsl -conf jsl.conf

con un archivo jsl.conf que se ve así

#----------------------------------------------------------------------------
#
# This is a slightly edited version of the jsl.default.conf file that comes
# with the install package for JavaScript Lint.
#
#----------------------------------------------------------------------------
#
# Configuration File for JavaScript Lint 0.3.0
# Developed by Matthias Miller (http://www.JavaScriptLint.com)
#
# This configuration file can be used to lint a collection of scripts, or to
# enable or disable warnings for scripts that are linted via the command line.
#
### Warnings
# Enable or disable warnings based on requirements.
# Use "+WarningName" to display or "-WarningName" to suppress.
#
-no_return_value # function {0} does not always return a value
+duplicate_formal # duplicate formal argument {0}
-equal_as_assign # test for equality (==) mistyped as assignment (=)?{0}
+var_hides_arg # variable {0} hides argument
-redeclared_var # redeclaration of {0} {1}
-anon_no_return_value # anonymous function does not always return a value
+missing_semicolon # missing semicolon
+meaningless_block # meaningless block; curly braces have no impact
+comma_separated_stmts # multiple statements separated by commas (use semicolons?)
+unreachable_code # unreachable code
-missing_break # missing break statement
-missing_break_for_last_case # missing break statement for last case in switch
-comparison_type_conv # comparisons against null, 0, true, false, or an empty string allowing implicit type conversion (use === or !==)
-inc_dec_within_stmt # increment (++) and decrement (--) operators used as part of greater statement
+useless_void # use of the void type may be unnecessary (void is always undefined)
+multiple_plus_minus # unknown order of operations for successive plus (e.g. x+++y) or minus (e.g. x---y) signs
+use_of_label # use of label
-block_without_braces # block statement without curly braces
-leading_decimal_point # leading decimal point may indicate a number or an object member
+trailing_decimal_point # trailing decimal point may indicate a number or an object member
-octal_number # leading zeros make an octal number
+nested_comment # nested comment
-misplaced_regex # regular expressions should be preceded by a left parenthesis, assignment, colon, or comma
-ambiguous_newline # unexpected end of line; it is ambiguous whether these lines are part of the same statement
-empty_statement # empty statement or extra semicolon
-missing_option_explicit # the "option explicit" control comment is missing
+partial_option_explicit # the "option explicit" control comment, if used, must be in the first script tag
+dup_option_explicit # duplicate "option explicit" control comment
+useless_assign # useless assignment
-ambiguous_nested_stmt # block statements containing block statements should use curly braces to resolve ambiguity
+ambiguous_else_stmt # the else statement could be matched with one of multiple if statements (use curly braces to indicate intent)
-missing_default_case # missing default case in switch statement
+duplicate_case_in_switch # duplicate case in switch statements
+default_not_at_end # the default case is not at the end of the switch statement
+legacy_cc_not_understood # couldn''t understand control comment using /*@keyword@*/ syntax
+jsl_cc_not_understood # couldn''t understand control comment using /*jsl:keyword*/ syntax
+useless_comparison # useless comparison; comparing identical expressions
+with_statement # with statement hides undeclared variables; use temporary variable instead
+trailing_comma_in_array # extra comma is not recommended in array initializers
+assign_to_function_call # assignment to a function call
-parseint_missing_radix # parseInt missing radix parameter
### Output format
# Customize the format of the error message.
# __FILE__ indicates current file path
# __FILENAME__ indicates current file name
# __LINE__ indicates current line
# __ERROR__ indicates error message
#
# Visual Studio syntax (default):
+output-format __FILE__(__LINE__): __ERROR__
# Alternative syntax:
#+output-format __FILE__:__LINE__: __ERROR__
### Context
# Show the in-line position of the error.
# Use "+context" to display or "-context" to suppress.
#
+context
### Semicolons
# By default, assignments of an anonymous function to a variable or
# property (such as a function prototype) must be followed by a semicolon.
#
+lambda_assign_requires_semicolon
### Control Comments
# Both JavaScript Lint and the JScript interpreter confuse each other with the syntax for
# the /*@keyword@*/ control comments and JScript conditional comments. (The latter is
# enabled in JScript with @cc_on@). The /*jsl:keyword*/ syntax is preferred for this reason,
# although legacy control comments are enabled by default for backward compatibility.
#
#+legacy_control_comments
### JScript Function Extensions
# JScript allows member functions to be defined like this:
# function MyObj() { /*constructor*/ }
# function MyObj.prototype.go() { /*member function*/ }
#
# It also allows events to be attached like this:
# function window::onload() { /*init page*/ }
#
# This is a Microsoft-only JavaScript extension. Enable this setting to allow them.
#
-jscript_function_extensions
### Defining identifiers
# By default, "option explicit" is enabled on a per-file basis.
# To enable this for all files, use "+always_use_option_explicit"
-always_use_option_explicit
# Define certain identifiers of which the lint is not aware.
# (Use this in conjunction with the "undeclared identifier" warning.)
#
# Common uses for webpages might be:
#+define window
#+define document
### Interactive
# Prompt for a keystroke before exiting.
#+pauseatend
### Files
# Specify which files to lint
# Use "+recurse" to enable recursion (disabled by default).
# To add a set of files, use "+process FileName", "+process Folder/Path/*.js",
# or "+process Folder/Path/*.htm".
#

PS Mira mi página UUID de javascript que, por cierto, pasa todas las comprobaciones de JSLint anteriores. :-)