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JSLint informa el uso inesperado de ''&'' y ''|''-Me gustarĂ­a limpiar esto (3)

¿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)

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.


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 */


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. :-)