Console.warn()

Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

Outputs a warning message to the Web Console.

Note: This feature is available in Web Workers.

Note: In Firefox, warnings have a small exclamation point icon next to them in the Web Console log.

Syntax

console.warn(obj1 [, obj2, ..., objN]);
console.warn(msg [, subst1, ..., substN]);

Parameters

obj1 ... objN: A list of JavaScript objects to output. The string representations of each of these objects are appended together in the order listed and output.
msg: A JavaScript string containing zero or more substitution strings.
subst1 ... substN: JavaScript objects with which to replace substitution strings within msg. This gives you additional control over the format of the output.

See Outputting text to the console in the documentation of console for details.

Specifications

Specification	Status	Comment
Console API The definition of 'console.warn()' in that specification.	Editor's Draft	Initial definition

Feature	Chrome	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	(Yes)	4.0 (2.0)	8	(Yes)	(Yes)
Substitution strings	?	9.0 (9.0)	?	?	?
Available in workers	?	38.0 (38.0)	?	?	?

Feature	Android	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	?	4.0 (2.0)	?	?	?
Substitution strings	?	9.0 (9.0)	?	?	?
Available in workers	?	38.0 (38.0)	?	?	?

Console.warn()

Syntax

Parameters

Specifications

Browser compatibility

See also

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