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
JavaScript
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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 |
Browser compatibility
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) | ? | ? | ? |
See also
License
© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/api/console/warn