JavaScript Logging Library (with log levels) [closed] - mobile

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Can you recommend an easy JavaScript logging (with log levels) library?
It will be good if I can see logs when testing my application with mobile devices.

Answer 1

Try loglevel (full disclosure: I'm the creator of loglevel).
It's an easy minimal logging library including only the bare essentials (i.e. log levels and little else), and underneath it's (very carefully, for compatibility) internally just logging to console.log and friends where available, so output will end up in the system log, as described in tkone's answer.
For developing you should also check out weinre, which lets you get directly at the console of your app running on live devices, for debugging etc (hosted public instance available at debug.phonegap.com, or you can run it locally yourself to make it a little quicker).

Answer 2

Have a look at Log4JS
You can also use console.log on both Android and iOS.
On iOS, turn on developer tools from the Safari options in the Settings app. You'll have to keep your messages short though since it truncates. More details from Apple here
For Android install the Android SDK and install any of the SDK software packages from [sdk base]/tools/android.
Plug your phone into your computer andgo to [sdk base]/platform_tools/ and run adb devices. You'll see which Android devices are connected. If there is only one, you can just run the logcat command adb logcat. I find it helpful to use grep adb logcat | grep -i console and you'll see all the console.log messages in your website. More details from the Android developer site here

Answer 3

Log.js is a JavaScript logging framework with log levels. I have created this one because all other JS logging frameworks I have found did not satisfy me.
Usage:
var myLog = LogJS.get({name: "MyLog", level: "trace", enabled: true});
myLog.info("Hello, Log");
If you pass a message as a function - it will be evaluated only if appropriate logging level is enabled:
myLog.trace(function() {
return "Current log level is: " + myLog.getLevel();
});
If you don't want to bother with creating a new logger and just want to log something quickly, the here is a default logger LogJS.root that can be used the same way:
LogJS.root.error("Something bad...");