Use window.console object log, debug, info, warn and error methods to output debug information. All methods can format strings if supplied arguments in printf format.

Use window.console object log, debug, info, warn and error methods + to output debug information. All methods can format strings if supplied arguments + in printf format.
Examples:
+
window.console.log('log %d', 123);
+
window.console.debug('debug %s', "string");
+
window.console.info('info %s', "string " + 123);
+
window.console.warn('warn %f', 123.456);
+
window.console.error('error');