问题
Where console.log('') gets printed, if I don't have a local setup and working on code inside the browser.
回答1:
you can see the output in the Developer console. In Firefox and Chrome browsers for example - hit CTRL-SHIFT-I and it pops up - then go to ...Console..JS and you can see what you console.log() there
Beyond that (eg. client and runtime logs) see How do I see the logs for Fabric Composer
回答2:
Writing console.log in a Transaction can be used to debug and see the incoming and outgoing data. It can be viewed using developer options by pressing Ctrl+Shift+i in Chrome or Firefox.
But if you are using Composer Playground locally, then the log output is written to the Docker Container.
来源：https://stackoverflow.com/questions/47177296/hyperledger-composer-playground-can-you-see-results-of-console-logsomething