如何与.on同时调用console.log和console.log（）？

Question

I want to be able to format the console.log() of an event returned, but I can't figure out how to invoke it console.log and console.log() together.

.on("transactionHash", console.log)

This works normally, and returns a transaction hash with no formatting.

.on("transactionHash", function(){console.log('*** Tx Hash:', console.log, '***') })

This prints the strings, but doesn't print the hash. If you use console.log() without declaring a function, it is an error. How can I use both of these with .on simultaneously?

Answer 1

Make sure the callback accepts arguments, and apply console.log with the arguments. It also doesn't make sense to log the console.log function itself, you probably want to leave that out:

.on("transactionHash", function(...args){
  console.log('*** Tx Hash:');
  console.log.apply(console, args);
});

If you know that there's only going to be one argument (or a particular number of arguments), then:

.on("transactionHash", function(arg){
  console.log('*** Tx Hash:');
  console.log(arg);
});