Listening console.log

Question

I want to set a listener for console.log() and do something with the message without preventing the default behaviour. So, the console of the dev tools should g

Answer 1

This is a small hack, but I'm not sure there is a better solution:

console._log_old = console.log
console.log = function(msg) {
    alert(msg);
    console._log_old(msg);
}