You could override standard console.log()
function with your own, adding the behaviour you need:
console.oldLog = console.log;
console.log = function(value)
{
console.oldLog(value);
window.$log = value;
};
// Usage
console.log('hello');
$log // Has 'hello' in it
This way, you don't have to change your existing logging code. You could also extend it adding an array and storing the whole history of printed objects/values.