Javascript - Override console.log and keep the old function

Question

I would like to override console.log and call it on my new function.

I try something like this but I get Uncaught TypeError: Illegal invocation:

Answer 1

You are invoking the console.log function on the window object. You should instead invoke it on the console object.

console.log = function() {
  this.apply(console, arguments);
}.bind(console.log);

console.log('as');

Answer 2

try this:

var console={
    log: function(v){
        alert(v);
    }
};
console.log('hello world');

UPD:

check this:

var originalConsole={
    log: (function(c){
        return function(v){
            c.log(v);
        };
    }(window.console))
};
var console={
    log: function(v){
        originalConsole.log('_original_');
        originalConsole.log(v);
    }
};
console.log('hello world');

originalConsole stores required methods of original console object(only log in my example), then console is overrided with new one.

UPD2

var console=(function(c){
    return {
        log: function(v){
            c.log('_original_');
            c.log(v);
        }
    };
}(window.console));
console.log('hello world');

I hope this will help you.