var console=(function(oldCons){ return { log: function(text){ jConsoleLog(text); // Your code }, info: function (text) { jConsoleLog(text); // Your code }, warn: function (text) { jConsoleLog(text); // Your code }, error: function (text) { jConsoleLog(text); // Your code } }; }(window.console)); //Then redefine the old console window.console = console; console.log("Calm down"); function a(){ console.log("Wenas java 1"); console.log("Calm down a 1"); var p = prueba(1); console.log(p); console.log("Wenas java 2"); console.log("Calm down a 2"); }