function level_01(){ // function message value var message = "inside function"; console.log("level_01: " + message); function level_02(){ console.log("level_02: " + message); function level_03(){ var fruit = "orange"; console.log("level_03: " + message); } level_03(); } level_02(); } // output function message value level_01(); // level_01: inside function // level_02: inside function // level_03: inside function