// Declare a global variable var myOuterNumber = 1; // Function scope function myFunc() { myOuterNumber = 1; // Alter the global variable var myInnerNumber = 10; // Declare a new variable (scoped to this function) console.log(myOuterNumber); // 1 console.log(myInnerNumber); // 10 } // Invoke the function myFunc(); // Adjust the global variable myOuterNumber = 2; // View the results console.log(myOuterNumber); // 2 console.log(myInnerNumber); // ReferenceError: myInnerNumber is not defined