function invocation

functionInvoked.js

function cook() {
    console.log(this);          // 'this' is 'Window'
                                //  the default global object of Chrome
    function prepare() {
        console.log(this);      // 'this' is also 'Window'
    }
    prepare();
}

var cook101 = function() {
    console.log(this);                  // 'this' is 'Window'
    var prepare101 = function() {
        console.log(this);              // 'this' is 'Window'
    }
    prepare101();
}

cook();                         // direct invocation
prepare101();                   // direct invocation