JavaScript - Understanding Objects: A trip to Objectville(scope(global, local(function)), this.object)

Head First JavaScript Programming
( O'Reilly Media)
Eric T. Freeman (著), Elisabeth Robson (著)

開発環境

• OS X Mavericks - Apple(OS)
• Safari, Firefox + Firebug, Google Chrome(Webプラウザ、プラグイン)
• BBEdit - Bare Bones Software, Inc. (GUI) , Emacs (CUI) (Text Editor)
• JavaScript (プログラミング言語)

Head First JavaScript Programming (Eric T. Freeman (著)、 Elisabeth Robson (著)、 O'Reilly Media )のChapter 5(Understanding Objects: A trip to Objectville)、BE THE BROWSER(p.203)を解いてみる。

BE THE BROWSER(p.203)

コード(BBEdit, Emacs)

var song = {
        name: 'Walk This Way',
        artist: 'Run-D.M.C',
        minutes: 4,
        seconds: 3,
        genre: '80s',
        playing: false,
        play: function () {
            if (!this.playing) {
                this.playing = true;
                print('Playing ' + this.name + ' by ' + this.artist);
            }
        },
        pause: function () {
            if (this.playing) {
                this.playing = false;
            }
        }
    };

song.play();
song.pause();