JavaScript - A Quick Dip into Javascript: Getting your feet wet(statements, variables, values)

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 1(A Quick Dip into Javascript: Getting your feet wet)、BE THE BROWSER(p.14)を解いてみる。

BE THE BROWSER(p.14)

コード(BBEdit, Emacs)

// a
var joke = 'JavaScript walked into a bar....',
    toldJoke = false,
    $punchline = 'Better watch out for those semi-colons.',
    percenttage = 20,
    result;

if (toldJoke === true) {
    alert($punchline);
} else {
    alert(joke);
}

// b
var zip_code = 98104,
    joesFavoriteMovie = 'Forbidden Planet',
    movieTicket$ = 9;

if (movieTicket$ >= 9) {
    alert('Too much!');
} else {
    alert("We're going to see " + joesFavoriteMovie); 
}