JavaScript - Handling events: Asynchronous Coding(add event handlers(load event(onload), click event(onclick)))

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 9(Handling events: Asynchronous Coding)、BE THE BROWSER(p.392)を解いてみる。

BE THE BROWSER(p.392)

• Assign init(event handler) to the window's onload property.
• init is called, grabbing a reference to the image element(id is zero) and assining it to the image variable, assignining showAnswer(event handler ) to the image's onclick property.
• Grabbing a reference to the image element(id is zero) and assining it to the image variable, assining 'zero.jpg' to the image's src property.