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)、EXERCISE(p.414)を解いてみる。
EXERCISE(p.414)
HTML5 (BBEdit, Emacs)
<!DOCTYPE html>
<head>
<meta charset="utf-8" />
<title>Image Guess</title>
<script src="image_guess.js"></script>
<link type="css/text" href="image_guess.css" rel="stylesheet">
</head>
<body>
<img id="zero" src="zeroblur.jpg">
<img id="one" src="oneblur.jpg">
<img id="two" src="twoblur.jpg">
<img id="three" src="threeblur.jpg">
<img id="four" src="fourblur.jpg">
<img id="five" src="fiveblur.jpg">
</body>
</html>
Cascading Style Sheets(CSS)(BBEdit, Emacs)
image_guess.css
body {
margin: 20px;;
}
img {
margin: 20px;
}
コード (BBEdit, Emacs)
image_guess.js
var init = function () {
var images = document.getElementsByTagName('img'),
i,
max;
for (i = 0, max = images.length; i < max; i += 1) {
images[i].onmouseover = showAnswer;
images[i].onmouseout = reblur;
}
},
showAnswer = function (event_obj) {
var image = event_obj.target,
name = image.id;
name += '.jpg';
image.src = name;
},
reblur = function (event_obj) {
var image = event_obj.target,
name = image.id;
name += 'blur.jpg';
image.src = name;
};
window.onload = init;
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