<!DOCTYPE html>
<html lang="ja-JP">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,user-scalable=yes,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.5">
<title></title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript">
$(function(){
$("#before").click(function(){
$("img").attr({
src:"img/before.png",
title:"変更前"
});
$("h1").text("変更前");
});
$("#after").click(function(){
$("img").attr({
src:"img/after.png",
title:"変更後"
});
$("h1").text("変更後");
});
//要領の良い記述
/*
$("#before").click(function(){
$("img").attr({
src:$(this).attr("title"),
title:$(this).attr("value")
});
$("h1").text($(this).attr("value"));
});
$("#after").click(function(){
$("img").attr({
src:$(this).attr("title"),
title:$(this).attr("value")
});
$("h1").text($(this).attr("value"));
});
*/
//もっと要領の良い記述
/*
$("input").click(function(){
$("img").attr({
src:$(this).attr("title"),
title:$(this).attr("value")
});
$("h1").text($(this).attr("value"));
});
*/
});
</script>
</head>
<body>
<h1>変更前</h1>
<p>
<input id="before" type="button" value="変更前" title="img/before.png">
<input id="after" type="button" value="変更後" title="img/after.png">
</p>
<img src="img/before.png">
</body>
</html>