HTML5
<!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>
window.addEventListener("load",function(){
document.querySelector("input[type='button']").addEventListener("click",function(){
document.querySelector("p").innerText = document.querySelector("input[type='text']").value + "にメールを送信します。";
document.querySelector("input[type='text']").value = "確認";
});
});
</script>
<body>
<p>メールアドレス：<input type="text" name="name"></p>
<input type="button" value="確認">
</body>
</html>a
jQuery
<!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>
$(function(){
$("input[type='button']").click(function(){
$("p").text($("input[type='text']").val() + "にメールを送信します。");
$("input[type='button']").text("送信");
});
});
</script>
<body>
<p>メールアドレス：<input type="text" name="name"></p>
<input type="button" value="確認">
</body>
</html>