<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script type="text/javascript">google.load("jquery", "1.3.2");</script>
<script>
$(document).ready(function(){
$("#button").click(function(){
var a = $("#number").val();
var x= parseInt(a); //轉換成數字型態
var result=x-1; //-1動作
$("#number").val(result); //顯示-1完之後的值
});
});
</script>
</head>
<body>
<label>
<input name="number" type="text" id="number" value="3" />
</label>
<label>
<input type="button" name="button" id="button" value="-1" />
</label>
</body>
</html>
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