書式
this
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>Sample</title>
<script type="text/javascript"><!--
function check(aObj) {
alert(aObj.value);
}
// --></script>
</head>
<body>
<form>
<input type="button" value="Click" onClick="check(this)">
</form>
</body>
</html>