【id】
<html>
<head>
<script type="text/javascript" src='http://code.jquery.com/jquery-1.5.2.js'></script>
<style type="text/css">
.changeP { font-weight: bold; color:red;}
</style>
<script type="text/javascript">
$(document).ready(function(){
$("#myID").css("border","3px solid red");
});
</script>
</head>
<body>
<div id="myID">0</div>
<div id="myID1">1</div>
<div id="myID2">2</div>
</body>
</html>
