</head>
<body>
<select name="like"size="3"multiple="multiple" id=like>
<option>列表一</option>
<option select="select">列表二</option>
<option select="select">l列表三</option>
</select>
<script type="text/javascript">
$(document).ready(function(){
$("select").val(['列表1','列表二']);
alert($("select").val());
});
</script>
</body>
