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<html>
<head>
<title> New Document </title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
</head>
<body>
<select readonly="readonly">
<option value="13">需求变动</option>
<option value="14">新增需求</option>
<option value="15" selected="selected">设计文档</option>
<option value="16">配置相关</option>
<option value="22">事务跟踪</option>
<option value="23">其他</option>
</select>
<script>
$.fn.selectReadOnly=function(){
var tem=$(this).children('option').index($("option:selected"));
$(this).change(function(){
$(this).children('option').eq(tem).attr("selected",true);
});
}
$("select:[readonly='readonly']").selectReadOnly();
</script>
</body>
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