版权声明：本文为博主原创文章，若转载请加上此页地址。 https://blog.csdn.net/macwhirr123/article/details/80000978
<!DOCTYPE HTML>
<html>
<head>
<meta charset="UTF-8">
<title>test</title>
<script type="text/javascript">
</script>
<script src="jquery-2.1.4.min.js"></script>
<style>
body{font-size:30px;}
</style>
</head>
<body>
<select name="selectp" >
<option value="0" selected>不限</option>
</select>
<hr/>
<a href="javascript:;" class="aaa"> 点击</a>
</body>
</html>
<script type="text/javascript">
$("select").html('<option value="0" selected>不限</option> <option value="1" >111</option> <option value="2" >2222</option> <option value="3" >333</option>');
$("select").find("option[value='2']").attr("selected",true);
$('.aaa').click(function() {
//alert(222);
$("select").find("option").attr("selected",false);//先取消全部选中
$("select").find("option[value='3']").attr("selected",true);//再设置选中某个
});
</script>