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<!DOCTYPE>
<html>
<head>
<script typet="text/javascript" src="http://libs.baidu.com/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
$(function() {
$("#allA").click(function(){
});
$("#allB").click(function(){
});
});
</script>
<meta charset=utf-8>
<title>无标题文档</title>
</head>
<body>
<form id="form1" name="form1" method="post" action="">
<input type="radio" name="sex" value="male" id="allA">全选A<br/>
<input type="radio" name="sex" value="female" id="allB">全选B<br/>
<select name="s1" id>
<option value=""></option>
<option value="aa">A</option>
<option value="bb">B</option>
<option value="cc">C</option>
</select>
<br/>
<select name="s2" id>
<option value=""></option>
<option value="aa">A</option>
<option value="bb">B</option>
<option value="cc">C</option>
</select>
<br/>
<select name="s3" id>
<option value=""></option>
<option value="aa">A</option>
<option value="bb">B</option>
<option value="cc">C</option>
</select>
<br/>
<select name="s4" id>
<option value=""></option>
<option value="aa">A</option>
<option value="bb">B</option>
<option value="cc">C</option>
</select>
<br/>
性别:<select name="s5" id>
<option value="male">男</option>
<option value="female">女</option>
</select>
</form>
</body>
</html>
$(function () {
$("#allA").click(function () { $('select').val('aa') });
$("#allB").click(function () { $('select').val('bb') });
});