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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>val()方法</title>
<style type="text/css">
<!--
select, p, span{
font-size:13px;
font-family:Arial, Helvetica, sans-serif;
}
-->
</style>
<script language="javascript" src="jquery.min.js"></script>
<script language="javascript">
function displayVals(){
//直接获取选中项的value值
var singleValues = $("#constellation1").val();
var multipleValues = $("#constellation2").val() || []; //因为存在不选的情况
$("span").html("<b>Single:</b> " + singleValues + "<br><b>Multiple:</b> " + multipleValues.join(", "));
}
$(function(){
//当修改选中项时调用
$("select").change(displayVals);
displayVals();
});
</script>
</head>
<body>
<span></span><br>
<form method="post" name="myForm1">
<p>
<select id="constellation1">
<option value="Aries">白羊</option>
<option value="Taurus">金牛</option>
<option value="Gemini">双子</option>
<option value="Cancer">巨蟹</option>
<option value="Leo">狮子</option>
<option value="Virgo">处女</option>
<option value="Libra">天秤</option>
<option value="Scorpio">天蝎</option>
<option value="Sagittarius">射手</option>
<option value="Capricorn">摩羯</option>
<option value="Aquarius">水瓶</option>
<option value="Pisces">双鱼</option>
</select>
<select id="constellation2" multiple="multiple" style="height:120px;">
<option value="Aries">白羊</option>
<option value="Taurus">金牛</option>
<option value="Gemini">双子</option>
<option value="Cancer">巨蟹</option>
<option value="Leo">狮子</option>
<option value="Virgo">处女</option>
<option value="Libra">天秤</option>
<option value="Scorpio">天蝎</option>
<option value="Sagittarius">射手</option>
<option value="Capricorn">摩羯</option>
<option value="Aquarius">水瓶</option>
<option value="Pisces">双鱼</option>
</select>
</p>
</form>
</body>
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