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//比如我HTML页面有50个Radio ,想调用一个JS 方法就可以判断选中的是第几个,
// 而不用在每个Radio 的onclick 里写上<input id="Radio" name="R1" type="radio" onclick="js 方法();" />
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript">
var fn = function () {
var radios = document.getElementsByName('ipt');
for (var i = 0; i < radios.length;i++ ) {
var item = radios[i];
if (item.checked) {
alert(item.getAttribute('value'));
}
}
}
</script>
</head>
<body>
<div id="container">
<input type="radio" name="ipt" value="1" />
<input type="radio" name="ipt" value="2" />
<input type="radio" name="ipt" value="3" />
<input type="radio" name="ipt" value="4" />
</div>
<input type="button" value="submit" onclick="fn()" />
</body>
</html>