<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script type="text/javascript" language="javascript">
function aa() {
var r = document.getElementsByName("city");
for (var i = 0; i < r.length; i++) {
alert(r[i].value);
}
}
</script>
</head>
<body>
<form name="form1" method="post" action="" runat="server">
<input type="text" name="city" value="苏州" /><br />
<input type="text" name="city" value="无锡" /><br />
<input type="text" name="city" value="南通" /><br />
<input type="button" onclick="aa()" value="button">
</form>
</body>
</html>
原文：http://www.cnblogs.com/ChineseMoonGod/p/4440733.html