怎样使用jQuery触发Select，Radio的change/onchange事件

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<!DOCTYPE html>
<html>
    <head runat="server">
        <title>test</title>
        <script src="jquery.js" type="text/javascript"></script>
        <script type="text/javascript">
            $(document).ready(function() {
                $(".radioItem").change(function() {
                    var $selectedvalue = $("input[name='rl$tt']:checked").val();
                    // alert($selectedvalue);
                    if ($selectedvalue == 1) {
                        alert('1');
                    } else {
                        alert('2');
                    }
                });
            });
        </script>
    </head>
    <body>
        <input id="rl_1" class="radioItem" checked="checked" name="rl$tt" type="radio" value="1" />
        <label>1</label>
        <input id="rl_2" class="radioItem" name="rl$tt" type="radio" value="2" />
        <label>2</label>
    </body>
</html>

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