html

<div id="selector" class="btn-group">
    <button type="button" class="btn active" id="Day">Day</button>
    <button type="button" class="btn" id="Week">Week</button>
    <button type="button" class="btn" id="Month">Month</button>
    <button type="button" class="btn" id="Year">Year</button>
</div>

jquery

$(document).ready(function() {
    alert("abcde");
    $('div.btn').click(function() {
        $(this).addClass('active').siblings().removeClass('active');
        alert($(this).attr('id'));
        alert("abcdef");
        
    });
});
为啥我的代码点击按钮不能生效呢？而且不能弹出"abcdef"，
只能弹出"abcde"，谢谢
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