keyup不能在id上使用，但可以在文档上使用

Question

我在文本框中检测到回车键事件时遇到问题。我似乎无法使用这个

$("#serial").keyup(function(e) {
    if(e.which == 13) {
...
   }
});

但如果我使用此

，则可以检测到keyup事件

$(document).keyup(function(e) {
    if(e.which == 13) {
...
   }
});

这有点尴尬，因为无论光标位置如何，如果输入键被击中它将触发事件。希望有人会有一个指针。 Thanx：D

---编辑---

我认为包括我在网站上有这些插件是公平的：

<script type="text/javascript" src="js/plugins/wysiwyg/jquery.wysiwyg.js"></script>
<script type="text/javascript" src="js/plugins/wysiwyg/wysiwyg.image.js"></script>
<script type="text/javascript" src="js/plugins/wysiwyg/wysiwyg.link.js"></script>
<script type="text/javascript" src="js/plugins/wysiwyg/wysiwyg.table.js"></script>

<script type="text/javascript" src="js/plugins/flot/jquery.flot.js"></script>
<script type="text/javascript" src="js/plugins/flot/jquery.flot.orderBars.js"></script>
<script type="text/javascript" src="js/plugins/flot/jquery.flot.pie.js"></script>
<script type="text/javascript" src="js/plugins/flot/excanvas.min.js"></script>
<script type="text/javascript" src="js/plugins/flot/jquery.flot.resize.js"></script>

<script type="text/javascript" src="js/plugins/tables/jquery.dataTables.js"></script>
<script type="text/javascript" src="js/plugins/tables/colResizable.min.js"></script>

<script type="text/javascript" src="js/plugins/forms/forms.js"></script>
<script type="text/javascript" src="js/plugins/forms/autogrowtextarea.js"></script>
<script type="text/javascript" src="js/plugins/forms/autotab.js"></script>
<script type="text/javascript" src="js/plugins/forms/jquery.validationEngine-en.js"></script>
<script type="text/javascript" src="js/plugins/forms/jquery.validationEngine.js"></script>
<script type="text/javascript" src="js/plugins/forms/jquery.dualListBox.js"></script>
<script type="text/javascript" src="js/plugins/forms/chosen.jquery.min.js"></script>
<script type="text/javascript" src="js/plugins/forms/jquery.maskedinput.min.js"></script>
<script type="text/javascript" src="js/plugins/forms/jquery.inputlimiter.min.js"></script>
<script type="text/javascript" src="js/plugins/forms/jquery.tagsinput.min.js"></script>

<script type="text/javascript" src="js/plugins/other/calendar.min.js"></script>
<script type="text/javascript" src="js/plugins/other/elfinder.min.js"></script>

<script type="text/javascript" src="js/plugins/uploader/plupload.js"></script>
<script type="text/javascript" src="js/plugins/uploader/plupload.html5.js"></script>
<script type="text/javascript" src="js/plugins/uploader/plupload.html4.js"></script>
<script type="text/javascript" src="js/plugins/uploader/jquery.plupload.queue.js"></script>


<script type="text/javascript" src="js/plugins/ui/jquery.progress.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.jgrowl.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.tipsy.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.alerts.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.colorpicker.js"></script>

<script type="text/javascript" src="js/plugins/wizards/jquery.form.wizard.js"></script>
<script type="text/javascript" src="js/plugins/wizards/jquery.validate.js"></script>

<script type="text/javascript" src="js/plugins/ui/jquery.breadcrumbs.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.collapsible.min.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.ToTop.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.listnav.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.sourcerer.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.timeentry.min.js"></script>
<script type="text/javascript" src="js/plugins/ui/jquery.prettyPhoto.js"></script>
<script type="text/javascript" src="js/plugins/spinner/jquery.mousewheel.js"></script>
<script type="text/javascript" src="js/plugins/spinner/ui.spinner.js"></script>

<script type="text/javascript" src="js/custom.js"></script>

<script type="text/javascript" src="js/charts/chart.js"></script>
<script type="text/javascript" src="js/charts/auto.js"></script>
<script type="text/javascript" src="js/charts/bar.js"></script>
<script type="text/javascript" src="js/charts/hBar.js"></script>
<script type="text/javascript" src="js/charts/pie.js"></script>

事情是..我不知道是否有任何这些没有解决关键事件