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我目前有问题选择表内表使用jquery我想要的是选择表中的第二个表，如HTML下面的代码给出的。我已经尝试了以下jquery代码，但是当我使用它时，将第一个tr与style="display:none;"相加，因为我在下面写下它以显示它选择的tr，而我想选择第三个table tr。任何人都可以请帮我选择合适的table。无法选择jQuery中的表内表
这里是我的尝试：
<script>
$(document).ready(function() {
$("table td:contains('NIL')").closest("tr").hide();
});
</script>
<table width="79%" border="0" cellpadding="0" cellspacing="0" height="350">
<tr style="display:none;">
<td valign="top" width="1%" bgcolor=#FFFFFF>
</td>
<td valign="top" width="78%" bgcolor=#FFFFFF>
<center>
<br><b><u>COURSE PAGE - Winter Semester 2015~16</u></b><br /><br />
<table cellspacing='0' cellpadding='4' align='center' border='1' width='95%' style='border-collapse: collapse;' bordercolor='black'>
<tr align=center bgcolor=#5A768D>
<td width=80><font color=#FFFFFF>Course Owner</font></td>
<td width=70><font color=#FFFFFF>Course Code</font></td>
<td><font color=#FFFFFF>Course Title</font></td>
<td><font color=#FFFFFF>Course Type</font></td>
<td><font color=#FFFFFF>Faculty</font></td>
<td><font color=#FFFFFF>Class Nbr(s)</font></td>
<td><font color=#FFFFFF>Slot(s)</font></td>
</tr>
<tr bgcolor='#E1ECF2'>
<td width=80 align=center>SITE</td>
<td width=70 align=center>ITE302</td>
<td>Database Systems</td>
<td>Embedded Lab</td>
<td>11543 - SARAVANAKUMAR K - SITE</td>
<td>2039</td>
<td>L29+L30</td>
</tr>
</table><br>
<table cellspacing='0' cellpadding='4' width="95%" align='center' border='1' style='border-collapse: collapse;' bordercolor='black' height="61">
<tr>
<td bgcolor=#5A768D width="22%" height="30"><font color=#FFFFFF>Syllabus</font></td>
<form action='syllabus_file.asp' method='post'><td bgcolor='#EDEADE' width='75%' height='30'><input type='hidden' name='crscd' value='ITE302'><input type='hidden' name='crstp' value='ELA'><input type='hidden' name='version' value='1'><input type='submit' name='sybcmd' class='submit' value='Download'></td></form>
</tr>
<tr>
<td bgcolor=#5A768D width="22%" height="30" rowspan=5 valign=top>
<font color=#FFFFFF>Text/Reference Material</font>
</td>
<td bgcolor='#EDEADE' width="75%" height="30">
<a href='https://academics.vit.ac.in/faculty/Syllabus_Textbook/WINSEM2015-16_CP1673_TB01_DBMS_Lab_Manual.pdf' target='_blank'><font color=blue>DBMS_Lab_Manual.pdf</font></a>
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="75%" height="30">
<a href='https://academics.vit.ac.in/faculty/Syllabus_Textbook/WINSEM2015-16_CP1673_TB02_Structured-Query-Language.pdf' target='_blank'><font color=blue>Structured-Query-Language.pdf</font></a>
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="75%" height="30">
<a href='https://academics.vit.ac.in/faculty/Syllabus_Textbook/WINSEM2015-16_CP1673_TB03_students_manual.pdf' target='_blank'><font color=blue>students_manual.pdf</font></a>
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="75%" height="30">
NIL
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="75%" height="30">
NIL
</td>
</tr>
</table><br>
<table cellspacing='0' cellpadding='4' width="95%" align='center' border='1' style='border-collapse: collapse;' bordercolor='black' height="61">
<tr>
<td bgcolor=#5A768D width="22%" height="30" rowspan=5 valign=top>
<font color=#FFFFFF>Assignments</font>
</td>
<td bgcolor='#EDEADE' width="76%" height="30">
NIL
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="76%" height="30">
NIL
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="76%" height="30">
NIL
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="76%" height="30">
NIL
</td>
</tr>
<tr>
<td bgcolor='#EDEADE' width="76%" height="30">
NIL
</td>
</tr>
</table><br>
哪里是你的''