How does jQuery get class_html/css_WEB-ITnose based on value

See clearly, the class selector is not required to obtain the value!

Study hard
Tiantianshangshang
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is a loop display, and the class of is a loop Numbered, now I know that the value of a certain is 'study hard', how can I get class ='1'


JS, Jquery will do

Reply to discussion (solution)

$.each($('tr td'),function(){     if($(this).text()=="天天向上")    {          alert($(this).attr("class"))    }})

$.each($('tr td'),function(){     if($(this).text()=="天天向上")    {          alert($(this).attr("class"))    }})

Thank you, Daniel, I just went to the meeting.

<table>	<tr>		<td class="2">天天向上</td>		<td class="1">好好学习</td>	</tr></table><script type="text/javascript" src="http://code.jquery.com/jquery-1.11.2.min.js"></script> <script type="text/javascript">alert($("td:contains('好好学习')").attr("class"));</script>

<table>	<tr>		<td class="2">天天向上</td>		<td class="1">好好学习</td>	</tr></table><script type="text/javascript" src="http://code.jquery.com/jquery-1.11.2.min.js"></script> <script type="text/javascript">alert($("td:contains('好好学习')").attr("class"));</script>

No points...