jQuery 如何 根据 value 获得 class_html/css_WEB-ITnose

$.each($('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"))    }})

<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>