js中通过父级进行查找的解决办法

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<li>  <span class="fr w160 tl">2013-06-24</span>    
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<span class="fl"><a href="/go.html?url={href}"  onmouseover="javascript:changeReadIconOver(this);" onmouseout="javascript:changeReadIconOut(this);">身体健康，万事如意</a></span>'
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<li>  <span class="fr w16