目前遇到网站 他的按钮是javascript
用chrome检查后
<a href="javascript:go_ap('../va/index_va_left.htm')"
onmouseover="icoTip(this, '差勤管理')" onmouseout="icoTip()" alt="差勤管理"
title="差勤管理"><img src="../images/space.gif" border="0" class="va_tw"
onmouseover="this.className='va_tw2'" onmouseout="this.className='va_tw'"></a>
<img src="../images/space.gif" border="0" class="va_tw"
onmouseover="this.className='va_tw2'" onmouseout="this.className='va_tw'">
像这种该怎么定位呢?