如何从 td rowspan=4 获取目标
不确定:
$("#fromTd").parent("tr").next().eq($("#fromTd").attr("rowspan")-1)
<table>
<tr>...</tr>
<tr>...</tr>
<tr><td id="fromTd" rowspan="4"></td></tr>
<tr>...</tr>
<tr>...</tr>
<tr>...</tr>
<tr>...</tr> -> target (can be aleatory position..)
</table>