怎么为td的内容加上删除线

<table>

<tr>

<td id="tab">没变化</td>

</tr>

</table>

<script>

var tab = document.getElementById('tab')

tab.innerHTML = "<s>加上删除线</s>"

</script>这样行吗

<table border="1" cellspacing="0" >

<!--border=1设置包括标签table，tr，td的边框粗细，cellspacing合并标签tr，个td的空隙-->

<tr>

<td>1-1</td>

<td>1-2</td>

</tr>

<tr>

<td>2-1</td>

<td>2-2</td>

</tr>

</table>

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