代码编辑器：
x
1
2
<meta charset="utf-8">3
<script>4
function setColSpan(){5
var x=document.getElementById('myTable').rows[0].cells;6
x[0].colSpan="2";7
x[1].colSpan="6";8
}9
</script>10
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/> 11
<table id="myTable" border="1">12
<tr>13
<td colspan="4">单元格 1</td>14
<td colspan="4">单元格 2</td>15
</tr>16
<tr>17
<td>单元格 3</td>18
<td>单元格 4</td>