<script>
function window.onload(){
var td=document.getElementById("tab").getElementsByTagName("td")
var num=0
for(var i=0;i<6;i++)
{
num =parseInt(td[i].style.height)+num
}
document.getElementById("all").style.height=num
}
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<div id="all" style=" overflow:auto; width:300px;; border:1px solid #999999" >
<table width="200" border="0" cellspacing="0" cellpadding="0" id="tab">
<tr>
<td style="height:20px;">1</td>
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<td style="height:30px;">2</td>
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<td style="height:40px;">3</td>
</tr>
<tr>
<td style="height:60px;">4</td>
</tr>
<tr>
<td style="height:30px;">5</td>
</tr>
<tr>
<td style="height:30px;">6</td>
</tr>
<tr>
<td>7</td>
</tr>
<tr>
<td>8</td>
</tr>
<tr>
<td>9</td>
</tr>
<tr>
<td>10</td>
</tr>
</table></div>
function window.onload(){
var td=document.getElementById("tab").getElementsByTagName("td")
var num=0
for(var i=0;i<6;i++)
{
num =parseInt(td[i].style.height)+num
}
document.getElementById("all").style.height=num
}
</script>
<div id="all" style=" overflow:auto; width:300px;; border:1px solid #999999" >
<table width="200" border="0" cellspacing="0" cellpadding="0" id="tab">
<tr>
<td style="height:20px;">1</td>
</tr>
<tr>
<td style="height:30px;">2</td>
</tr>
<tr>
<td style="height:40px;">3</td>
</tr>
<tr>
<td style="height:60px;">4</td>
</tr>
<tr>
<td style="height:30px;">5</td>
</tr>
<tr>
<td style="height:30px;">6</td>
</tr>
<tr>
<td>7</td>
</tr>
<tr>
<td>8</td>
</tr>
<tr>
<td>9</td>
</tr>
<tr>
<td>10</td>
</tr>
</table></div>
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var num=0
for(var i=0;i<6;i++)
{
num =parseInt(td[i].offsetHeight)+num
}
document.getElementById("all").style.height=num
}
</script>
<div id="all" style=" overflow:auto; width:300px;; border:1px solid #999999" >
<table width="200" border="0" cellspacing="0" cellpadding="0" id="tab">
<tr>
<td >1<br><br></td>
</tr>
<tr>
<td >2<br></td>
</tr>
<tr>
<td >3<br><br><br><br></td>
</tr>
<tr>
<td >4<br><br><br>e</td>
</tr>
<tr>
<td>5<br><br><br><br></td>
</tr>
<tr>
<td >6</td>
</tr>
<tr>
<td>7</td>
</tr>
<tr>
<td>8<br><br></td>
</tr>
<tr>
<td>9</td>
</tr>
<tr>
<td>10</td>
</tr>
</table></div>
function window.onload(){
var tr=document.getElementById("tab").getElementsByTagName("tr")
var num=0
for(var i=0;i<6;i++)
{num =parseInt(tr[i].offsetHeight)+num}
document.getElementById("all").style.height=numvar td=document.getElementById("tab").getElementsByTagName("tr")[0].getElementsByTagName("td")
var titletd=document.getElementById("tab1").getElementsByTagName("tr")[0].getElementsByTagName("td")
for(var j=0;j<td.length;j++)
{titletd[j].style.width=td[j].offsetWidth}}
</script>
<div style="width:300px;border:1px solid #999999">
<div id="title" style="width:300px;">
<table width="280" border="0" cellspacing="0" cellpadding="0" id="tab1">
<tr><td>
id
</td>
<td>标题</td>
<td>内容</td>
</tr>
</table>
</div>
<div id="all" style=" overflow:auto; width:300px; " >
<table width="280" border="0" cellspacing="0" cellpadding="0" id="tab">
<tr>
<td >1<br><br></td>
<td >鉴定完毕</td>
<td >你很菜</td>
</tr>
<tr>
<td >2<br></td>
<td >似的似</td>
<td >撒旦法按时 </td>
</tr>
<tr>
<td >3<br><br><br><br></td>
<td > </td>
<td > </td>
</tr>
<tr>
<td >4<br><br><br>e</td>
<td > </td>
<td > </td>
</tr>
<tr>
<td>5<br><br><br><br></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td >6</td>
<td > </td>
<td > </td>
</tr>
<tr>
<td>7</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>8<br><br></td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>9</td>
<td> </td>
<td> </td>
</tr>
<tr>
<td>10</td>
<td> </td>
<td> </td>
</tr>
</table>
</div>
</div>