table表头固定，内容可滚动问题

<div class="title_div" id="tdiv">
<table class="title_tb" id="tb1">
<tr>
<td width="80">文件类型</td>
<td width="80">文件名</td>
<td width="80">大小</td>
<td width="80">全景</td>
<td width="80">状态</td>
<td width="150">操作</td>
</tr>
</table>
</div>
<div class="data_div" id="ddiv">
<table class="title_tb" id="tb2">
<tr>
<td width="80">0</td>
<td width="80">gaaaaaaaaadddddsssssssssssssssssssssssssssseeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee</td>
<td width="80">图片亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园</td>
<td width="80">300kb亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园</td>
<td width="80">上传成功亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园亲子乐园</td>
<td class="last_td" width="150">
<div class="delate"><a href="">删 除</a></div>
<div class="upload"><a href="">重新上传</a></div>
</td>

</tr>
<tr>
<td>1</td>
<td>图片</td>
<td>300kb</td>
<td>是</td>
<td>上传成功</td>
<td class="last_td">
<div class="delate"><a href="">删 除</a></div>
<div class="upload"><a href="">重新上传</a></div>
</td>
</tr>
<tr>
<td>亲子乐园</td>
<td>图片</td>
<td>300kb</td>
<td>是</td>
<td>上传成功</td>
<td class="last_td">
<div class="delate"><a href="">删 除</a></div>
<div class="upload"><a href="">重新上传</a></div>
</td>
</tr>
<tr>
<td>亲子乐园</td>
<td>图片</td>
<td>300kb</td>
<td>是</td>
<td>上传成功</td>
<td class="last_td">
<div class="delate"><a href="">删 除</a></div>
<div class="upload"><a href="">重新上传</a></div>
</td>
</tr>
<tr>
<td>亲子乐园</td>
<td>图片</td>
<td>300kb</td>
<td>是</td>
<td>上传成功</td>
<td class="last_td">
<div class="delate"><a href="">删 除</a></div>
<div class="upload"><a href="">重新上传</a></div>
</td>
</tr>
<tr>
<td>亲子乐园</td>
<td>图片</td>
<td>300kb</td>
<td>是</td>
<td>上传成功</td>
<td class="last_td">
<div class="delate"><a href="">删 除</a></div>
<div class="upload"><a href="">重新上传</a></div>
</td>
</tr>
</table>
</div>

html, body {
margin: 0;
padding: 0;
}

.title_tb, .data_div {
overflow: auto;
border-collapse: collapse;
cellspacing: 0;
cellpadding: 0;
text-align: center;
table-layout: fixed;
width: 904px;
}

#tb1 td {
/*width: 80px;*/
border-bottom: 1px solid #c2d4f2;
border-right: 1px solid #c2d4f2;
font-size: 14px;
text-align: center;
height: 38px;
color: #fff;
background: #4166a2;
}

#tb2 td {
text-indent: 8px;
border-bottom: 1px solid #c2d4f2;
border-right: 1px solid #c2d4f2;
font-size: 14px;
text-align: center;
height: 38px;
color: #626262;
white-space: nowrap;
text-overflow: ellipsis;
overflow: hidden;

}

.title_div, .data_div {
overflow-x: hidden;
overflow-y: scroll;
background: white;
}

.data_div {
height: 100px;
}

.last_td {
position: relative;
}

.delate {
position: absolute;
right: 115px;
top: 6.5px;
width: 70px;
line-height: 25px;
background: #ccc;
border-radius: 5px;
}

.delate a {
display: block;
color: #666;
}

.upload {
position: absolute;
right: 15px;
top: 6.5px;
width: 90px;
line-height: 25px;
background: #009688;
border-radius: 5px;
}

.upload a {
display: block;
color: #fff;
}

var jstb1 = document.getElementById("tb1").rows[0];
var jstb2 = document.getElementById("tb2").rows[0];
var divw = 0;
for (var i = 0; i < 6; i++) {
if (jstb1.cells[i].clientWidth > jstb2.cells[i].clientWidth) {
jstb2.cells[i].style.width = parseInt(jstb1.cells[i].clientWidth) - 2 + "px";
divw += parseInt(jstb1.cells[i].clientWidth) - 2;
} else {
jstb1.cells[i].style.width = parseInt(jstb2.cells[i].clientWidth) - 2 + "px";
divw += parseInt(jstb2.cells[i].clientWidth) - 2;
}
}
divw += 27;
divw += "px";
document.getElementById("tdiv").style.width = divw;
document.getElementById("ddiv").style.width = divw;
document.getElementById("tdiv1").style.width = divw;
document.getElementById("ddiv1").style.width = divw;