<html>
<head>
<title>Test</title>
<style type="text/css">
.divClass{
height:400px;
width:25%;
overflow:auto;
}
.divHeadClass{
overflow:hidden;
}
</style>
</head>
<body>
<div id="htmlDivID" class="divClass">
<table style="word-break: break-all;background-color:#7f9db9;" border="0" cellspacing="1" cellpadding="0" >
<thead>
<tr style="background-color:#dfdfdf;">
<th width="20%" rowspan="1" colspan="1">Head</th>
<th width="5%" rowspan="1" colspan="1">Count</th>
</tr>
</thead>
<tbody>
<tr>
<td width="20%" rowspan="1">head0</td>
<td width="5%" rowspan="1">0</td>
</tr>
<tr>
<td width="20%" rowspan="1">head50</td>
<td width="5%" rowspan="1">50</td>
</tr>
<tr>
<td width="20%" rowspan="1">head05</td>
<td width="5%" rowspan="1">05</td>
</tr>
<tr>
<td width="20%" rowspan="1">head40</td>
<td width="5%" rowspan="1">40</td>
</tr>
<tr>
<td width="20%" rowspan="1">head04</td>
<td width="5%" rowspan="1">04</td>
</tr>
<tr>
<td width="20%" rowspan="1">head70</td>
<td width="5%" rowspan="1">70</td>
</tr>
<tr>
<td width="20%" rowspan="1">head07</td>
<td width="5%" rowspan="1">07</td>
</tr>
<tr>
<td width="20%" rowspan="1">head10</td>
<td width="5%" rowspan="1">01</td>
</tr>
<tr>
<td width="20%" rowspan="1">head110</td>
<td width="5%" rowspan="1">011</td>
</tr>
<tr>
<td width="20%" rowspan="1">head02</td>
<td width="5%" rowspan="1">02</td>
</tr>
<tr>
<td width="20%" rowspan="1">head03</td>
<td width="5%" rowspan="1">03</td>
</tr>
<tr>
<td width="20%" rowspan="1">head066</td>
<td width="5%" rowspan="1">066</td>
</tr>
<tr>
<td width="20%" rowspan="1">head660</td>
<td width="5%" rowspan="1">60</td>
</tr>
<tr>
<td width="20%" rowspan="1">head055</td>
<td width="5%" rowspan="1">055</td>
</tr>
<tr>
<td width="20%" rowspan="1">head0</td>
<td width="5%" rowspan="1">0</td>
</tr>
<tr>
<td width="20%" rowspan="1">head0</td>
<td width="5%" rowspan="1">0</td>
</tr>
<tr>
<td width="20%" rowspan="1">head022</td>
<td width="5%" rowspan="1">022</td>
</tr>
<tr>
<td width="20%" rowspan="1">head220</td>
<td width="5%" rowspan="1">220</td>
</tr>
<tr>
<td width="20%" rowspan="1">head055</td>
<td width="5%" rowspan="1">055</td>
</tr>
<tr>
<td width="20%" rowspan="1">head034</td>
<td width="5%" rowspan="1">034</td>
</tr>
<tr>
<td width="20%" rowspan="1">head023</td>
<td width="5%" rowspan="1">023</td>
</tr>
<tr>
<td width="20%" rowspan="1">head021</td>
<td width="5%" rowspan="1">021</td>
</tr>
<tr>
<td width="20%" rowspan="1">head210</td>
<td width="5%" rowspan="1">210</td>
</tr>
<tr>
<td width="20%" rowspan="1">head012</td>
<td width="5%" rowspan="1">012</td>
</tr>
<tr>
<td width="20%" rowspan="1">head120</td>
<td width="5%" rowspan="1">120</td>
</tr>
<tr>
<td width="20%" rowspan="1">head0111</td>
<td width="5%" rowspan="1">0111</td>
</tr>
<tr>
<td width="20%" rowspan="1">head1110</td>
<td width="5%" rowspan="1">1110</td>
</tr>
</tbody>
</table>
</div>
</body>
<script language="javascript">
window.onload = function(){
//获得存放表格的DIV
var htmlDivDom = document.getElementById("htmlDivID");
//获得表格的头部的偏移高度
var theadHeight = htmlDivDom.children[0].children[0].offsetHeight;
//创建可见的头部DIV
var divHeadDom = document.createElement("<div class=\"divHeadClass\"></div>");
//将创建的头部添加到表格DIV的前面
htmlDivDom.parentNode.insertBefore(divHeadDom,htmlDivDom);
//并设置其高度为表格头部的偏移高度
divHeadDom.style.height = theadHeight;
//克隆表格
var htmlDivCloneDom = htmlDivDom.children[0].cloneNode(true);
//将克隆表格添加到头部DIV中
divHeadDom.appendChild(htmlDivCloneDom);
//设置表格的顶边距
htmlDivDom.children[0].style.marginTop = - theadHeight;
//设置头部DIV的宽度：由表格DIV的偏移宽度-滚动条的宽度
if(htmlDivDom.scrollHeight > htmlDivDom.clientHeight){
var scrollWidth = getScrollWidth();
divHeadDom.style.width = htmlDivDom.offsetWidth - scrollWidth;
}else{
divHeadDom.style.width = htmlDivDom.offsetWidth;
}
var rows = htmlDivDom.children[0].children[1].getElementsByTagName("tr");
for(var i =0,len=rows.length;i < len;i++){
if(i % 2 == 0){
rows[i].style.backgroundColor = "#f9f9f9";
}else{
rows[i].style.backgroundColor = "#e5f1ff";
}
}
}
//创建一个DIV，添加到页面中，先得到没有滚动条的宽度，再得到有滚动条的宽度，两者的差就是滚动条的宽度
function getScrollWidth(){
var divDom = document.createElement("div");
divDom.style.cssText = "position:absolute;top:-1000;height:100px;width:100px;overflow:hidden;";
var noScrollWidth = document.body.appendChild(divDom).clientWidth;
divDom.style.overflow = "scroll";
var scrollWidth = divDom.clientWidth;
return noScrollWidth - scrollWidth;
}
</script>
</html>
