<style>
#apDiv3 {
position:absolute;
left:0px;
top:20px;
width:219px;
z-index:7;
background-color:#EFEFEF;
}
#apDiv6 {
position:absolute;
left:219px;
top:20px;
width:785px;
z-index:6;
background-color:#00CC99;
}
</style>
<body>
<div id="apDiv3"></div>
<div id="apDiv6">
  <p>dfdsfdsff</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
  <p>&nbsp;</p>
</div>
<script language="javascript"> 
document.getElementById("apDiv6").style.height=document.getElementById("apDiv3").scrollHeight+"px"; 
</script>
我想让左边的层的高度根据右边的高度而定,后面那句为什么不能实现啊