js DIV滚动条自动滚到底部

<script language="javascript">
function sendText()
{
var e=document.getElementById("div1")
var inp=document.getElementById("inp")
e.innerText=e.innerText+"\n"+inp.value;
//e.scrollTop=e.scrollHeight;
}
function sc()
{
var e=document.getElementById("div1")
e.scrollTop=e.scrollHeight;
}
var s=setInterval("sc()",200)
</script>
<div >