js双击滚屏的实现代码

js 双击滚屏的代码。

<script language="javascript">
/**
 * 双击滚屏
 * gy www.jb200.com
*/
var currentpos,timer;
function initialize()
{
timer=setInterval("scrollwindow()",10);
}
function sc(){
clearInterval(timer);
}
function scrollwindow()
{
currentpos=document.body.scrollTop;
window.scroll(0,++currentpos);
if (currentpos != document.body.scrollTop)
sc();
}
document.onmousedown=sc
document.ondblclick=initialize
</script>