JavaScript：双击鼠标左键实现滚动屏幕

将下面的代码复制到body间，就可以在网页实现双击鼠标左键滚动屏幕了：

<script language="JavaScript" type="text/JavaScript">
//双击鼠标左键实现滚动屏幕
var currentpos,timer;
function initialize()
...{
timer=setInterval ("scrollwindow ()",30);
}
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>
<script language="JavaScript" type="text/JavaScript">
<!--
function MM_reloadPage(init) ...{  //reloads the window if Nav4 resized
  if (init==true) with (navigator) ...{if ((appName=="Netscape")&&(parseInt(appVersion)==4)) ...{
    document.MM_pgW=innerWidth; document.MM_pgH=innerHeight; onresize=MM_reloadPage; }}
  else if (innerWidth!=document.MM_pgW || innerHeight!=document.MM_pgH) location.reload();
}
MM_reloadPage(true);
//-->
</script>