工具列

準備要寫一個在網頁上的工具列
試寫一下

<div id='my_toolbar' style='position:absolute;width:99%;height:50px;background-color:#666666;border:#cccccc 2px solid;margin:auto;'>ToolBar</div>
<script>
var toolbarobj = document.getElementById('my_toolbar');
window.onload = getScroll();
window.onscroll = getScroll();

function getScroll()
{
 var t, l, w, h ,y,ny;
 t = document.body.scrollTop;
 h = document.body.scrollHeight;
 y = document.body.clientHeight;
 ny = y-55+t;
 toolbarobj.innerHTML  = t+' '+h+' '+y+' '+ny;
 toolbarobj.style.top  = parseInt(ny);
} 
</script>