系统中有个功能用户点击一个按钮要调用webservice，可能会等待较长时间，如果用户不耐烦，再点按钮或点击别的功能就乱套了
想到屏蔽页面所有功能，思路是用户点击按钮，调用一个javascript方法，显示预先在页面中定义好的隐藏div，返回结果后再隐藏div，允许用户继续操作。
==========================================================
<html>
<head>
<title>半透明div</title>
<style>
.#mask {
visibility: hidden;
background-color: #cccccc;
left: 0px;
position: absolute;
top: 0px;
background-image: none;
filter: alpha(opacity : 50);
}
.#dialog {
visibility: hidden;
background-color: #f7fcfe;
z-index: 100;
width: 300px;
height: 50px;
position: absolute;
text-align: center;
font-size: 30px;
color: #FF0000;
font-weight: bold;
vertical-align: middle;
}
</style>
<script language="javaScript">
function show()
{
var d_mask=document.getElementById('mask');
var d_dialog = document.getElementById('dialog');
d_mask.style.width = document.body.clientWidth ;
d_mask.style.height=document.body.clientHeight;
//网页正文全文
//d_mask.style.width = document.body.scrollWidth ;
//d_mask.style.height=document.body.scrollHeight;
d_dialog.style.top = document.body.clientHeight / 2 - 60;
d_dialog.style.left =document.body.clientWidth / 2 -100;
d_mask.style.visibility='visible';
d_dialog.style.visibility='visible';
}
function divBlock_event_mousedown()
{
var e, obj, temp;
obj=document.getElementById('dialog');
e=window.event?window.event:e;
obj.startX=e.clientX-obj.offsetLeft;
obj.startY=e.clientY-obj.offsetTop;
document.onmousemove=document_event_mousemove;
temp=document.attachEvent?document.attachEvent('onmouseup',document_event_mouseup):document.addEventListener('mouseup',document_event_mouseup,'');
}
function document_event_mousemove(e)
{
var e, obj;
obj=document.getElementById('dialog');
e=window.event?window.event:e;
with(obj.style){
position='absolute';
left=e.clientX-obj.startX+'px';
top=e.clientY-obj.startY+'px';
}
}
function document_event_mouseup(e)
{
var temp;
document.onmousemove='';
temp=document.detachEvent?document.detachEvent('onmouseup',document_event_mouseup):document.removeEventListener('mouseup',document_event_mouseup,'');
}
window.onresize = function()
{
var d_mask=document.getElementById('mask');
var d_dialog = document.getElementById('dialog');
d_mask.style.width = document.body.clientWidth ;
d_mask.style.height=document.body.clientHeight;
}
</script>
</head>
<div id ="mask"></div>
<div id ="dialog" onmousedown="divBlock_event_mousedown()">处理中，请等待……</div>
<body>
<table border='0' width="100%" height="100%">
<tr>
<td>
测试
</td>
</tr>
<tr>
<td>
<input type="button" value="显示div" onclick="show()" />
</td>
</tr>
</table>
</body>
</html>