代码示例：（标识：dhtm_filter_mask_text）
<html>
<head>
<style>
div
{
width:160px;
height:120px;
}
img
{
position:relative;
}
span
{
width:100%;
position:absolute;
top:0px;
left:0px;
}
</style>
<script type="text/javascript">
mouseover=true
function coordinates()
{
if (!moveMe)
{
return
}
if (event.srcElement.id=="moveMe")
{
mouseover=true
pleft=document.getElementById('moveMe').style.pixelLeft
ptop=document.getElementById('moveMe').style.pixelTop
xcoor=event.clientX
ycoor=event.clientY
document.onmousemove=moveImage
}
}
function moveImage()
{
if (mouseover&&event.button==1)
{
document.getElementById('moveMe').style.pixelLeft=pleft+event.clientX-xcoor
document.getElementById('moveMe').style.pixelTop=ptop+event.clientY-ycoor
return false
}
}
function mouseup()
{
mouseover=false
}
document.onmousedown=coordinates
document.onmouseup=mouseup
</script>
</head>
<body>
<span>请移动这个图形：</span>
<h1>www.sou-xun.com</h1>
<p>
Can you read this text?<br />
Pretty cool effect!<br />
W3school DHTML Section<br />
Can you read this text?<br />
Pretty cool effect!<br />
W3school DHTML Section
</p>
<div style="position:absolute;left:0;top:20;filter:mask(color=#000000);width:300;height:200">
<img id="moveMe" src="/static/demo/images/eg_smile.gif" />
</div>
</body>
</html>
