W3School TIY Editor
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<html> <head> <style> div { position:absolute; left:10px; top:100px; width:160px; height:120px; } </style> <script type="text/javascript"> function getFilter() { document.getElementById('myDiv').style.filter="mask(color=#ffffff)" } function noFilter() { document.getElementById('myDiv').style.filter=false } </script> </head> <body> <p>本例演示如何动态地插入遮罩滤镜。</p> <p>请把鼠标移动到图像上：</p> <div><img src="/i/eg_landscape.jpg" /></div> <div onmouseover="getFilter()" onmouseout="noFilter()" id="myDiv"> <h1>Mouse over this image landscape</h1></div> </body> </html>