grayscale.js使网页变黑白实例

<SCRIPT type=text/javascript src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></SCRIPT>
<SCRIPT type=text/javascript src="http://james.padolsey.com/demos/grayscale/grayscale.js"></SCRIPT>
<script type="text/javascript">
  window.onload=function(){
    grayscale(document.body); 
}
</script>