颜色渐变：
代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
#block{ width:400px;}
</style>
<script type="text/javascript">
window.onload=function(){
document.getElementById("block").style.backgroundColor="#ffffff";
setTimeout("colorFlash(255)",300);
}
function colorFlash(newColor){
var hexVal=newColor.toString(16);
if(hexVal.length<2){
hexVal="0"+hexVal;
}
var colorString="#ffff"+hexVal;
var blockDiv=document.getElementById("block");
blockDiv.style.backgroundColor=colorString;
if(newColor>0){
newColor-=5;
setTimeout("colorFlash("+newColor+")",50);
}
}
</script>
</head>
<body>
<div id="block">
<p>hello</p>
</div>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
#block{ width:400px;}
</style>
<script type="text/javascript">
window.onload=function(){
document.getElementById("block").style.backgroundColor="#ffffff";
setTimeout("colorFlash(255)",300);
}
function colorFlash(newColor){
var hexVal=newColor.toString(16);
if(hexVal.length<2){
hexVal="0"+hexVal;
}
var colorString="#ffff"+hexVal;
var blockDiv=document.getElementById("block");
blockDiv.style.backgroundColor=colorString;
if(newColor>0){
newColor-=5;
setTimeout("colorFlash("+newColor+")",50);
}
}
</script>
</head>
<body>
<div id="block">
<p>hello</p>
</div>
</body>
</html>