有关RGB色彩在线转换的方法如下：
<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>标题页</title>
<SCRIPT LANGUAGE="JavaScript">
function showRGB(f)
{
//获取用户输入的RGB值
red = f.red.value;
green = f.green.value;
blue = f.blue.value;
//将RGB转换为16进制Hex值
hexcode = "#" +toHex(red) + toHex(green) + toHex(blue);
document.bgColor = f.hexval.value = hexcode;
}
function toHex(d){
if (isNaN(d)){
d=0;
}
//16进制转换方法
var n=new Number(d).toString(16);
return (n.length==1?"0"+n:n);
}
</script>
</head>
<body>
<form name="rgbform">
<b>请输入RGB颜色值(0 to 255)</b><br>
Red: <input type="text" name="red" size="5"><br>
Green: <input type="text" name="green" size="5"><br>
Blue: <input type="text" name="blue" size="5"><br>
<input type="button" value="显示Hex #" onClick="showRGB(this.form)">
Hex值为: <input type="text" name="hexval" size="7">
</form>
</body>
</html>
