JavaScript实现RGB颜色值转换为16进制字符串的方法

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>javascript RGB转16进制</title>
</head>
<body>
<script>
function toHexString(r,g,b) {
 return ("00000" + (r << 16 | g << 8 | b).toString(16)).slice(-6);
}
/*
或者：
function RGB2HEX(a,b,c){return"#"+((256+a<<8|b)<<8|c).toString(16).slice(1)}
*/
var hex = toHexString(100, 100, 100);
alert(hex);
</script>
</body>
</html>