源码：判断两种颜色值是否为相似颜色

以下是引用片段：
<!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" lang="gb2312">
<head>
<head>
<title> 判断两种颜色值是否为相似颜色 </title>
<meta http-equiv="content-type" content="text/html; charset=gb2312" />
<meta name="author" content="枫岩,CnLei.y.l@gmail.com">
<meta name="copyright" content="http://www.cnlei.com" />
<link type="text/css" rel="stylesheet" href="" />
</head>
<body>
<script type="text/javascript">
//Title    :  判断两种颜色值是否为相似颜色
//Author  :  CnLei
//WebSite  :  http://www.cnlei.com
//真正应用时，请将alert()提示信息注释掉或删除掉
function isSimilarColor(sHexColorA,sHexColorB,nOffset){
  this.offsetNum=Math.abs(nOffset);
  this.offsetNum>255?this.offsetNum=this.offsetNum-256:"";
  var arrNumA=[parseInt(sHexColorA.substring(0,2),16),
  parseInt(sHexColorA.substring(2,4),16),
  parseInt(sHexColorA.substring(4,6),16)];
  var arrNumB=[parseInt(sHexColorB.substring(0,2),16),
  parseInt(sHexColorB.substring(2,4),16),
  parseInt(sHexColorB.substring(4,6),16)];
  for (var i=0;i<arrNumA.length;i++){
    if(Math.abs(arrNumA[i]-arrNumB[i])>this.offsetNum){
     alert("不相似\n第"+i+"组的差值为:"+(arrNumA[i]-arrNumB[i])+",\n超过了最大误差:"+this.offsetNum);
     return false;
    };
  }
  alert("相似色\n"+sHexColorA+"\n"+sHexColorB)
  return true;
}
isSimilarColor("FFFFFF","F0FFFE",10);
</script>
</body>
</html>