Js URl检测方法(javascript)

//URl检测方法********************************************************
_CheckObjFunc.IsURL= function (str_url){
    var strRegex = "^((https|http|ftp|rtsp|mms)?://)"
    + "?(([0-9a-z_!~*'().&=+$%-]+: )?[0-9a-z_!~*'().&=+$%-]+@)?" //ftp的user@
          + "(([0-9]{1,3}\.){3}[0-9]{1,3}" // IP形式的URL- 199.194.52.184
          + "|" // 允许IP和DOMAIN（域名）
          + "([0-9a-z_!~*'()-]+\.)*" // 域名 http://www.my400800.cn
          + "([0-9a-z][0-9a-z-]{0,61})?[0-9a-z]\." // 二级域名
          + "[a-z]{2,6})" // first level domain- .com or .museum
          + "(:[0-9]{1,4})?" // 端口- :80
          + "((/?)|" // a slash isn't required if there is no file name
          + "(/[0-9a-z_!~*'().;?:@&=+$,%#-]+)+/?)$";
          var re=new RegExp(strRegex);
          if (re.test(str_url)){
              return (true);
          }else{
              return (false);
          }
      }