校验链接

   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- www.
                + "([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_!~*'().;?:@&=+$,%#-]+)+/?)$";