// check if a string is url format function isURL(url) { var strRegex = "^((https|http|ftp|rtsp|mms)://)" + "{1}(([0-9a-zA-Z_!~*'().&=+$%-]+: )?[0-9a-zA-Z_!~*'().&=+$%-]+@)?" //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-zA-Z_!~*'()-]+.)*" // 域名- www. + "([0-9a-zA-Z][0-9a-zA-Z-]{0,61})?[0-9a-zA-Z]." // 二级域名 + "[a-zA-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-zA-Z_!~*'().;?:@&=+$,%#-]+)+/?)$"; var re=new RegExp(strRegex); return re.test(url); }