js 判断url格式

function IsURL (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- 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_!~*\'().;?:@&=+$,%#-]+)+/?)$'; 
    var re=new RegExp(strRegex); 
    return re.test(str_url);
}

function IsURL (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- 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-zA-Z_!~*\'().;?:@&=+$,%#-]+)+/?)$'; 
    var re=new RegExp(strRegex); 
    return re.test(str_url);
}