url有效校验

/**
 * URL有效性校验
 * @param str_url
 * @returns {boolean}
 */
function isURL(str_url) { 
  // 验证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);
}
// 建议的正则
functionisURL(str) {
  return !! str.match(/(((^https?:(?:\/\/)?)(?:[-;:&=\+\$,\w]+@)?[A-Za-z0-9.-]+|(?:www.|[-;:&=\+\$,\w]+@)[A-Za-z0-9.-]+)((?:\/[\+~%\/.\w-_]*)?\??(?:[-\+=&;%@.\w_]*)#?(?:[\w]*))?)$/g);
}