域名格式验证

 一段网上找的域名验证 js 收藏下

function checkDomain(nname)
{
    if(nname.indexOf(" www.")==0)
        return false;
    var arr = new Array(
        '.com','.net','.org','.biz','.coop','.info','.museum','.name',
        '.pro','.edu','.gov','.int','.mil','.ac','.ad','.ae','.af','.ag',
        '.ai','.al','.am','.an','.ao','.aq','.ar','.as','.at','.au','.aw',
        '.az','.ba','.bb','.bd','.be','.bf','.bg','.bh','.bi','.bj','.bm',
        '.bn','.bo','.br','.bs','.bt','.bv','.bw','.by','.bz','.ca','.cc',
        '.cd','.cf','.cg','.ch','.ci','.ck','.cl','.cm','.cn','.co','.cr',
        '.cu','.cv','.cx','.cy','.cz','.de','.dj','.dk','.dm','.do','.dz',
        '.ec','.ee','.eg','.eh','.er','.es','.et','.fi','.fj','.fk','.fm',
        '.fo','.fr','.ga','.gd','.ge','.gf','.gg','.gh','.gi','.gl','.gm',
        '.gn','.gp','.gq','.gr','.gs','.gt','.gu','.gv','.gy','.hk','.hm',
        '.hn','.hr','.ht','.hu','.id','.ie','.il','.im','.in','.io','.iq',
        '.ir','.is','.it','.je','.jm','.jo','.jp','.ke','.kg','.kh','.ki',
        '.km','.kn','.kp','.kr','.kw','.ky','.kz','.la','.lb','.lc','.li',
        '.lk','.lr','.ls','.lt','.lu','.lv','.ly','.ma','.mc','.md','.mg',
        '.mh','.mk','.ml','.mm','.mn','.mo','.mp','.mq','.mr','.ms','.mt',
        '.mu','.mv','.mw','.mx','.my','.mz','.na','.nc','.ne','.nf','.ng',
        '.ni','.nl','.no','.np','.nr','.nu','.nz','.om','.pa','.pe','.pf',
        '.pg','.ph','.pk','.pl','.pm','.pn','.pr','.ps','.pt','.pw','.py',
        '.qa','.re','.ro','.rw','.ru','.sa','.sb','.sc','.sd','.se','.sg',
        '.sh','.si','.sj','.sk','.sl','.sm','.sn','.so','.sr','.st','.sv',
        '.sy','.sz','.tc','.td','.tf','.tg','.th','.tj','.tk','.tm','.tn',
        '.to','.tp','.tr','.tt','.tv','.tw','.tz','.ua','.ug','.uk','.um',
        '.us','.uy','.uz','.va','.vc','.ve','.vg','.vi','.vn','.vu','.ws',
        '.wf','.ye','.yt','.yu','.za','.zm','.zw'); 
        var mai = nname;
        var val = true;
    
        
            var dot = mai.lastIndexOf(".");
        var dname = mai.substring(0,dot);
        var ext = mai.substring(dot,mai.length);
        //alert(ext);
         
        if(dot>2 && dot<57)
        {
         for(var i=0; i<arr.length; i++)
         {
           if(ext == arr[i])
           {
           val = true;
          break;
           } 
           else
           {
           val = false;
           }
         }
         if(val == false)
         { 
           return false;
         }
         else
         {
          for(var j=0; j<dname.length; j++)
          {
            var dh = dname.charAt(j);
            var hh = dh.charCodeAt(0);
            if((hh > 47 && hh<59) || (hh > 64 && hh<91) || (hh > 96 && hh<123) || hh==45 || hh==46)
            {
            if((j==0 || j==dname.length-1) && hh == 45) 
              { 
                 return false;
             }
            }
          else { 
            return false;
            }
          }
         }
        }
        else
        { 
         return false;
        } 
        
        return true;
        }