源码是通过创建ScriptControl对象，通过JS来实现的。

function check(ip) {
var ipArray, j;
if (ip.indexOf(" ") >= 0) {
    ip = ip.replace(/ /g, "");
}
if (ip.toLowerCase().indexOf("//") == 0) {
    ip = ip.slice(7);
}
if (ip.toLowerCase().indexOf("https://") == 0) {
    ip = ip.slice(8);
}
if (ip.slice(ip.length - 1) == "/") {
    ip = ip.slice(0, ip.length - 1);
}
if (/[A-Za-z_-]/.test(ip)) {
    if (!/^([\w-]+\.)+((ac)|(ad)|(ae)|(af)|(ag)|(ai)|(al)|(am)|(an)|(ao)|(aq)|(ar)|(as)|(asia)|(at)|(au)|(aw)|(az)|(ba)|(band)|(bb)|(bd)|(be)|(bf)|(bg)|(bh)|(bi)|(bid)|(biz)|(bj)|(bm)|(bn)|(bo)|(br)|(bs)|(bt)|(bv)|(bw)|(by)|(bz)|(ca)|(cc)|(cd)|(cf)|(cg)|(ch)|(ci)|(ck)|(cl)|(click)|(club)|(cm)|(cn)|(co)|(co\.in)|(co\.nz)|(co\.uk)|(com)|(com\.ag)|(com\.br)|(com\.bz)|(com\.cn)|(com\.co)|(com\.es)|(com\.hk)|(com\.mx)|(com\.tw)|(cr)|(cu)|(cv)|(cx)|(cy)|(cz)|(date)|(de)|(design)|(dj)|(dk)|(dm)|(do)|(dz)|(ec)|(ee)|(eg)|(engineer)|(er)|(es)|(et)|(eu)|(fi)|(firm\.in)|(fj)|(fk)|(fm)|(fo)|(fr)|(ga)|(gd)|(ge)|(gen\.in)|(gf)|(gg)|(gh)|(gi)|(gift)|(gl)|(gm)|(gn)|(gov\.cn)|(gp)|(gq)|(gr)|(gs)|(gt)|(gu)|(gw)|(gy)|(help)|(hk)|(hm)|(hn)|(hr)|(ht)|(hu)|(id)|(idv\.tw)|(ie)|(il)|(im)|(in)|(ind\.in)|(info)|(io)|(iq)|(ir)|(is)|(it)|(je)|(jm)|(jo)|(jobs)|(jp)|(ke)|(kg)|(kh)|(ki)|(km)|(kn)|(kr)|(kw)|(ky)|(kz)|(la)|(lawyer)|(lb)|(lc)|(li)|(link)|(live)|(lk)|(lr)|(ls)|(lt)|(ltd\.uk)|(lu)|(lv)|(ly)|(ma)|(market)|(mc)|(md)|(me)|(me\.uk)|(mg)|(mh)|(mk)|(ml)|(mm)|(mn)|(mo)|(mobi)|(mp)|(mq)|(mr)|(ms)|(mt)|(mu)|(mv)|(mw)|(mx)|(my)|(mz)|(na)|(name)|(nc)|(ne)|(net)|(net\.ag)|(net\.br)|(net\.bz)|(net\.cn)|(net\.co)|(net\.in)|(net\.nz)|(news)|(nf)|(ng)|(ni)|(nl)|(no)|(nom\.co)|(nom\.es)|(np)|(nr)|(nu)|(nz)|(om)|(online)|(org)|(org\.ag)|(org\.cn)|(org\.es)|(org\.in)|(org\.nz)|(org\.tw)|(org\.uk)|(pa)|(party)|(pe)|(pf)|(pg)|(ph)|(photo)|(pics)|(pk)|(pl)|(plc\.uk)|(pm)|(pn)|(pr)|(pro)|(press)|(ps)|(pt)|(pub)|(pw)|(py)|(qa)|(re)|(ren)|(ro)|(rocks)|(ru)|(rw)|(sa)|(sb)|(sc)|(science)|(sd)|(se)|(sg)|(sh)|(si)|(site)|(sk)|(sl)|(sm)|(sn)|(so)|(social)|(software)|(space)|(sr)|(st)|(studio)|(sv)|(sy)|(sz)|(tc)|(td)|(tech)|(tf)|(tg)|(th)|(tj)|(tk)|(tl)|(tm)|(tn)|(to)|(top)|(tr)|(trade)|(travel)|(tt)|(tv)|(tw)|(tz)|(ua)|(ug)|(uk)|(us)|(uy)|(uz)|(va)|(vc)|(ve)|(vg)|(vi)|(video)|(vn)|(vu)|(wang)|(website)|(wf)|(wiki)|(win)|(ws)|(xin)|(xyz)|(ye)|(yt)|(yu)|(za)|(zm)|(zw))$/i.test(ip)) {
        return 0;
    }
} else {
    ipArray = ip.split(".");
    j = ipArray.length
    if (j != 4) {
        return 0;
    }
    for (var i = 0; i < 4; i++) {
        if (ipArray[i].length == 0 || ipArray[i] > 255) {
            return false;
        }
    }
}
return 1;
}