javascript IP、域名、手機號碼正則表達式驗證代碼

//ip與域名驗證函數
function checkIP()
{
    var ipArray,ip,j;
    ip = document.ipform.ip.value;

    if(/[A-Za-z_-]/.test(ip)){
        if (ip.indexOf(" ")>=0){
            ip = ip.replace(/ /g,"");
            document.ipform.ip.value = ip;
        }
        if (ip.toLowerCase().indexOf("http://")==0){
            ip = ip.slice(7);
            document.ipform.ip.value = ip;
        }
        if(!/^([\w-]+\.)+((com)|(net)|(org)|(gov\.cn)|(info)|(cc)|(com\.cn)|(net\.cn)|(org\.cn)|(name)|(biz)|(tv)|(cn)|(mobi)|(name)|(sh)|(ac)|(io)|(tw)|(com\.tw)|(hk)|(com\.hk)|(ws)|(travel)|(us)|(tm)|(la)|(me\.uk)|(org\.uk)|(ltd\.uk)|(plc\.uk)|(in)|(eu)|(it)|(jp))$/.test(ip)){
            alert("不是正確的域名");
            document.ipform.ip.focus();
            return false;
        }
    }
    else{
        ipArray = ip.split(".");
        j = ipArray.length
        if(j!=4)
        {
            alert("不是正確的IP");
            document.ipform.ip.focus();
            return false;
        }

        for(var i=0;i4;i++)
        {
            if(ipArray[i].length==0 || ipArray[i]>255)
            {
                alert("不是正確的IP");
                document.ipform.ip.focus();
                return false;
            }
        }
    }
}
//手機號碼驗證函數
function checkMobile(){
    var sMobile = document.mobileform.mobile.value
    if(!(/^1[3|4|5|8][0-9]\d{4,8}$/.test(sMobile))){
        alert("不是完整的11位手機號或者正確的手機號前七位");
        document.mobileform.mobile.focus();
        return false;
    }
}
//郵政編碼驗證函數
function checkZip(){
    var sZip = document.zipform.zip.value
    if(!(/^\d{4,6}$/.test(sZip))){
        alert("請輸入郵政編碼前4-6位");
        return false;
    }
}
//區(qū)號驗證
function checkZone(){
    var sZone = document.zoneform.zone.value
    if(!(/^0\d{2,6}$/.test(sZone))){
        alert("請輸入以“0”開頭的3-7位區(qū)號");
        return false;
    }
}
//身份證驗證
function checkID(){
    var sID = document.IDform.userid.value
    if(!(/^\d{15}$|^\d{18}$|^\d{17}[xX]$/.test(sID))){
        alert("請輸入15位或18位身份證號");
        document.IDform.userid.focus();
        return false;
    }