//驗證郵箱:
function ss(){
    var isEmail1 = /^\w+([\.\-]\w+)*\@\w+([\.\-]\w+)*\.\w+$/;
    var isEmail2 = /^.*@[^_]*$/;
    var addr = document.getElementById("tt").value;

 if (!isEmail1.test(addr) || !isEmail2.test(addr)){
  alert("fail");
 }else{
  alert("success");
 }
}

<input type=text id=tt>
<input type=button value=checkit onclick="ss()">

//驗證身份證，包括18位，最后一個是X的
 //身份證驗證函數
   function isIdCardNo(obj)
{
    var powers=new Array("7","9","10","5","8","4","2","1","6","3","7","9","10","5","8","4","2");
    var parityBit=new Array("1","0","X","9","8","7","6","5","4","3","2");
    var sex="1";
 
    var _id=obj;
    //alert(_id);
    if(_id=="") return false;
    var _valid=false;
 
    //-------------------------------
    //校驗18位的身份證號碼
    if(_id.length==18){
        _id=_id+"";
        var _num=_id.substr(0,17);
        var _parityBit=_id.substr(17);
        var _power=0;
        for(var i=0;i< 17;i++){
            //校驗每一位的合法性
            if(_num.charAt(i)<'0'||_num.charAt(i)>'9'){
                return false;
                break;
            }else{
                //加權
                _power+=parseInt(_num.charAt(i))*parseInt(powers[i]);
                //設置性別
                if(i==16&&parseInt(_num.charAt(i))%2==0)
                    sex="0";
                else
                    sex="1";
            }
        }
        //取模
        var mod=parseInt(_power)%11;
        if(parityBit[mod]==_parityBit)
            return true;
        else
            return false;
    }else{
        //-------------------------------
        //校驗15位的身份證號碼
        _id=_id+"";
        for(var i=0;i<_id.length;i++){
            //校驗每一位的合法性
            if(_id.charAt(i)<'0'||_id.charAt(i)>'9'){
                return false;
                break;
            }
        }
        var year=_id.substr(6,2);
        var month=_id.substr(8,2);
        var day=_id.substr(10,2);
        var sexBit=_id.substr(14);
        //校驗年份位
        if(year<'01'||year >'90') return false;
        //校驗月份
        if(month<'01'||month >'12') return false;
        //校驗日
        if(day<'01'||day >'31') return false;
        //設置性別
        if(sexBit%2==0)
            sex="0";
        else
            sex="1";
        return true;
    }
}

//驗證是否包含字母的

function check()
{
    var reg=/[A-Za-z]+/g;
    var input=document.getElementById("txt").value;
    var m=reg.test(input)
    if(m==false)alert("OK");
    if(m==true)alert("不能有字母");
}