// 檢查是否為數字
function checkIsInteger(str){
        if (str == ""){
         return false;
        }
        if (str.search(/^[0-9]+$/) < 0){
         return false;
        }
        else{
         return true;
        }
}

//檢查是否整數
function CheckNum(str){
        if(!str || isNaN(str)){
         return false
 
;
        }
        str=(str * 1).toString();
        if(str.indexOf(".") == -1){
         return false;
        }
        return true;
}

// 檢查是否為有效的密碼，密碼只允許由ascii組成，此函數只在修改或註冊密碼時使用
function checkValidPasswd(str){
        var reg = /^[x00-x7f]+$/;
        if (! reg.test(str)){
         return false;
        }
        
 
if (str.length < 6 || str.length > 16){
         return false;
        }
        return true;
}

// 檢查是否為中文
function isChn(str){
        var reg = /^[u4E00-u9FA5]+$/;
        if(!reg.test(str)){
         return false;
        }
        return true;
}

// 檢查是否為有效的真實姓名，只能含有中文或大寫的英文字母
function isValidTrueName(strName){
        
 
var str = Trim(strName);   //判斷是否為全英文大寫或全中文，可以包含空格
        var reg = /^[A-Z u4E00-u9FA5]+$/;
        if(reg.test(str)){
         return false;
        }
        return true;
}

//檢查郵箱
function isEmail(str){
        var reg = /^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+((\.[a-zA-Z0-9_-]{2,3}){1,2})$/;
        return reg.test(str);
}

//檢查電話號碼
function isTel(str){
        var reg=/^([0-9]|[\-])+$/g ;
        if(str.length<7 || str.length>18){
         return false;
        }
        else{
          return reg.exec(str);
        }
}

//檢查年齡
function isAge(str){
        var mydate=new Date;
        var now=mydate.getFullYear();
        if (str < now-60 || str > now-18){
         return false;
        }
        return true;
}

//是否為合法的日期格式:YYYY-MM-DD
function isDateFormat(txt){
        if(txt==null || txt == ""){return false;}
        else{
         var regex = /[0-9]{1,4}-[0-9]{1,2}-[0-9]{1,2}/;
         if( regex.test(txt) ){
          var noArr = txt.split("-");
          var year = eval(noArr[0]);
          var month = eval(noArr[1]);
          var day = eval(noArr[2]);
          if ( year < 1 || month < 1 || month > 12 || day < 1 || day > 31) {return false;}
          if ((month == 4 || month == 6 || month == 9 || month == 11) && day > 30){return false;}
          if (month == 2){
           if ((year % 4 != 0) && day > 29) { return false;}
           if (year % 4 == 0){
            if(year % 100 == 0 && year % 400 != 0 && day > 29){return false;}
            else if (day > 28){
             return false;
            }
           }
          }
          return false;
         }
         else{
          return true;
         }
        }
}

//檢測15位或18位的身份證號
function isIdCardNum(txt){
        if(txt == null || txt == ""){
         return false;
        }
        var idNo = txt.toString();
        var len = idNo.length;
        var reg;
        var noArr;
        var dateStr="";
        if(len != 15 && len != 18){
         return false;
        }
        else if(len == 15){
         reg = /(\d{3})(\d{3})(\d{2})(\d{2})(\d{2})(\d{3})/;
         if(reg.test(idNo)==false){
          return false;
         }
         else{
          noArr = reg.exec(idNo);
          dateStr = "19"+noArr[3]+"-"+noArr[4]+"-"+noArr[5];
          return isDateFormat(dateStr);
         }
        }
        else{
         reg = /(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})(\d{1})([0-9xX]{1})/;
         if(reg.test(idNo)==false){
          return false;
         }
         else{
          noArr = reg.exec(idNo);
          dateStr = noArr[7]+noArr[8]+noArr[9]+noArr[10]+"/"+noArr[11]+noArr[12]+"/"+noArr[13]+noArr[14];
          if(isNaN(new Date(dateStr)) == false){
           var wi = new Array(0,7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2);
           var amt = 0;
           var i;
           var chkNo = new Array("1","0","X","9","8","7","6","5","4","3","2");
           for(i=1;i<18;i++){
            amt += (noArr[i]*wi[i]);
           }
           return (chkNo[amt % 11] == noArr[18].toUpperCase());
          }
          else{
           return false;
          }
         }
        }
}

JS表單驗證