function subTest(){

var number = document.testForm.number.value;
var name = document.testForm.userName.value;
var pass = document.testForm.userPassword.value;
var rePass = document.testForm.reUserPassword.value;

if(number.length > 20 || number.length < 4){
        alert("學號長度必須大于等于4,小于等于20");
        testForm.number.focus();
        return false;
}else if(isSpaceN()){
    alert("學號只能包含數字");
    testForm.number.focus();
        return false;
}

else if(name.length > 16 || name.length < 2){
        alert("用戶名長度必須大于等于2,小于等于16");
        testForm.userName.focus();
        return false;
}else if(isFirst()){
    alert("用戶名頭字母不能為數字");
    testForm.userName.focus();
    return false;
}
else if(pass.length < 1){
    alert("請輸入密碼");
    testForm.userPassword.focus();
    return false;
}else if(pass != rePass){
    alert("兩次密碼輸入不相符合!");
    testForm.reUserPassword.focus();
    return false;
}
    return true;
}

function isSpace(){

    var name = document.testForm.userName.value.split("");
    
    for(i = 0; i < name.length; i++){
        if(name[i] == " "){
            return true;
        }else if( !((name[i] < "z" && name[i] > "a") || (name[i] < "Z" && name[i] > "A") 
        || name[i] == "-" || name[i] == "_" || (name[i] < "9" && name[i] > "0"))){
            return true;
        }        
    }
    return false;
}




function isFirst(){
    var name = document.testForm.userName.value.split("");
    if(name[0] < "9" && name[0] > "0"){
        return true;
    }
    return false;
}

function isSpaceN(){

    var number = document.testForm.number.value.split("");
    
    for(i = 0; i < number.length; i++){
        if((number[i] > "9" || number[i] < "0")){
            return true;
        }        
    }
    return false;
}