// 策略物件
var strategys = {
    isNotEmpty: function(value,errorMsg) {
        if(value === '') {
            return errorMsg;
        }
    },
    // 限制最小長度
    minLength: function(value,length,errorMsg) {
        if(value.length < length) {
            return errorMsg;
        }
    },
    
 
// 手機號碼格式
    mobileFormat: function(value,errorMsg) {
        if(!/(^1[3|5|8][0-9]{9}$)/.test(value)) {
            return errorMsg;
        }
    } 
};
var Validator = function(){
    this.cache = [];  // 儲存效驗規則
};
Validator.prototype.add = function(dom,rules) {
    var self = this;
    for(var
 
 i = 0, rule; rule = rules[i++]; ){
        (function(rule){
            var strategyAry = rule.strategy.split(":");
            var errorMsg = rule.errorMsg;
            self.cache.push(function(){
                var strategy = strategyAry.shift();
                strategyAry.unshift(dom.value);
                strategyAry.push(errorMsg);
                
 
return strategys[strategy].apply(dom,strategyAry);
            });
        })(rule);
    }
};
Validator.prototype.start = function(){
    for(var i = 0, validatorFunc; validatorFunc = this.cache[i++]; ) {
    var msg = validatorFunc(); // 開始效驗 並取得效驗後的返回資訊
    if(msg) {
        return msg;
    }
    }
};
// 程式碼呼叫
var registerForm = document.getElementById("registerForm");
var validateFunc = function(){
    var validator = new Validator(); // 建立一個Validator物件
    /* 新增一些效驗規則 */
    validator.add(registerForm.userName,[
        {strategy: 'isNotEmpty',errorMsg:'使用者名稱不能為空'},
        {strategy: 'minLength:6',errorMsg:'使用者名稱長度不能小於6位'}
    ]);
    validator.add(registerForm.password,[
        {strategy: 'minLength:6',errorMsg:'密碼長度不能小於6位'},
    ]);
    validator.add(registerForm.phoneNumber,[
        {strategy: 'mobileFormat',errorMsg:'手機號格式不正確'},
    ]);
    var errorMsg = validator.start(); // 獲得效驗結果
    return errorMsg; // 返回效驗結果
};
// 點選確定提交
registerForm.onsubmit = function(){
    var errorMsg = validateFunc();
    if(errorMsg){
        alert(errorMsg);
        return false;
    }
}