策略模式的表單驗證

/* *策略模式的表單驗證 */ /**************策略對象******************/ var strategies = {     isNonEmpty: function(value, errorMsg) {         if (value === '') {             return errorMsg;         };     },     minLength: function(value, length, errorMsg) {         if (value.length < length) {             return errorMsg;         };     },     isMobile: function(value, errorMsg) {         if (!/(^1[3|4|5|7|8][0-9]{9}$)/.test(value)) {             return errorMsg;         };     } }; /**************Validator 類******************/ var Validator = function() {     this.cache = []; }; 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 strategies[strategy].apply(dom, strategyAry);             })         })(rule)     }; }; Validator.prototype.start = function() {     for (var i = 0, validatorFuc; validatorFuc = this.cache[i++];) {         var errorMsg = validatorFuc();         if (errorMsg) {             return errorMsg;         };     }; }; /**************客戶端調用代碼******************/ var loginForm = document.getElementById('J_login'); var validataFuc = function() {     var validator = new Validator();     validator.add(loginForm.uesrname, [{         strategy: 'isNonEmpty',         errorMsg: '用戶名不能爲空'     },{          strategy: 'isMobile',         errorMsg: '手機號碼格式不對'     }]);     validator.add(loginForm.password, [{         strategy: 'isNonEmpty',         errorMsg: '密碼不能爲空'     }, {         strategy: 'minLength:6',         errorMsg: '密碼長度不能小余6位'     }]);     var errorMsg = validator.start();     return errorMsg; } loginForm .onsubmit = function() {     var errorMsg = validataFuc();     if (errorMsg) {         alert(errorMsg);         return false;     }; };