策略模式下表單驗證

策略模式下表單驗證

class Validator {
	constructor(strategies) {
		this.cache = []
	}
	add(value, rules) {
		if (!rules instanceof Array) throw 'rules should be Array'
		var self = this
		for(var i = 0, rule; rule = rules[i++];) {
    		(function(rule) {
    			var strategyArr = rule.strategy.split(':')
    			var errorMsg = rule.errorMsg
    			self.cache.push(function() {
    				var strategy = strategyArr.shift();
    				strategyArr.unshift(value)
    				strategyArr.push(errorMsg)
    				return strategies[strategy].apply(null, strategyArr)
    			})
    		})(rule)
		}
	}
	start() {
		for (var i = 0, fn; fn = this.cache[i++]; ) {
			var errorMsg = fn()
			if (errorMsg) {
				return errorMsg
			}
		}
	}
}
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