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<html>
<head>
<title>策略模式-校验表单</title>
<meta content="text/html; charset=utf-8" http-equiv="Content-Type">
</head>
<body>
<form id = "registerForm" method="post" action="http://xxxx.com/api/register">
用户名：<input type="text" name="userName">
密码：<input type="text" name="password">
手机号码：<input type="text" name="phoneNumber">
<button type="submit">提交</button>
</form>
<script type="text/javascript">
// 策略对象
const strategies = {
isNoEmpty: function (value, errorMsg) {
if (value === '') {
return errorMsg;
}
},
isNoSpace: function (value, errorMsg) {
if (value.trim() === '') {
return errorMsg;
}
},
minLength: function (value, length, errorMsg) {
if (value.trim().length < length) {
return errorMsg;
}
},
maxLength: function (value, length, errorMsg) {
if (value.length > length) {
return errorMsg;
}
},
isMobile: function (value, errorMsg) {
if (!/^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|17[7]|18[0|1|2|3|5|6|7|8|9])\d{8}$/.test(value)) {
return errorMsg;
}
}
}
// 验证类
class Validator {
constructor() {
this.cache = []
}
add(dom, rules) {
for(let i = 0, rule; rule = rules[i++];) {
let strategyAry = rule.strategy.split(':')
let errorMsg = rule.errorMsg
this.cache.push(() => {
let strategy = strategyAry.shift()
strategyAry.unshift(dom.value)
strategyAry.push(errorMsg)
return strategies[strategy].apply(dom, strategyAry)
})
}
}
start() {
for(let i = 0, validatorFunc; validatorFunc = this.cache[i++];) {
let errorMsg = validatorFunc()
if (errorMsg) {
return errorMsg
}
}
}
}
// 调用代码
let registerForm = document.getElementById('registerForm')
let validataFunc = function() {
let validator = new Validator()
validator.add(registerForm.userName, [{
strategy: 'isNoEmpty',
errorMsg: '用户名不可为空'
}, {
strategy: 'isNoSpace',
errorMsg: '不允许以空白字符命名'
}, {
strategy: 'minLength:2',
errorMsg: '用户名长度不能小于2位'
}])
validator.add(registerForm.password, [ {
strategy: 'minLength:6',
errorMsg: '密码长度不能小于6位'
}])
validator.add(registerForm.phoneNumber, [{
strategy: 'isMobile',
errorMsg: '请输入正确的手机号码格式'
}])
return validator.start()
}
registerForm.onsubmit = function() {
let errorMsg = validataFunc()
if (errorMsg) {
alert(errorMsg)
return false
}
}
</script>
</body>
</html>
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缺点
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