表单验证插件，规则丰富。
引用代码
<script src="https://cdn.bootcdn.net/ajax/libs/jquery-validate/1.20.0/jquery.validate.min.js"></script>资源地址
https://cdn.bootcdn.net/ajax/libs/jquery-validate/1.20.0/jquery.validate.min.js
表单验证插件，规则丰富。
<script src="https://cdn.bootcdn.net/ajax/libs/jquery-validate/1.20.0/jquery.validate.min.js"></script>https://cdn.bootcdn.net/ajax/libs/jquery-validate/1.20.0/jquery.validate.min.js