基于Bootstrup的强大jQuery表单验证插件 The best jQuery plugin to validate form fields

Use error message that is returned from remote/callback validator

Username

The username is required and can't be emptyThe username is not valid

Email address

The email address is required and can't be emptyThe input is not a valid email addressPlease enter a valid value

Password

The password is required and can't be emptyThe password can't be the same as usernamePlease enter a valid value