form表单input输入框，自己修改输入限制（在不改变iview源码的基础上）
<Form-item :label="nameLabel" required prop="user.name" :rules="validator">
<Input required v-model="name"></Input>
</Form-item>
validator: [
{
validator: (rule, value, callback) => {
callback('根据判断，写具体的提示！')
}
}
]
