Variable validator`Const`

validator: (schema: Record<string, ValidationRule>) => Middleware = validationAdapter

兼容原validator中间件的导出提供与原中间件完全相同的接口

Type Declaration

- (schema: Record<string, ValidationRule>): Middleware
- Validation插件的中间件适配器允许将validation插件作为中间件使用，兼容原validator中间件的接口支持字段验证、类型检查、格式验证等功能
  Parameters
  - schema: Record<string, ValidationRule>
    验证规则对象，键为字段名，值为验证规则
  Returns Middleware
  中间件函数
  Example
```
router.use(validator({
  username: {
    type: 'string',
    required: true,
    minLength: 3,
    maxLength: 20
  },
  age: {
    type: 'number',
    required: true,
    min: 18,
    max: 120
  }
}))
```