可选校验规则

示例1，空字符串

示例2，空指针属性

package main
import (
    "fmt"
    "github.com/gogf/gf/v2/container/gvar"
    "github.com/gogf/gf/v2/frame/g"
    "github.com/gogf/gf/v2/os/gctx"
)
func main() {
        Page      int       `v:"required|min:1         # page is required"`
        Size      int       `v:"required|between:1,100 # size is required"`
        ProjectId *gvar.Var `v:"between:1,10000        # project id must between {min}, {max}"`
    }
    var (
        ctx = gctx.New()
        obj = &Params{
            Page: 1,
            Size: 10,
        }
    err := g.Validator().Data(obj).Run(ctx)  
    fmt.Println(err)
    // Output:
    // <nil>
}

示例3，空整型属性

project id must between 1, 10000

示例4，通过map传参

{
    "password": {
        "same": "The password value `123456` must be the same as field password2",
}