golang http 请求添加拦截器

//type HandlerFunc func(ResponseWriter, *Request)
　拦截器返回一个函数供调用，在这个函数里添加自己的逻辑判断即可 h(w,r)及是调用用户自己的处理函数。h 是函数指针

func handleIterceptor(h http.HandlerFunc) http.HandlerFunc {
    return func(w http.ResponseWriter, r *http.Request) {
        fmt.Println("handleIterceptor")
        h(w, r)
    }
}

// /
func myhandler(writer http.ResponseWriter, request *http.Request) {
    fmt.Println("myhandler")
}

func web(writer http.ResponseWriter, request *http.Request) {
    fmt.Println("web")
}

func main() {
    http.HandleFunc("/", handleIterceptor(myhandler))
    http.HandleFunc("/web", handleIterceptor(web))
    http.ListenAndServe(":8080", nil)
}