Go嵌套模板路径作为变量

package main

import (
    "html/template"
    "net/http"
)

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

func handler(w http.ResponseWriter, r *http.Request) {
    tmpl, err := template.ParseFiles("templates/base.html", "templates/index.html")
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }

    data := struct {
        Title string
    }{
        Title: "Hello, World!",
    }

    err = tmpl.ExecuteTemplate(w, "base", data)
    if err != nil {
        http.Error(w, err.Error(), http.StatusInternalServerError)
        return
    }
}