main.go

package main

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

func qiantao(w http.ResponseWriter, r *http.Request) {
	t , err := template.ParseFiles("./t.tmpl", "./ul.tmpl")
	if err != nil {
		fmt.Println("Parse template failured, err: %v\n", err)
	}
	name := "Golang"
	t.Execute(w, name)
}
func main() {
	http.HandleFunc("/", qiantao)
	err := http.ListenAndServe(":9000", nil)
	if err != nil {
		fmt.Println("Http server start failured, err:%v\n", err)
	}
}

t,tmpl

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<h1>嵌套template</h1>
    {{/* 嵌套了另外一个单独的模板 */}}
{{template "ul.tmpl"}}
<hr>
{{/*嵌套一个define定义的模板*/}}
{{template "ol.tmpl"}}
你好,{{ . }}
</body>
</html>
{{/* 通过define定义模板 */}}
{{define "ol.tmpl"}}
    <ol>444</ol>
    <ol>555</ol>
    <ol>666</ol>
{{end}}

ul.tmpl

<ul>
    <li>111</li>
    <li>222</li>
    <li>333</li>
</ul>